Chest Injury
Chest injury is trauma to the thoracic wall or intrathoracic structures—including the lungs, heart, great vessels, and airway—caused by blunt or penetrating forces, potentially compromising ventilation, oxygenation, and circulatory function.
Chest Injury
Chest injury (thoracic trauma) refers to any trauma to the chest wall, pleural space, lungs, tracheobronchial tree, heart, great vessels, oesophagus, or diaphragm resulting from external mechanical forces. It encompasses a spectrum from isolated rib fractures to immediately life-threatening conditions such as tension pneumothorax, massive haemothorax, and cardiac tamponade.
The word "thorax" comes from the Greek thorax = breastplate/chest. Trauma to this region is particularly dangerous because the thorax houses two critical organ systems — the respiratory system (gas exchange) and the cardiovascular system (circulation). Any disruption to either can be rapidly fatal.
Chest trauma accounts for ~25% of all trauma deaths and is a contributing factor in another ~25% [1]. It is the second most common cause of trauma death after head injury.
Key Concept
Most life-threatening chest injuries can be diagnosed clinically and managed with relatively simple procedures (e.g., chest decompression, chest drain). Only ~10-15% of chest injuries require formal thoracotomy. This is why the ATLS primary survey approach is so critical — you can save lives with a needle, a tube, and clinical acumen.
2. Epidemiology and Risk Factors
- Global: Trauma is the leading cause of death in people < 40 years old [2][3]. Road traffic accidents (RTAs) account for ~50% of trauma deaths, followed by homicides (~20%), suicides (~15%), falls (~10%), and burns (~5%) [3].
- Hong Kong context: RTAs remain the predominant mechanism. Hong Kong's dense urban environment, heavy traffic, and high-rise buildings contribute to both vehicular trauma and falls from height. Interpersonal violence (gang fights with chopping/stabbing wounds) is also a significant mechanism, particularly in certain districts [1].
- Chest injuries occur in ~50% of multiply-injured patients.
- Blunt chest trauma accounts for >80% of thoracic injuries in civilian settings (most commonly RTAs, falls). Penetrating chest trauma (stab wounds, gunshot wounds) is less common in Hong Kong compared to Western countries but still significant in the context of interpersonal violence [1].
| Risk Factor | Mechanism / Explanation |
|---|---|
| Young males (15-44 years) | Risk-taking behaviour, occupational exposure, interpersonal violence |
| RTAs (no seatbelt, high speed) | Deceleration injury → aortic shear at isthmus; steering wheel impact → sternal/rib fractures, cardiac contusion |
| Falls from height | Common in Hong Kong (high-rise buildings, construction); axial loading + lateral impact |
| Interpersonal violence | Stab wounds, chopping wounds — common in gang fights; penetrating mechanism [1] |
| Elderly / osteoporosis | Lower-energy mechanisms can cause rib fractures; reduced respiratory reserve → complications |
| Pre-existing lung disease (COPD, TB) | Less respiratory reserve → even minor injuries can precipitate respiratory failure |
| Alcohol / drug intoxication | Impaired protective reflexes, delayed presentation, aspiration risk |
| Occupational hazards | Construction workers (falls, crush injuries), industrial explosions (blast injury) |
3. Anatomy and Function — Why Chest Injury Matters
Understanding the anatomy is essential because the type and location of injury directly predicts the clinical consequences.
- Ribs: 12 pairs. The 4th–10th ribs are most commonly fractured [3]. The upper ribs (1st–3rd) are protected by the scapula, clavicle, and thick muscles — fracture of these ribs implies high-energy trauma and should alert you to mediastinal/great vessel injury [3]. The lower ribs (10th–12th) overlie the spleen (left) and liver (right) — fractures here suggest intra-abdominal organ injury [3].
- Sternum: Sternal fractures suggest significant anterior force (e.g., steering wheel, seatbelt) and should prompt evaluation for myocardial contusion.
- Intercostal neurovascular bundle: Runs along the inferior border of each rib (vein-artery-nerve, from top to bottom). This is why chest drains are inserted just above the rib to avoid the bundle, and why rib fractures can cause significant bleeding.
- Muscles: Intercostals (external, internal, innermost), diaphragm. The diaphragm is the primary muscle of respiration — rupture causes herniation of abdominal contents into the thorax.
- A potential space between the visceral pleura (adherent to lung) and parietal pleura (lines chest wall). Normally contains only a thin film of serous fluid (~5-15 mL) for lubrication.
- Why does air in the pleural space collapse the lung? Because the lung has intrinsic elastic recoil pulling it inward, while the chest wall has elastic recoil pulling it outward. The negative intrapleural pressure (~-5 cmH₂O at rest) keeps the lung expanded. If air enters (pneumothorax), pressure equalises → lung collapses.
- Why does tension pneumothorax cause shock? A one-way valve mechanism allows air in but not out → progressive positive pressure → mediastinal shift → compression of the contralateral lung AND kinking of the great veins (SVC/IVC) → decreased venous return → obstructive shock [4][5].
- Right lung: 3 lobes; Left lung: 2 lobes (cardiac notch).
- Lung parenchyma is highly vascular — contusion causes bleeding into airways → appears as consolidation on CXR [3].
- The tracheobronchial tree can rupture with severe deceleration or crush injury → pneumomediastinum, persistent air leak.
- Anterior: thymus, internal mammary vessels.
- Middle: heart, pericardium, great vessels (aorta, SVC, IVC, pulmonary arteries/veins), trachea, main bronchi, oesophagus, phrenic/vagus nerves.
- Posterior: descending aorta, oesophagus, thoracic duct, azygos vein, thoracic vertebral bodies.
- The aortic isthmus (junction of the mobile aortic arch and the fixed descending aorta, just distal to the left subclavian artery) is the most vulnerable point for deceleration injury — this is where 80-85% of traumatic aortic injuries occur [3]. Think of it like holding a rope at one end and whipping it — the point of fixation takes the maximum shear force.
- The pericardium is a fibrous sac containing 15-50 mL of fluid [6]. It is relatively non-distensible in the acute setting.
- Why does a small pericardial effusion cause tamponade in trauma but not in chronic effusions? Because in chronic effusions (e.g., malignancy), the pericardium stretches gradually and can accommodate up to 1-2L. In acute trauma, even 100-200 mL of blood can dramatically increase intrapericardial pressure → compress the chambers (especially the thin-walled right atrium/ventricle) → impair diastolic filling → decreased cardiac output → obstructive shock (Beck's triad: hypotension, distended neck veins, muffled heart sounds) [1].
- A dome-shaped musculotendinous sheet separating the thorax from the abdomen.
- Rupture is more common on the left (because the liver provides a protective buttress on the right) [3].
- Rupture allows abdominal viscera (stomach, colon, spleen) to herniate into the thorax → compresses lung, may strangulate herniated viscera.
- Posterior mediastinal structure, has no serosa → inherently more susceptible to perforation and poor healing [7].
- Rupture → contamination of mediastinum with gastric contents and bacteria → mediastinitis (a surgical emergency with high mortality).
4. Etiology (Mechanisms of Injury)
The mechanism of injury determines the pattern of injuries you expect — always elicit a detailed mechanism in the history [1][2].
Classification of injuries [1]:
| Mechanism | Description | Common Chest Injuries |
|---|---|---|
| Blunt injury | Impact without penetration of body surface (RTAs, falls, assaults, crush) | Rib fractures, flail chest, pulmonary contusion, pneumothorax, haemothorax, cardiac contusion, aortic injury, diaphragmatic rupture, tracheobronchial injury |
| Penetrating injury | Object breaches body surface (stab wounds, chopping wounds, gunshot wounds) [1] | Open pneumothorax, haemothorax, cardiac tamponade, vascular injury, oesophageal perforation |
| Blast injury | Explosion generating a pressure wave | Primary: barotrauma (blast lung, tympanic membrane rupture); Secondary: penetrating fragments; Tertiary: blunt from being thrown; Quaternary: burns, inhalation |
| Iatrogenic | Medical procedures | CVC insertion → pneumothorax; OGD → oesophageal perforation; mechanical ventilation → barotrauma |
Blunt injury is the most common mechanism in Hong Kong [1][2].
-
Direct impact (compression): The chest wall is compressed between the impacting force and the spine/posterior chest wall. This directly fractures ribs, compresses the heart (cardiac contusion), and can rupture the lung parenchyma (contusion). Example: steering wheel impact, fall onto chest.
-
Deceleration (shearing): When the body rapidly decelerates (e.g., high-speed RTA, fall from height), structures of different densities or those tethered at different points experience shear forces at their points of attachment. This is the mechanism behind:
- Aortic injury at the isthmus: The relatively mobile aortic arch shears against the fixed descending aorta [3].
- Tracheobronchial injury at the carina.
- Mesenteric tears (abdominal).
-
Blast/overpressure: A pressure wave travels through tissues. Air-containing organs (lungs, bowel, middle ear) are most susceptible because of the air-tissue interface. The pressure wave causes disruption at these interfaces → blast lung (haemorrhagic alveolitis, pulmonary contusion).
Penetrating injury [1]:
- Stab wounds: Low-velocity, localised damage along the tract of the weapon. The injury is predictable based on the weapon trajectory and depth of penetration. In gang fights, chopping and stabbing wounds are common [1].
- Gunshot wounds: Higher velocity → greater energy transfer → more tissue destruction. The injury zone extends beyond the wound tract (cavitation effect). The path may be unpredictable (bullet tumbling, fragmentation, ricocheting off bone).
Clinical Pearl - Penetrating Chest Trauma
Any penetrating wound between the nipples anteriorly, the scapula tips posteriorly, and the clavicles superiorly should be assumed to involve the heart, great vessels, or mediastinum until proven otherwise [1]. This is the "cardiac box" or "zone of danger."
- RTAs: The most common mechanism. A bus hit a train scenario represents a mass casualty incident (MCI) / disaster [2], requiring triage and disaster management protocols.
- Falls from height: Very common due to construction and high-rise buildings. Vertical deceleration → bilateral calcaneal fractures, spinal fractures, and thoracic/abdominal injuries.
- Gang fights: Chopped and stabbed wounds are a recognised pattern of interpersonal violence in Hong Kong [1]. These present with nerve and vascular injuries as well as chest/abdominal penetration.
- Burns/scalds: Scalds can affect the chest wall and airway [8]. Circumferential chest burns can cause a restrictive physiology requiring escharotomy.
- Industrial/construction injuries: Crush injuries, falls from scaffolding.
5. Classification of Chest Injuries
5.1 By Timing of Life-Threat (ATLS Classification)
This is the most clinically useful classification. The ATLS approach divides chest injuries into those identified during the primary survey (immediately life-threatening) and those identified during the secondary survey (potentially life-threatening).
These 6 conditions must be identified and treated during the primary survey. They will kill the patient within minutes if not addressed.
| Condition | Mnemonic Letter | Key Feature |
|---|---|---|
| Airway obstruction | A | Stridor, inability to ventilate |
| Tension pneumothorax | T | Obstructive shock + absent breath sounds + tracheal deviation |
| Open pneumothorax ("sucking chest wound") | O | Wound > 2/3 tracheal diameter → air preferentially enters through wound |
| Massive haemothorax | M | > 1500 mL blood in pleural space → hypovolaemic shock |
| Flail chest with pulmonary contusion | F | Paradoxical chest wall movement; the underlying contusion causes the real problem |
| Cardiac tamponade | C | Beck's triad (hypotension, JVD, muffled heart sounds) |
Exam Tip
Students often think flail chest itself causes respiratory failure. Actually, it's the underlying pulmonary contusion that is the primary cause of hypoxaemia. The paradoxical movement of the flail segment causes pain (which splints breathing) and mechanical disadvantage, but the contusion is what kills. This is why treatment focuses on analgesia + ventilatory support rather than surgical fixation of the flail segment (in most cases).
These are identified during the secondary survey. They may not be immediately obvious but can deteriorate.
| Condition | Notes |
|---|---|
| Aortic injury (ATAI) | Deceleration mechanism; widened mediastinum on CXR |
| Tracheobronchial injury | Persistent air leak despite chest drain; pneumomediastinum |
| Oesophageal injury | Left pneumothorax/hydrothorax without rib fractures; Hamman's sign |
| Myocardial contusion | Blunt anterior chest trauma; arrhythmias; ECG changes |
| Pulmonary contusion (without flail) | Appears as consolidation on CXR; worsens over 24-48h |
| Diaphragmatic rupture | Herniation of abdominal viscera; more common on left [3] |
| Simple pneumothorax / haemothorax | Not immediately life-threatening but needs monitoring/drainage |
| Structure | Injuries |
|---|---|
| Chest wall | Rib fractures, flail chest, sternal fracture, clavicle fracture, scapula fracture |
| Pleural space | Pneumothorax (simple, tension, open), haemothorax, haemopneumothorax |
| Lung parenchyma | Pulmonary contusion, pulmonary laceration/traumatic lung cyst |
| Tracheobronchial tree | Tracheal rupture, bronchial rupture |
| Heart/pericardium | Cardiac tamponade, myocardial contusion, commotio cordis, cardiac rupture |
| Great vessels | Acute traumatic aortic injury (ATAI), subclavian/carotid injury, pulmonary vessel injury |
| Oesophagus | Perforation (penetrating injury, Boerhaave's) |
| Diaphragm | Rupture (blunt > penetrating, left > right) |
| Thoracic spine | Fracture-dislocation (associated with spinal cord injury) |
6. Pathophysiology of Key Chest Injuries
6.1 Pneumothorax
"Pneumo" (Greek: pneuma = air) + "thorax" (Greek: chest). Air in the chest cavity.
- Air enters the pleural space via a breach in the visceral pleura (lung parenchyma injury) or parietal pleura (chest wall injury).
- The communication seals → no further air entry → intrapleural pressure is negative but less negative than normal → partial lung collapse.
- If < 15% lung volume and asymptomatic → may observe with O₂ therapy (promotes reabsorption of nitrogen; O₂ is absorbed 4× faster than N₂) [4].
This is a CLINICAL diagnosis. Do NOT wait for CXR. Treat immediately [4][5].
- Pathophysiology: A one-way valve mechanism allows air to enter the pleural space during inspiration but prevents it from escaping during expiration → progressive accumulation → positive intrapleural pressure → mediastinal shift → compression of contralateral lung (worsening hypoxia) + kinking of IVC/SVC → decreased venous return → obstructive shock [4][5].
- Causes: Penetrating chest trauma, rib fracture with lung laceration, positive pressure ventilation (barotrauma), failed/blocked chest drain [1].
- Clinical features: Severe respiratory distress, tachycardia, hypotension, distended neck veins (due to impaired venous return), tracheal deviation AWAY from affected side, absent breath sounds + hyperresonance on affected side [4].
- V/Q mismatch: The collapsed lung has no ventilation but still receives some blood flow (shunt); the contralateral compressed lung also has impaired ventilation → profound hypoxaemia.
- A defect in the chest wall that remains open → air preferentially enters through the wound if the defect is > 2/3 the diameter of the trachea (path of least resistance, since resistance is proportional to 1/radius⁴ by Poiseuille's law).
- Result: equilibration of intrapleural and atmospheric pressure → lung collapse → pendulum respiration (mediastinal swing).
- Management: three-sided occlusive dressing (allows air out during expiration but seals during inspiration) followed by definitive closure and chest drain [1].
"Haemo" (Greek: haima = blood) + "thorax."
- Blood accumulates in the pleural space from injured intercostal vessels, internal mammary vessels, lung parenchyma, or great vessels.
- Why does haemothorax cause shock? Two mechanisms:
- Hypovolaemic shock: Each hemithorax can hold 2-3L of blood. Massive haemothorax is defined as > 1500 mL of blood immediately drained on chest tube insertion, or > 200 mL/hour for 2-4 consecutive hours → indication for thoracotomy [1].
- Compression of lung: Blood occupies space → atelectasis → V/Q mismatch → hypoxaemia.
- Definition: ≥ 3 consecutive ribs fractured in ≥ 2 places (or ≥ 2 ribs fractured with bilateral costochondral separations) → a free-floating segment of chest wall.
- Paradoxical movement: During inspiration, the negative intrapleural pressure draws the flail segment INWARD (instead of outward with the rest of the chest wall). During expiration, the segment moves OUTWARD.
- Why does this cause respiratory failure?
- Underlying pulmonary contusion (the real killer) — direct lung parenchymal damage → haemorrhage and oedema into alveoli → intrapulmonary shunt → hypoxaemia.
- Pain → splinting → hypoventilation → atelectasis → infection.
- Mechanical disadvantage → reduced tidal volume.
- Treatment priority: analgesia (epidural/paravertebral block), oxygen, positive pressure ventilation if needed. Internal pneumatic splinting with positive pressure ventilation is the definitive management if mechanical ventilation is required [1].
- Mechanism: Blood accumulates in the pericardial sac (most commonly from penetrating injury to the heart, especially the right ventricle — the most anterior chamber).
- Pathophysiology: The fibrous pericardium is non-distensible in the acute setting → even small volumes (100-200 mL) → ↑intrapericardial pressure → compression of cardiac chambers (especially thin-walled RA and RV in diastole) → impaired diastolic filling → ↓stroke volume → ↓cardiac output → obstructive shock [1][5].
- Compensatory mechanisms: Initially, sympathetic activation → tachycardia + vasoconstriction to maintain BP. This is why the patient may look "stable" initially before sudden decompensation.
- Beck's triad: hypotension, distended neck veins, muffled heart sounds [1].
- Pulsus paradoxus: Exaggerated drop in systolic BP > 10 mmHg during inspiration. Mechanism: during inspiration, increased venous return to the right heart → RV distension → the interventricular septum bulges into the LV (because total cardiac volume is fixed by the non-distensible pericardium) → reduced LV filling → ↓stroke volume → ↓systolic BP.
- Kussmaul's sign: Paradoxical rise in JVP on inspiration (because the RV cannot accommodate the increased venous return).
- Electrical alternans on ECG: Alternating amplitude of QRS complexes due to the heart "swinging" in the pericardial fluid.
- Mechanism: high-speed deceleration (RTA, fall from height) [3].
- Site: aortic isthmus (80-85%) — where the mobile aortic arch meets the fixed descending aorta (tethered by the ligamentum arteriosum and intercostal arteries) [3].
- Lethality: 80-90% die at the scene. Of those reaching hospital, 30% die within 6h, 50% within 24h, 90% within 4 months if untreated [3].
- Pathophysiology: Shear force → intimal tear ± medial disruption → contained rupture (if the adventitia holds) → pseudoaneurysm. If the adventitia ruptures → free rupture → exsanguination.
- CXR clues: widened mediastinum ( > 8 cm), abnormal aortic contour/loss of aortic knuckle, thickened paratracheal stripe, deviation of trachea/NG tube to right, left apical pleural cap, depression of left main bronchus [3].
- CT aortogram is the definitive investigation (fast, high sensitivity) [3].
- Definition: Bruising of lung parenchyma → haemorrhage and oedema into the alveoli and interstitium.
- Pathophysiology: Direct impact → disruption of alveolocapillary membrane → blood and plasma leak into alveoli → consolidation + intrapulmonary shunt → hypoxaemia. Worsens over 24-48 hours as the inflammatory response peaks (similar to ARDS pathophysiology — diffuse alveolar damage) [3][9].
- CXR: consolidation that does NOT respect lobar boundaries (unlike pneumonia). Appears within 6 hours of injury [3].
- CT is more sensitive than CXR for detecting early/subtle contusion.
- Key difference from ARDS: pulmonary contusion is localised to the area of impact (though severe bilateral contusion can progress to ARDS).
- Left side > right side (liver protects the right hemidiaphragm) [3].
- Mechanism: Blunt abdominal/thoracic trauma → sudden increase in intra-abdominal pressure against a fixed diaphragm.
- Pathophysiology: Defect in diaphragm → pressure gradient between abdomen (positive) and thorax (negative) → progressive herniation of abdominal viscera (stomach, colon, spleen, omentum) into the thorax.
- Presentation is often insidious — the initial defect may be small, and organs herniate gradually over days to weeks [3].
- Risk: strangulation of herniated viscera (a surgical emergency) [3].
- CXR clues: Elevated hemidiaphragm, gas-filled viscus in thorax (gastric bubble), nasogastric tube coiled in thorax [3].
- Mechanism: Severe deceleration, crush injury, penetrating trauma.
- 80% occur within 2.5 cm of the carina.
- Pathophysiology: Airway rupture → massive air leak → pneumomediastinum, subcutaneous emphysema, persistent pneumothorax despite chest drain (the air leak cannot be controlled because air is continuously escaping from the ruptured airway).
- CXR: pneumomediastinum signs — ring around artery sign, continuous diaphragm sign, Naclerio's V sign, subcutaneous emphysema [3].
- Fallen lung sign: The collapsed lung falls peripherally/dependently (away from the hilum) rather than toward the hilum, because the bronchus is disrupted → the lung is no longer tethered to the mediastinum.
- Penetrating trauma or Boerhaave's syndrome (spontaneous rupture from forceful vomiting) [7].
- The oesophagus has no serosa → poor healing, rapid contamination of mediastinum [7].
- Pathophysiology: Perforation → leakage of gastric contents and saliva into mediastinum → chemical mediastinitis → bacterial mediastinitis → sepsis (mortality 20-40% even with treatment; approaches 100% if untreated for > 24h).
- Mackler's triad: vomiting, excruciating chest pain, subcutaneous emphysema [7].
- Hamman's sign: mediastinal crunching/clicking sound synchronous with heartbeat (due to mediastinal emphysema) [7].
- Mechanism: Direct sternal impact (steering wheel, fall onto anterior chest).
- Pathophysiology: Bruising of myocardium → myocardial oedema + haemorrhage → cellular dysfunction → arrhythmias (most dangerous consequence) and reduced contractility.
- The right ventricle is most commonly affected (most anterior chamber).
- Clinical features: May be asymptomatic. Chest pain (similar to pericarditis). Arrhythmias (sinus tachycardia, atrial fibrillation, premature ventricular contractions, ventricular tachycardia). Rarely → cardiogenic shock if severe contusion.
- ECG: ST-T changes, new RBBB, arrhythmias.
- Troponin: May be elevated (but non-specific in polytrauma).
- Echo: Wall motion abnormalities, pericardial effusion.
7. Clinical Features
| Symptom | Pathophysiological Basis |
|---|---|
| Chest pain | Rib fractures (somatic pain from periosteum), pleural irritation (pleuritic — sharp, worse with inspiration), myocardial/pericardial involvement (visceral pain — heavy, central), chest wall muscle/soft tissue injury |
| Dyspnoea / shortness of breath | Pneumothorax (lung collapse → ↓ventilation), haemothorax (compression atelectasis + hypovolaemia), flail chest (mechanical disadvantage + contusion), pulmonary contusion (intrapulmonary shunt), pain-induced splinting (→ hypoventilation) |
| Haemoptysis | Pulmonary contusion (bleeding into airways), tracheobronchial injury (direct airway damage), lung laceration |
| Dysphagia / odynophagia | Oesophageal injury (mucosal disruption → pain on swallowing), cervical spine/soft tissue injury (local swelling compressing oesophagus) |
| Sensation of "air under skin" | Subcutaneous emphysema from pneumomediastinum, open chest wound, tracheobronchial injury |
| Palpitations / syncope | Myocardial contusion (arrhythmias), cardiac tamponade (↓CO), massive blood loss (hypovolaemia → presyncope/syncope) |
| Abdominal pain | Lower rib fractures with underlying hepatic/splenic injury; diaphragmatic injury |
| Referred shoulder pain (Kehr's sign) | Diaphragmatic injury/irritation → referred pain via phrenic nerve (C3-C5: "C3, 4, 5 keeps the diaphragm alive") |
7.2 Signs
| Sign | Pathophysiological Basis |
|---|---|
| Tachycardia | Sympathetic response to pain, hypoxaemia, hypovolaemia. Often the earliest sign of shock — the heart beats faster to compensate for reduced stroke volume (CO = HR × SV) |
| Hypotension | Late sign of hypovolaemia (in young adults, BP may be maintained until ~30% blood volume is lost due to sympathetic compensation); also in obstructive shock (tamponade, tension PTX) |
| Tachypnoea | Hypoxaemia → peripheral chemoreceptors (carotid body) → increased respiratory drive; pain → shallow rapid breaths; metabolic acidosis from shock → compensatory hyperventilation |
| Central cyanosis | Desaturation of Hb when > 5 g/dL of deoxygenated Hb present → blue discolouration of tongue and lips. Caused by hypoxaemia from any mechanism (shunt, V/Q mismatch, hypoventilation). Late sign — indicates severe hypoxaemia (SpO₂ typically < 85%) |
| Altered consciousness | Cerebral hypoperfusion (shock) or hypoxaemia → decreased O₂ delivery to brain. Also consider concurrent head injury in polytrauma |
| Cold, clammy extremities | Sympathetic vasoconstriction → preferential blood flow to vital organs (heart, brain) at the expense of skin and periphery. Sign of compensated shock |
| Distended neck veins (elevated JVP) | Obstructive shock — tamponade or tension PTX. Venous blood cannot return to the right heart → venous congestion → JVD. Not seen in hypovolaemic shock (veins are flat due to low circulating volume) |
Important Distinction
Distended neck veins + hypotension + chest trauma = think obstructive shock (tamponade or tension PTX). Flat neck veins + hypotension + chest trauma = think hypovolaemic shock (massive haemothorax, splenic/hepatic injury). This single observation can help you differentiate the two at the bedside.
| Sign | Pathophysiological Basis |
|---|---|
| Visible wound / bruising | Direct evidence of mechanism (penetrating wound, seatbelt mark → think aortic injury, sternal fracture) |
| Chest wall tenderness / crepitus over ribs | Rib fracture — bony crepitus from fractured ends grating against each other. Tenderness from periosteal irritation |
| Paradoxical chest wall movement | Flail segment moves INWARD on inspiration, OUTWARD on expiration — because the flail segment is no longer mechanically coupled to the intact rib cage and moves in response to pleural pressure changes rather than chest wall muscular action |
| Subcutaneous emphysema ("bubble-wrap" / "Rice Krispie" sensation on palpation) [3] | Air tracking into subcutaneous tissues from: pneumothorax extending into chest wall, pneumomediastinum, tracheobronchial rupture, open pneumothorax |
| Sucking wound | Open pneumothorax — audible air entry/exit through the wound during respiration |
| Splinting | Patient voluntarily restricts chest wall movement on the injured side to reduce pain (rib fractures). This leads to hypoventilation → atelectasis → secondary pneumonia |
| Sign | Condition | Pathophysiological Basis |
|---|---|---|
| Hyperresonance to percussion | Pneumothorax | Air in pleural space increases resonance (like tapping an empty drum) |
| Dullness (stony dull) to percussion | Haemothorax | Blood (fluid) in pleural space dampens percussion (like tapping a full drum) |
| Absent / decreased breath sounds | Pneumothorax or haemothorax | Air or blood in pleural space → lung collapse → no air movement → no breath sounds. Can also occur with massive pulmonary contusion |
| Tracheal deviation (away from affected side) | Tension PTX, massive haemothorax | Positive pressure or volume in one hemithorax pushes the mediastinum to the opposite side |
| Tracheal deviation (towards affected side) | Massive atelectasis / lung collapse | Loss of lung volume on affected side → negative pressure "pulls" mediastinum toward it |
| Muffled / distant heart sounds | Cardiac tamponade | Fluid around the heart attenuates sound transmission |
| Pericardial friction rub | Traumatic pericarditis | Inflamed pericardial surfaces rub against each other — high-pitched scratching sound [6] |
| Hamman's sign (mediastinal crunch) | Pneumomediastinum | Air in mediastinum produces crackling/crunching sounds synchronous with heartbeat [7] |
| Bowel sounds in chest | Diaphragmatic rupture with herniation | Bowel has herniated through the ruptured diaphragm into the thorax [3] |
| Sign Cluster | Diagnosis | Explanation |
|---|---|---|
| Beck's triad: hypotension + JVD + muffled heart sounds | Cardiac tamponade | ↓CO (hypotension), impaired venous return (JVD), fluid around heart (muffled sounds) |
| Pulsus paradoxus ( > 10 mmHg SBP drop in inspiration) | Cardiac tamponade | Fixed pericardial volume → septal shift during inspiration → ↓LV filling → ↓SBP |
| Kussmaul's sign (JVP rises on inspiration) | Cardiac tamponade / constrictive pericarditis | RV cannot accommodate ↑venous return during inspiration |
| Electrical alternans on ECG | Large pericardial effusion | Heart "swings" in fluid → alternating QRS axis |
| Mackler's triad: vomiting + chest pain + subcutaneous emphysema | Oesophageal rupture (Boerhaave's) | Forceful vomiting → full-thickness rupture → mediastinal air [7] |
| Widened mediastinum + loss of aortic knuckle on CXR | Aortic injury (ATAI) | Mediastinal haematoma from contained aortic rupture [3] |
8. Special Populations and Considerations
- Reduced physiological reserve: Pre-existing cardiopulmonary disease, medications (beta-blockers may mask tachycardia, anticoagulants increase bleeding risk).
- Osteoporotic ribs: Fracture with lower energy → higher morbidity per rib fractured.
- Each additional rib fracture in elderly patients increases pneumonia risk by ~27% and mortality by ~19% [literature].
- Blunted sympathetic response: Tachycardia may be absent → "look-well" patient who is actually in compensated shock.
- Compliant chest wall: Children have very flexible ribs → significant internal organ injury can occur WITHOUT rib fractures. If a child has rib fractures, suspect very high-energy mechanism (or NAI — non-accidental injury).
- Higher metabolic rate: Decompensate more quickly.
- Small blood volume: Relatively smaller absolute volume → smaller blood loss is proportionally more significant.
- Physiological changes: ↑blood volume (by ~40%), ↑heart rate, ↓BP (physiological) → may mask haemorrhage.
- Elevated diaphragm: Chest drain insertion should be 1-2 intercostal spaces higher than usual.
- Supine hypotension: Gravid uterus compresses IVC → always tilt to left lateral position (or manual left uterine displacement) in supine patients.
9. Initial Clinical Approach (ATLS Framework)
The approach to chest trauma follows ATLS principles: primary survey (ABCDE) with simultaneous resuscitation → adjuncts (CXR, FAST) → secondary survey → definitive care [1][2].
- Full head-to-toe examination including log roll [2].
- Trauma series: AP CXR, AP pelvis XR. (Lateral C-spine XR largely replaced by CT in modern practice but still relevant in resource-limited settings.) [2][3]
- FAST scan: To detect pericardial effusion and intra-abdominal free fluid [2][3][10].
FAST scan assesses 4 windows: subxiphoid (pericardial), right upper quadrant/Morison's pouch (hepatorenal), left upper quadrant (splenorenal), pelvis (pouch of Douglas). ± Extended FAST (eFAST) includes bilateral thoracic views for pneumothorax and haemothorax [3][10].
- CT whole body ("trauma CT"): Gold standard for stable patients to fully evaluate all injuries [2][3].
- Arterial phase: for bleeding points and pseudoaneurysms
- Portovenous phase (most important): visceral injury
- Delayed phase: urinary extravasation
- Lung and bone windows [10]
| Injury | Mechanism → Pathophysiology → Clinical Consequence |
|---|---|
| Tension PTX | Valve mechanism → ↑intrapleural pressure → mediastinal shift → ↓venous return → obstructive shock |
| Open PTX | Chest wall defect > 2/3 trachea → equalised pressures → lung collapse → respiratory failure |
| Massive haemothorax | Vascular injury → blood in pleural space → hypovolaemia + lung compression |
| Flail chest | Multiple rib fractures → paradoxical movement → pain + underlying contusion → shunt → hypoxaemia |
| Cardiac tamponade | Blood in pericardium → ↑intrapericardial pressure → ↓diastolic filling → obstructive shock |
| ATAI | Deceleration shear → intimal tear at isthmus → contained rupture (if adventitia intact) or free rupture → exsanguination |
| Pulmonary contusion | Direct impact → alveolocapillary damage → haemorrhage/oedema → intrapulmonary shunt → hypoxaemia |
| Diaphragmatic rupture | ↑abdominal pressure → diaphragm tear → visceral herniation → lung compression ± visceral strangulation |
| Tracheobronchial injury | Direct disruption → massive air leak → persistent PTX despite drainage |
| Oesophageal rupture | Full-thickness tear → mediastinal contamination → mediastinitis → sepsis |
High Yield Summary
Definition: Chest injury = trauma to chest wall, pleural space, lungs, airways, heart, great vessels, oesophagus, or diaphragm.
Epidemiology: Trauma = #1 killer < 40 years. Chest injuries in ~25% of trauma deaths. Blunt > penetrating in Hong Kong. RTAs most common mechanism.
Immediately life-threatening (ATOM-FC): Airway obstruction, Tension PTX, Open PTX, Massive haemothorax, Flail chest (with pulmonary contusion), Cardiac tamponade.
Potentially life-threatening: Aortic injury, Tracheobronchial injury, Oesophageal injury, Myocardial contusion, Pulmonary contusion, Diaphragmatic rupture, Simple PTX/haemothorax.
Key pathophysiology concepts:
- Tension PTX: valve → ↑pressure → ↓VR → obstructive shock (clinical diagnosis, treat immediately)
- Tamponade: non-distensible pericardium → ↓diastolic filling → ↓CO (Beck's triad)
- ATAI: deceleration shear at aortic isthmus → 80-90% die at scene → widened mediastinum on CXR
- Pulmonary contusion: alveolocapillary damage → shunt → hypoxaemia (worsens over 24-48h)
- Flail chest: underlying contusion is the real killer, not the paradoxical movement
- Oesophageal rupture: no serosa → rapid mediastinitis (Mackler's triad)
Approach: ATLS primary survey (ABCDE) with simultaneous resuscitation → adjuncts (CXR, eFAST) → secondary survey → CT (if stable) → definitive care.
Rib fracture associations: Upper ribs (1st-2nd) → great vessel/mediastinal injury. Lower ribs (10th-12th) → hepatic/splenic injury. 4th-10th → most commonly fractured.
Active Recall - Chest Injury
[1] Lecture slides: GC 182. Chopped and stabbed wound in gang fight Nerves and vascular injury; Classification of injuries.pdf [2] Lecture slides: GC 175. A bus hit a train Multiple trauma; Disaster management.pdf [3] Senior notes: Ryan Ho Radiology.pdf (Chapter 1: Radiology in Trauma) [4] Senior notes: Maksim Medicine Notes.pdf (p291, Pneumothorax) [5] Senior notes: Ryan Ho Respiratory.pdf (p151-152, Pneumothorax) [6] Senior notes: Ryan Ho Cardiology.pdf (p172, Diseases of Pericardium) [7] Senior notes: Maksim Surgery Notes.pdf (p58-59, Esophageal perforation / Boerhaave's) [8] Lecture slides: GC 190. I have a scald Burn.pdf [9] Senior notes: Ryan Ho Respiratory.pdf (p37, ARDS pathophysiology) [10] Senior notes: Maksim Surgery Notes.pdf (p42, Trauma / FAST scan)
Differential Diagnosis of Chest Injury
When a patient presents with chest trauma, your clinical job is not just to identify that there is a chest injury — it's to work out which specific injury (or injuries) are present, because each has a different management pathway. In polytrauma, multiple injuries coexist, so you're essentially running through a mental checklist. But equally important is distinguishing traumatic chest pathology from non-traumatic causes of acute chest pain/dyspnoea that may mimic trauma presentations (e.g., the patient who crashed their car because they had an MI, not the other way around).
This section approaches the DDx in two ways:
- Differential diagnosis within chest trauma — i.e., which specific traumatic injury is causing the patient's clinical picture?
- Differential diagnosis of acute chest pain/dyspnoea — i.e., ruling out non-traumatic mimics.
1. Systematic Differential Diagnosis Within Chest Trauma
The key to differential diagnosis in chest trauma is thinking by anatomical structure and by clinical presentation. The mechanism of injury guides your pre-test probability for each diagnosis.
1.1 By Presenting Clinical Syndrome
In practice, a trauma patient presents with one or more of these syndromes. Each syndrome has a differential within the trauma context.
The critical question here is: What type of shock? The answer narrows the differential enormously.
| Type of Shock | Mechanism | Differentials | Key Distinguishing Features |
|---|---|---|---|
| Hypovolaemic | Blood loss → ↓circulating volume → ↓preload → ↓CO | Massive haemothorax, intercostal artery bleeding, great vessel injury with mediastinal haemorrhage, associated intra-abdominal injury (splenic/hepatic — especially with lower rib fractures) [10] | Flat neck veins, tachycardia, pale/cold, stony dull to percussion on affected side, blood on chest drain |
| Obstructive | Mechanical obstruction to cardiac filling or output | Tension pneumothorax, cardiac tamponade [4][5] | Distended neck veins (key differentiator from hypovolaemic). Tension PTX: absent breath sounds + hyperresonance + tracheal deviation. Tamponade: muffled heart sounds, pulsus paradoxus, electrical alternans |
| Cardiogenic | Pump failure | Myocardial contusion (severe), traumatic valvular injury, myocardial infarction (may be the cause of the trauma, e.g., patient had MI → crashed car) | Pulmonary oedema, gallop rhythm, ECG changes, ↑troponin, poor response to fluid resuscitation |
Clinical Pearl — JVP is Your Best Friend in Trauma
At the bedside, the JVP is the single most useful sign to differentiate shock type in chest trauma. Distended neck veins = obstructive (tamponade or tension PTX). Flat neck veins = hypovolaemic (haemothorax, intra-abdominal bleeding). If the JVP is elevated and the patient is hypotensive — you must immediately rule out tension PTX and tamponade before anything else [4][5].
| Differential | Why This Causes Respiratory Distress | Key Distinguishing Features |
|---|---|---|
| Tension pneumothorax | Progressive positive pressure → lung collapse + mediastinal shift → ↓ventilation bilaterally + ↓venous return | Clinical diagnosis — absent BS, hyperresonance, tracheal deviation, obstructive shock. Do NOT wait for CXR [4] |
| Open pneumothorax | Chest wall defect → equilibration of intrapleural and atmospheric pressure → lung collapse | Visible chest wall wound with audible air movement ("sucking wound"). Wound > 2/3 diameter of trachea → air preferentially enters wound [1] |
| Simple pneumothorax | Air in pleural space → partial lung collapse → ↓ventilation on that side → V/Q mismatch | ↓breath sounds + hyperresonance, but patient haemodynamically stable. CXR: rim of hyperlucency without lung markings [4][3] |
| Massive haemothorax | Blood compresses lung → atelectasis + hypovolaemia → ↓O₂ delivery | Stony dull percussion, ↓BS, shock. > 1500 mL on chest drain [1] |
| Flail chest with pulmonary contusion | Paradoxical wall movement + underlying contusion → intrapulmonary shunt → hypoxaemia | Paradoxical chest wall movement, visible/palpable crepitus, worsening hypoxaemia over 24-48h (contusion evolves) [3] |
| Pulmonary contusion (without flail) | Haemorrhage into alveoli → shunt → hypoxaemia | CXR: non-lobar consolidation at site of impact. May not be apparent on initial CXR — evolves over 6-24h [3] |
| Tracheobronchial rupture | Massive air leak from disrupted airway → persistent pneumothorax, pneumomediastinum | Persistent air leak despite functioning chest drain, massive subcutaneous emphysema, fallen lung sign on CXR |
| Diaphragmatic rupture | Herniation of abdominal viscera → compression of lung | Bowel sounds in chest, elevated hemidiaphragm, gastric bubble/NG tube in thorax on CXR [3] |
Once the immediately life-threatening injuries are excluded, the stable patient with post-traumatic chest pain has a different DDx:
| Differential | Features |
|---|---|
| Rib fractures (isolated) | Point tenderness, crepitus, pain on coughing/deep breathing, CXR may miss up to 50% [3] |
| Sternal fracture | Anterior chest pain, palpable step deformity. Suspect myocardial contusion underneath |
| Costochondral separation | Pain at costochondral junction, often missed on imaging |
| Myocardial contusion | Anterior chest pain, arrhythmias, ECG changes (ST-T, new RBBB). Think of this with any sternal/anterior chest impact |
| Traumatic pericarditis | Pleuritic chest pain relieved by sitting forward, pericardial friction rub, diffuse ST elevation [6] |
| Aortic injury (ATAI) | May be relatively asymptomatic initially ("contained rupture"). Widened mediastinum on CXR is the key screening finding [3] |
| Oesophageal perforation | Post-penetrating injury or after forceful vomiting. Mackler's triad, Hamman's sign, pneumomediastinum [7] |
This is where your history of the mechanism becomes the most powerful diagnostic tool. Each mechanism predicts a pattern.
| Mechanism | Expected Injuries (Think of These) |
|---|---|
| Frontal RTA (driver, steering wheel) | Sternal fracture, myocardial contusion, bilateral anterior rib fractures, bilateral pulmonary contusion, ATAI (deceleration), cardiac tamponade |
| Lateral RTA (T-bone) | Ipsilateral rib fractures, flail chest, splenic injury (left), hepatic injury (right), diaphragmatic rupture, pelvic fracture |
| Pedestrian hit by vehicle | Depends on impact point. Chest impact → rib fractures, pulmonary contusion. Associated head injury, long bone fractures |
| Fall from height | Bilateral calcaneal fractures, vertebral fractures, bilateral pulmonary contusion, ATAI (vertical deceleration), diaphragmatic rupture |
| Stab wound to chest [1] | Haemothorax, pneumothorax, cardiac tamponade (if in "cardiac box"), great vessel injury. Wound deeper than platysma in neck → operative exploration [1] |
| Chopping wound [1] | Similar to stab but more tissue destruction, nerve and vascular injury at the wound site [1] |
| Blast injury | Blast lung (barotrauma), tympanic membrane rupture, penetrating fragment injuries, burns |
| Crush injury | Flail chest, bilateral pulmonary contusion, traumatic asphyxia (superior vena cava syndrome from prolonged thoracic compression) |
2. Differential Diagnosis: Non-Traumatic Mimics
This is crucial because sometimes the medical condition caused the trauma (e.g., MI → car crash), or a pre-existing condition coexists and confounds the picture. Always consider whether a medical event preceded the injury [11][12].
The standard acute chest pain differential applies and must be considered even in trauma [11][12][13]:
| System | Potentially Life-Threatening | Relatively Benign |
|---|---|---|
| CVS | Acute coronary syndrome (ACS), aortic dissection, myopericarditis ± cardiac tamponade | Stable angina |
| Pulmonary | Pulmonary embolism, tension/massive pneumothorax, pneumonia | Small pneumothorax |
| GI | Boerhaave's perforation, PUD perforation | GERD |
| Chest wall | — | Musculoskeletal pain, costochondritis, rib fracture, herpes zoster |
| Psychological | — | Panic attack |
This table is taken directly from the standard clinical approach to acute chest pain [11][12].
Don't Forget: The Chicken or the Egg?
A 60-year-old driver has an RTA. He has chest pain. Is the chest pain FROM the crash (steering wheel injury → myocardial contusion) or did he have an MI/arrhythmia that CAUSED the crash? Always get a pre-crash history: Did the patient have chest pain or feel unwell BEFORE the accident? Were they feeling dizzy or did they lose consciousness? This changes management entirely — the patient may need PCI alongside trauma management.
| Feature | Traumatic Chest Injury | Non-Traumatic Cause |
|---|---|---|
| History | Clear mechanism of trauma | Symptoms preceded the trauma, or no trauma history |
| Pain character | Localised, pleuritic (rib fractures), related to impact site | ACS: dull, central, radiating to jaw/arm. Aortic dissection: tearing, radiating to back [13] |
| ECG | May show sinus tachycardia, new RBBB (myocardial contusion) | STEMI (ST elevation in coronary territory), PE (S1Q3T3, RV strain), pericarditis (diffuse concave-up ST elevation with PR depression) [6] |
| Troponin | May be mildly elevated (contusion, trauma-related demand ischaemia) | Significantly elevated and rising in serial measurements (ACS) |
| CXR | Rib fractures, pneumothorax, haemothorax, pulmonary contusion, widened mediastinum | Pneumonia (lobar consolidation), heart failure (cardiomegaly, Kerley B lines, bat-wing oedema), PE (may be normal or show Hampton's hump/Westermark's sign) |
| D-dimer | Non-specific elevation (trauma activates coagulation) | Useful to rule out PE in low pre-test probability [14] |
The most important bedside distinction is between the immediately life-threatening injuries (because each has a specific, time-critical intervention).
| Feature | Tension PTX | Cardiac Tamponade | Massive Haemothorax |
|---|---|---|---|
| Neck veins | Distended | Distended | Flat |
| Breath sounds | Absent ipsilateral | Normal or ↓bilateral | Absent ipsilateral |
| Percussion | Hyperresonant | Normal | Stony dull |
| Tracheal deviation | Away from affected side | Midline | Away from affected side (if large) |
| Heart sounds | Normal | Muffled | Normal |
| Underlying pathophysiology | Positive pressure → ↓VR | Pericardial blood → ↓diastolic filling | Blood loss → ↓circulating volume |
| Immediate treatment | Needle decompression → chest drain [4] | Pericardiocentesis (subxiphoid) [1] | Chest drain + volume resuscitation ± thoracotomy [1] |
Exam Favourite
The tension PTX vs. cardiac tamponade distinction is a common exam question. Both present with hypotension + distended neck veins. The key differentiators are: (1) Breath sounds — absent in tension PTX, present in tamponade; (2) Percussion — hyperresonant in tension PTX, normal in tamponade; (3) Tracheal deviation — present in tension PTX, absent in tamponade. Remember: tamponade is a central problem (heart), tension PTX is a lateral problem (pleural space).
5. Special Differential Diagnosis Scenarios
This combination should raise suspicion for:
- Oesophageal rupture (Boerhaave's or penetrating) — because the left posterolateral distal oesophagus is the most common rupture site → contamination of left pleural space [7]
- Diaphragmatic rupture with herniation of abdominal contents [3]
- Thoracic duct injury → chylothorax (rare, usually with penetrating left supraclavicular/mediastinal trauma)
DDx beyond ATAI [3]:
- Aortic dissection (non-traumatic — consider if risk factors present: hypertension, Marfan's, cocaine)
- Mediastinal haematoma from vertebral fracture
- Thymic/mediastinal mass (incidental finding)
- Technical factors: AP projection (magnifies mediastinum vs. PA), supine positioning, patient rotation
- In trauma, CXR is often AP supine — this artefactually widens the mediastinum. Always consider this before panicking, but err on the side of further imaging (CT aortogram) if concerned.
Penetrating injury to the neck is closely related to chest injury because structures traversing the thoracic inlet can be injured. The lecture slides specifically highlight [1]:
- Exsanguinating external bleeding (may be from external jugular vein)
- Expanding haematoma → requires endotracheal intubation to protect airway then operative exploration
- If unsure of diagnosis or wound deeper than platysma → operative exploration or CT angiography
The neck is traditionally divided into three zones for penetrating injuries:
| Zone | Boundaries | Structures at Risk | Management Approach |
|---|---|---|---|
| Zone I | Clavicles/sternal notch to cricoid | Great vessels, trachea, oesophagus, thoracic duct, lung apices | CT angiography → selective exploration (difficult surgical access) |
| Zone II | Cricoid to angle of mandible | Carotid/jugular, larynx, trachea, oesophagus | Traditionally: mandatory exploration if platysma violated. Modern: selective approach with CT angiography |
| Zone III | Angle of mandible to skull base | Distal carotid/vertebral arteries, pharynx | CT angiography → angiography/embolisation (difficult surgical access) |
Lower rib fractures (10th-12th) should trigger consideration of abdominal organ injury [3][10]:
- Left lower ribs → Splenic injury (delayed rupture possible — patient may be stable initially then deteriorate hours/days later) [10]
- Right lower ribs → Hepatic injury
- Bilateral lower ribs → Renal injury
This is why a FAST scan is essential even in patients presenting primarily with chest trauma — the diaphragm is not a boundary for injury patterns.
Thoracic spinal fractures are part of the chest trauma DDx because:
- They coexist with other thoracic injuries (especially in high-energy mechanisms)
- They can cause spinal cord injury → paraplegia [15]
- Vertebral fractures can cause mediastinal haematoma → widening on CXR (mimicking ATAI)
- They contribute to neurogenic shock (loss of sympathetic tone below the level of injury → vasodilation + bradycardia → hypotension with paradoxical bradycardia — unlike hypovolaemic shock which has tachycardia)
| Clinical Finding | Most Likely Diagnosis | Pathophysiological Reasoning |
|---|---|---|
| Shock + flat JVP + stony dull percussion | Massive haemothorax | Blood loss (hypovolaemia) + fluid in pleural space (dull percussion) |
| Shock + distended JVP + absent BS + hyperresonance | Tension PTX | Positive intrapleural pressure → ↓VR (JVD) + air (hyperresonance) |
| Shock + distended JVP + muffled HS + pulsus paradoxus | Cardiac tamponade | Blood in pericardium → ↓diastolic filling → ↓CO |
| Paradoxical chest wall movement + worsening hypoxia | Flail chest + pulmonary contusion | Free-floating rib segment + underlying alveolar haemorrhage |
| Persistent PTX despite chest drain + massive subcutaneous emphysema | Tracheobronchial rupture | Continuous air leak from disrupted airway |
| Widened mediastinum + high-speed deceleration | ATAI | Aortic shear at isthmus → contained rupture → mediastinal haematoma |
| Bowel sounds in chest + elevated hemidiaphragm | Diaphragmatic rupture | Visceral herniation through torn diaphragm into thorax |
| Vomiting → chest pain → subcutaneous emphysema | Oesophageal rupture (Boerhaave's) | Full-thickness rupture → air leaks into mediastinum |
| Sternal fracture + arrhythmia + anterior chest impact | Myocardial contusion | Bruising of RV myocardium → electrical instability |
| Sucking wound on chest wall | Open PTX | Chest wall defect allows air entry → lung collapse |
High Yield Summary
Key DDx Framework for Chest Trauma:
-
By shock type: Hypovolaemic (massive haemothorax → flat JVP) vs. Obstructive (tension PTX or tamponade → distended JVP) vs. Cardiogenic (myocardial contusion). JVP is the key bedside differentiator.
-
By mechanism: Blunt deceleration → ATAI, pulmonary contusion. Blunt compression → rib fractures, flail chest, cardiac contusion. Penetrating → haemo/pneumothorax, tamponade, vascular injury.
-
Don't forget non-traumatic mimics: ACS (may have caused the trauma), PE, spontaneous PTX, aortic dissection. Always ask if symptoms preceded the trauma.
-
Tension PTX vs. Tamponade: Both have hypotension + JVD. Tension PTX has absent BS + hyperresonance + tracheal deviation. Tamponade has muffled HS + pulsus paradoxus + normal BS.
-
Rib fracture associations: Upper ribs → great vessel/mediastinal injury. Lower ribs → splenic/hepatic injury. Paediatric rib fractures without high-energy mechanism → consider NAI.
-
Penetrating neck wounds deeper than platysma → operative exploration or CT angiography [1].
Active Recall - Chest Injury DDx
References
[1] Lecture slides: GC 182. Chopped and stabbed wound in gang fight Nerves and vascular injury; Classification of injuries.pdf [2] Lecture slides: GC 175. A bus hit a train Multiple trauma; Disaster management.pdf [3] Senior notes: Ryan Ho Radiology.pdf (Chapter 1: Radiology in Trauma) [4] Senior notes: Maksim Medicine Notes.pdf (p291, Pneumothorax) [5] Senior notes: Ryan Ho Respiratory.pdf (p151-152, Pneumothorax) [6] Senior notes: Ryan Ho Cardiology.pdf (p172, Diseases of Pericardium) [7] Senior notes: Maksim Surgery Notes.pdf (p58-59, Esophageal perforation / Boerhaave's) [10] Senior notes: Maksim Surgery Notes.pdf (p42, Trauma / FAST scan) [11] Senior notes: Maksim Medicine Notes.pdf (p5, Chest Pain DDx) [12] Senior notes: Ryan Ho Fundamentals.pdf (p199-203, Chest Pain) [13] Senior notes: Ryan Ho Cardiology.pdf (p54-58, Chest Pain) [14] Senior notes: Ryan Ho Haemtology.pdf (p131, VTE) [15] Senior notes: Ryan Ho Neurology.pdf (p168, Approach to Paraplegia)
Diagnostic Criteria, Diagnostic Algorithm, and Investigation Modalities for Chest Injury
Unlike many medical conditions, chest trauma does not have a single set of "diagnostic criteria" in the way that, say, ARDS has the Berlin criteria or rheumatic fever has the Jones criteria. Instead, diagnosis in chest trauma operates on a pattern-recognition and exclusion model within the ATLS framework. The diagnosis of each specific injury relies on a combination of:
- Mechanism of injury (raises pre-test probability)
- Clinical findings (many immediately life-threatening injuries are clinical diagnoses — especially tension PTX)
- Bedside investigations (CXR, eFAST)
- Advanced imaging (CT — the gold standard for the stable patient)
The key philosophical point: In an unstable trauma patient, treatment precedes definitive diagnosis. You decompress first, image later [4][10].
2. Diagnostic Criteria for Specific Chest Injuries
While there aren't overarching "diagnostic criteria" for chest trauma as a whole, individual injuries do have defined diagnostic features:
This is a CLINICAL diagnosis. Do NOT wait for CXR or any imaging [4][5].
Diagnostic criteria (all clinical):
- Severe respiratory distress
- Obstructive shock: hypotension + elevated JVP
- Ipsilateral absent breath sounds + hyperresonance
- Tracheal deviation to contralateral side (may be absent in splinted mediastinum, e.g., malignancy/fibrosis)
- Immediate improvement after needle decompression confirms the diagnosis (therapeutic and diagnostic simultaneously)
Why No Imaging?
Sending a patient with suspected tension PTX for CXR wastes precious minutes. The positive intrapleural pressure progressively worsens venous return compromise — cardiac arrest can occur within minutes. The diagnosis is made clinically and confirmed by the response to decompression. If you're wrong (rare), a needle in the chest of a patient who doesn't have tension PTX causes minimal harm. If you delay in a patient who does have it, they die.
Diagnostic criteria:
- > 1500 mL of blood drained immediately on chest tube insertion, OR
- > 200 mL/hour of ongoing drainage for 2-4 consecutive hours [1]
- These are the indications for thoracotomy — they define the injury as "massive" and imply a source (usually intercostal artery, internal mammary artery, or great vessel) that will not stop without surgical intervention.
Diagnostic criteria:
- ≥ 3 consecutive ribs fractured in ≥ 2 places each (creating a free-floating segment), OR
- ≥ 2 ribs fractured bilaterally with sternal separation
- Paradoxical chest wall movement on inspection
- Underlying pulmonary contusion (the cause of significant morbidity) typically confirmed on CXR/CT
Diagnostic criteria (clinical + bedside):
Diagnostic criteria (radiological):
- CXR screening: widened mediastinum ( > 8 cm on AP), loss of aortic knuckle, thickened paratracheal stripe, tracheal/NG deviation to right, left apical cap, depression of left main bronchus [3]
- CT aortogram (definitive): intimal flap, pseudoaneurysm, mediastinal haematoma, extravasated contrast, periaortic haematoma [3]
- 80-85% occur at the aortic isthmus [3]
Diagnostic criteria (radiological):
- Erect CXR: visible visceral pleural edge with radiolucency and no lung markings peripheral to it [3][4]
- Supine CXR (common in trauma — patient cannot sit up): deep sulcus sign, double diaphragm sign, increased sharpness of mediastinal/cardiac borders, depression of ipsilateral hemidiaphragm [3]
- Size classification [4]:
- Small: < 2 cm between lung edge and chest wall at level of hilum
- Large: ≥ 2 cm (≈ ↓50% lung volume)
- Formula: % pneumothorax = (1 - average lung diameter³ / average hemithorax diameter³) × 100%
- 1 cm on PA CXR ≈ 27% hemithorax
Diagnostic criteria:
- CXR: non-lobar consolidation at site of impact, appearing within 6 hours [3]
- CT is more sensitive: ground-glass opacification and consolidation not respecting lobar boundaries
- Clinical correlation: worsening hypoxaemia over 24-48 hours despite treatment
- Key distinguishing feature from pneumonia: contusion follows the anatomical distribution of impact, not lobar anatomy; appears early; no infectious prodrome
Diagnostic criteria:
- CXR: elevated hemidiaphragm, gas-filled viscus above diaphragm, NG tube coiled in thorax [3]
- CT with coronal/sagittal reconstruction: direct visualisation of diaphragmatic discontinuity with herniated viscera
- Contrast studies (barium meal/water-soluble contrast): confirm bowel in thorax [3]
- Often diagnosed late — presentation can be insidious with a small defect that enlarges over time [3]
Diagnostic criteria:
- Clinical: Mackler's triad (vomiting + excruciating chest pain + subcutaneous emphysema) [7]
- CXR: pneumomediastinum, surgical emphysema, left pleural effusion [7]
- CT with oral water-soluble contrast: localises the site of perforation (contrast extravasation) [7]
- Hamman's sign: mediastinal crunching synchronous with heartbeat [7]
The following algorithm integrates the ATLS approach with the diagnostic modalities, showing the decision pathway from initial assessment to definitive diagnosis.
4. Investigation Modalities — Comprehensive Guide
4.1 Bedside / Immediate Investigations
This is technically the first "investigation." Many immediately life-threatening injuries are clinical diagnoses:
| Injury | Clinical Diagnosis Sufficient? | Rationale |
|---|---|---|
| Tension PTX | YES — treat without imaging | Delay kills. Clinical findings are pathognomonic |
| Open PTX | YES — visible wound | Obvious external wound with air movement |
| Massive haemothorax | Partially — clinical + chest drain output | Need chest drain to confirm volume |
| Cardiac tamponade | Partially — clinical + FAST | Beck's triad may be incomplete; FAST confirms |
| Flail chest | YES — inspection + palpation | Paradoxical movement + crepitus |
The single most important initial imaging investigation in chest trauma. Obtained as part of the trauma series (AP CXR, AP pelvis) [3][10]. Note that in modern practice, CT has largely replaced the lateral C-spine XR, but CXR remains essential [10].
Supine CXR Pitfalls
In trauma, CXR is almost always taken AP supine (patient cannot sit up). This has important implications:
- Mediastinum appears wider (AP magnification + supine redistribution of blood) — don't panic about "widened mediastinum" before considering technique
- Pneumothorax is easily missed — air rises anteriorly in the supine patient, not to the apex. Look for deep sulcus sign, double diaphragm sign [3]
- Small haemothorax may layer posteriorly → appears as diffuse haziness rather than a meniscus
Systematic CXR interpretation in trauma (use a checklist approach):
| Structure | What to Look For | Injury Suggested |
|---|---|---|
| Airway/Trachea | Deviation, subcutaneous emphysema | Tension PTX (away), massive atelectasis (toward), pneumomediastinum |
| Bones | Rib fractures (cortical breaks, esp lateral), sternal fracture, scapula fracture, clavicle fracture | CXR may miss up to 50% of rib fractures [3]. Upper rib fractures → suspect great vessel injury. Lower ribs → suspect abdominal organ injury [3] |
| Cardiac silhouette | Enlarged (globular/"water bottle" shape) | Pericardial effusion / tamponade (but may be normal acutely) |
| Diaphragm | Elevated hemidiaphragm, gas above diaphragm, NG tube in thorax | Diaphragmatic rupture [3] |
| Effusion/fluid | Blunted CP angle, meniscus, diffuse haziness (supine) | Haemothorax |
| Fields (lung) | Consolidation (non-lobar), hyperlucency | Pulmonary contusion (consolidation at impact site) [3], pneumothorax (hyperlucency) |
| Gadgets | ET tube position, chest drain, NG tube position | Malpositioned devices, NG tube in thorax (diaphragmatic rupture) |
| Heart/mediastinum | Widened mediastinum ( > 8 cm), abnormal aortic contour, thickened paratracheal stripe | ATAI [3] |
The mnemonic "ABCDEFGH" (Airway, Bones, Cardiac, Diaphragm, Effusion, Fields, Gadgets, Heart/mediastinum) helps ensure you don't miss anything.
Key CXR signs and their pathological basis:
| CXR Sign | Pathological Basis | Condition |
|---|---|---|
| Visible visceral pleural edge | Air separates visceral from parietal pleura → visible white line | Pneumothorax (erect CXR) [3] |
| Deep sulcus sign | In supine patient, free air collects anteroinferiorly → extends costophrenic sulcus deeper than normal | Pneumothorax (supine CXR) [3] |
| Double diaphragm sign | Air outlines both the dome and anterior insertion of diaphragm | Pneumothorax (supine CXR) [3] |
| Meniscus sign | Fluid curves upward at periphery due to capillary action and gravity | Pleural effusion / haemothorax [16] |
| Widened mediastinum | Mediastinal haematoma from contained aortic rupture expands the mediastinal contour | ATAI [3] |
| Loss of aortic knuckle | Haematoma obscures the normal aortic arch contour | ATAI [3] |
| Ring around artery sign | Gas surrounding the pulmonary artery | Pneumomediastinum [3] |
| Continuous diaphragm sign | Gas trapped posterior to pericardium allows visualisation of entire diaphragm as a continuous line | Pneumomediastinum [3] |
| Naclerio's V sign | Gas extending along descending aorta intersects with gas along medial left hemidiaphragm, forming a V | Pneumomediastinum [3] |
| Subcutaneous emphysema | Gas densities tracking in soft tissue planes | Pneumothorax, tracheobronchial injury, open wound [3] |
| Callus formation on ribs | Healing fracture (10-14 days) — implies old injury | Important for timing injury (relevant in NAI in children, medicolegal) [3] |
FAST is a standardised bedside ultrasound approach to detect free fluid [3][10]. The "extended" version (eFAST) adds thoracic views for pneumothorax and haemothorax.
| eFAST View | Structures Assessed | Pathology Detected |
|---|---|---|
| Subxiphoid (transverse) | Pericardial space, left liver | Pericardial effusion (tamponade), left liver injury [10] |
| Right upper quadrant / perihepatic (longitudinal) | Morison's pouch (hepatorenal recess), right subphrenic, right paracolic gutter | Free intraperitoneal fluid, right liver/kidney injury [10] |
| Left upper quadrant / perisplenic (longitudinal) | Splenorenal space, left subphrenic | Free fluid, splenic/left kidney injury [10] |
| Pelvic (transverse + longitudinal) | Pouch of Douglas / rectovesical space | Free pelvic fluid, bladder injury [10] |
| Bilateral thoracic | Pleural space, lung surface | Pneumothorax (absent lung sliding = "stratosphere sign" on M-mode), haemothorax (anechoic fluid above diaphragm) |
Key eFAST concepts:
- FAST positive (free fluid detected) in an unstable patient → immediate operative intervention (laparotomy or thoracotomy depending on location) [10][17]
- FAST positive in a stable patient → proceed to CT for detailed evaluation [3][10]
- FAST negative does NOT exclude injury → intra-parenchymal lacerations may not produce free fluid [3]. If clinical suspicion remains, proceed to CT.
Diagnostic Peritoneal Lavage (DPL): An older technique largely replaced by FAST/CT, but still useful in haemodynamically unstable patients when FAST is equivocal or unavailable [17]. Positive if: frank blood or bowel content aspirated, or unspun specimen shows RBC ≥ 100,000/mm³ or WCC ≥ 500/mm³ [17]. A negative DPL in a shocked patient may signify retroperitoneal bleeding [17].
Why ECG in chest trauma? Three reasons:
- Detect myocardial contusion: New arrhythmias (sinus tachycardia, AF, PVCs, VT), ST-T changes, new RBBB (because the RV is the most anterior chamber and most vulnerable) [16]
- Rule out ACS as the cause of trauma: ST elevation in a coronary territory suggests MI preceded the injury [12]
- Detect tamponade: Low-voltage QRS, electrical alternans [6]
- Detect PE: S1Q3T3, RV strain pattern (inverted T V1-4, RBBB, RAD), P pulmonale [16]
| ECG Finding | Suggests | Pathophysiological Basis |
|---|---|---|
| Sinus tachycardia | Pain, hypovolaemia, sympathetic response | Most common and least specific finding |
| New RBBB | Myocardial contusion | RV free wall contusion disrupts right bundle conduction |
| ST-T changes (non-territorial) | Myocardial contusion, pericarditis | Diffuse myocardial oedema/inflammation |
| ST elevation (territorial) | ACS (MI) — may be the cause of trauma | Coronary occlusion → transmural ischaemia |
| Low-voltage QRS | Pericardial effusion/tamponade | Fluid around heart attenuates electrical signal [6][16] |
| Electrical alternans | Large pericardial effusion | Heart swings in fluid → alternating QRS axis [6] |
| Diffuse concave-up ST elevation + PR depression | Pericarditis | Diffuse pericardial inflammation [6] |
| S1Q3T3 | PE (may coexist with trauma) | Acute RV strain from pulmonary artery obstruction [16] |
Why ABG in chest trauma?
- Quantifies severity of respiratory compromise (PaO₂, PaCO₂)
- Identifies type of respiratory failure:
- Type 1 RF (↓PaO₂, ↓/N PaCO₂): V/Q mismatch or shunt — pneumothorax, pulmonary contusion, haemothorax
- Type 2 RF (↓PaO₂, ↑PaCO₂): Hypoventilation — flail chest with exhaustion, cervical spinal cord injury, drug overdose
- Lactate: marker of tissue hypoperfusion. Elevated lactate ( > 2 mmol/L) in trauma indicates shock — correlates with injury severity and mortality [16]
- Base deficit: Negative base excess (base deficit > 6) indicates significant haemorrhage/shock and is used as a resuscitation endpoint
| Blood Test | Key Findings in Chest Trauma | Clinical Significance |
|---|---|---|
| CBC | ↓Hb (haemorrhage), ↑WCC (stress response/infection) | Serial Hb monitoring for ongoing bleeding. Initial Hb may be normal despite significant haemorrhage because haemodilution takes time (the "compensated" phase) [16] |
| Coagulation (PT/INR, aPTT, fibrinogen) | ↑PT/INR in massive haemorrhage, DIC | Baseline for resuscitation. Trauma-induced coagulopathy (TIC) occurs in ~25% of major trauma patients — driven by tissue injury + shock + haemodilution + hypothermia + acidosis ("lethal triad": hypothermia, acidosis, coagulopathy) |
| Group and crossmatch (T+S) | — | Essential in ALL trauma patients — anticipate need for blood products |
| Cardiac enzymes (Troponin) | ↑in myocardial contusion, ACS | Troponin may be elevated in any cause of myocardial injury — trauma, contusion, demand ischaemia from shock, or true ACS [12]. Serial measurement helps differentiate (ACS shows typical rise-and-fall pattern) |
| L/RFT | ↑urea/Cr (AKI from shock), ↑ALT/AST (shock liver, hepatic injury), electrolyte disturbance | Monitor for organ dysfunction secondary to hypoperfusion [16] |
| Lactate | ↑ > 2 mmol/L indicates inadequate tissue perfusion | Prognostic marker; serial lactate clearance guides resuscitation adequacy [16] |
| D-dimer | Elevated in trauma (non-specific) | Not useful for ruling out PE in the trauma setting (trauma itself activates coagulation → always elevated). Only useful in non-trauma settings with low pre-test probability [16] |
| Amylase | ↑in pancreatic/duodenal injury, parotid injury | Mildly elevated amylase in trauma may indicate hollow viscus injury [17] |
The 'Lethal Triad' of Trauma
Hypothermia + Acidosis + Coagulopathy = the "lethal triad" or "trauma triad of death." Each element worsens the others in a vicious cycle:
- Hypothermia → impairs clotting enzyme function → worsens coagulopathy
- Acidosis (lactic acid from shock) → impairs clotting factor function → worsens coagulopathy
- Coagulopathy → continued bleeding → worsens hypothermia and acidosis
This is why damage control resuscitation emphasises early blood product replacement (1:1:1 ratio of PRBC:FFP:platelets), permissive hypotension, and prevention of hypothermia.
4.3 Advanced Imaging
CT is the gold standard for evaluating the stable chest trauma patient [3][10][18].
Advantages [3]:
- Fast: completed in ~15 seconds
- Excellent anatomical correlation
- Very high sensitivity for visceral injury, free fluid, free gas, and vascular injury
- No superimposition (unlike plain XR) — 3D images [18]
Contrast phases and their purpose [10]:
| Phase | Timing After Contrast | What It Detects | Why |
|---|---|---|---|
| Arterial phase | ~25-30 seconds | Active bleeding points, pseudoaneurysms, vascular injury | Contrast extravasation = active haemorrhage ("blush"). Pseudoaneurysm shows focal contrast collection within vessel wall |
| Portovenous phase | ~60-70 seconds | Visceral organ injury (most important phase) [10] | Parenchymal organs enhance maximally → lacerations/haematomas appear as non-enhancing defects within enhancing parenchyma |
| Delayed phase | ~5-10 minutes | Urinary extravasation | Contrast has been excreted by kidneys → if renal pelvis/ureter/bladder is injured, contrast leaks outside the urinary tract |
| Lung window | Same scan, different display | Pneumothorax, contusion, atelectasis | Air and lung parenchyma best visualised with lung window settings |
| Bone window | Same scan, different display | Fractures (ribs, spine, sternum, scapula) | Cortical detail best seen with bone window settings |
Specific CT findings by injury:
| Injury | CT Finding | Interpretation |
|---|---|---|
| ATAI | Intimal flap, mediastinal haematoma, periaortic haematoma, pseudoaneurysm, contrast extravasation [3] | CT aortogram is fast with very high sensitivity. True lumen compressed by false lumen; true lumen traceable from normal aorta [11] |
| Pneumothorax | Clearly defined air pocket in pleural space; much more sensitive than CXR (detects "occult" pneumothorax invisible on supine CXR) | Important for identifying small PTX that may expand with positive pressure ventilation (relevant if patient needs GA) |
| Pulmonary contusion | Ground-glass opacification and/or consolidation not respecting lobar boundaries, in distribution of impact | CT detects contusion earlier and with greater sensitivity than CXR — CXR may take 6+ hours to show changes |
| Haemothorax | Hyperdense (30-70 HU) fluid in pleural space (blood is denser than transudate/water at ~0-20 HU) | Can estimate volume and assess for clotted haemothorax |
| Diaphragmatic rupture | Direct discontinuity of diaphragm, herniated viscera above diaphragm, "collar sign" (constriction of herniated organ at the diaphragmatic defect), "dependent viscera sign" (viscera lying against posterior chest wall without diaphragm support) [3] | Coronal and sagittal reconstructions essential for diaphragmatic rupture (axial cuts may miss it) |
| Tracheobronchial injury | Pneumomediastinum, discontinuity of airway wall, "fallen lung sign" (lung falls peripherally because bronchial attachment is lost) | Often requires bronchoscopy for definitive diagnosis |
| Oesophageal perforation | Pneumomediastinum, periesophageal fluid/air, contrast extravasation (with oral contrast) [7] | CT with water-soluble oral contrast is the definitive investigation [7] |
| Myocardial contusion | Often normal CT; may show small pericardial effusion | CT is not the primary diagnostic tool — echo and ECG/troponin are more useful |
| Rib fractures | Cortical break, displacement, callus (if old) | CT detects rib fractures that CXR misses (CXR misses up to 50%) [3] |
- Specific protocol for evaluating the aorta — contrast timed to maximally enhance the aortic lumen [3][11]
- Indicated when CXR shows widened mediastinum or mechanism suggests deceleration injury
- Findings: mediastinal haematoma, intimal flap, pseudoaneurysm, extravasated contrast, displaced oesophagus, bilateral haemothoraces [3]
- For evaluating penetrating injuries where vascular damage is suspected (e.g., penetrating neck wounds) [1]
- For evaluating extremity vascular injury (e.g., absent pulses after penetrating injury)
| Modality | Indication in Chest Trauma | Advantages / Disadvantages |
|---|---|---|
| Echocardiography (TTE/TEE) | Cardiac tamponade (confirms pericardial fluid + chamber collapse), myocardial contusion (wall motion abnormalities), valvular injury, aortic dissection (TEE more sensitive for aortic pathology [11]) | Fast, portable (TTE). TEE more sensitive but requires sedation/intubation. Cannot assess non-cardiac structures |
| Bronchoscopy | Tracheobronchial injury — definitive diagnosis. Also for airway toilet, foreign body removal | Directly visualises the airway tear. May be therapeutic (clearing blood/debris) |
| Contrast swallow (water-soluble) | Oesophageal perforation — confirms site and extent [7] | Use water-soluble contrast first (Gastrografin); barium is used if water-soluble is negative (higher sensitivity but causes severe mediastinitis if it leaks) |
| Angiography (DSA) | ATAI (historical gold standard), vascular injury, embolisation of bleeding vessels | Invasive, catheter-related complications. Now mostly used therapeutically (embolisation) rather than diagnostically (CT has replaced it) [3] |
| MRI | Spinal cord injury assessment, soft tissue detail | Excellent soft tissue contrast but slow, not suitable for unstable patients, difficult to monitor patient in scanner [19] |
| Plain XR (C-spine, pelvis) | Spinal clearance, pelvic fracture | Readily available. C-spine lateral XR must show C7-T1 to detect fractures [3]. Largely replaced by CT in major trauma centres |
5. Integration: Putting It All Together
| Scenario | Investigation Priority | Rationale |
|---|---|---|
| Unstable patient (primary survey) | Clinical diagnosis + bedside FAST → immediate intervention | CT is contraindicated in haemodynamic instability — the patient may arrest in the scanner. Treat first, image later [10][17] |
| Stabilised patient | CXR + eFAST + ECG + bloods → CT whole body with contrast | CT provides definitive diagnosis of all injuries; the multi-phase protocol covers vascular, visceral, and urological injuries [10] |
| Penetrating chest trauma | CXR + eFAST → diagnostic laparoscopy/thoracoscopy ± CT [10] | Penetrating injuries may have missed hollow viscus damage (missed on FAST); low threshold for operative exploration |
| Suspected ATAI (widened mediastinum) | Urgent CT aortogram [3] | 90% die within 4 months if untreated; CT is fast and highly sensitive [3] |
| Suspected tamponade | Bedside FAST/echo → pericardiocentesis or surgical window | Don't wait for formal echo if patient is crashing |
| Blast injury | CXR + CT + audiometry (tympanic membrane) | Blast lung may not be immediately apparent; tympanic membrane rupture is a marker of significant blast exposure |
| Investigation | When to Repeat | Why |
|---|---|---|
| CXR | 6-24 hours post-injury; after chest drain insertion; after any deterioration | Pulmonary contusion worsens over 24-48h [3]; need to confirm drain position; new findings may emerge |
| ABG/Lactate | Every 2-4 hours in critically ill; as guided by clinical status | Serial lactate clearance guides resuscitation; worsening ABG may indicate evolving contusion or ARDS |
| Troponin | Repeat at 6-12 hours if first is normal [12] | Troponin takes 4-6 hours to rise; a single normal value does not exclude myocardial injury |
| Hb | Serial (every 4-6 hours initially) | Initial Hb may be falsely normal; falling trend indicates ongoing haemorrhage |
| CT | If clinical deterioration not explained by initial CT; delayed presentation (e.g., delayed splenic rupture) | New or evolving injuries; cerebral contusions are not worst until day 4-5 [20] |
High Yield Summary
Key Diagnostic Principles:
- Tension PTX is a clinical diagnosis — never wait for imaging. Treat immediately with needle decompression
- Massive haemothorax: defined by > 1500 mL on initial chest drain or > 200 mL/hr for 2-4 hours → thoracotomy
- CXR is first-line imaging but has limitations in supine trauma patients (misses PTX, underestimates haemothorax, may artefactually widen mediastinum)
- eFAST: 5 views — subxiphoid, RUQ, LUQ, pelvis, bilateral thoracic. Positive + unstable = OR. Negative does NOT exclude injury
- CT is the gold standard for the stable patient — multi-phase protocol: arterial (bleeding), portovenous (visceral injury — most important phase), delayed (urinary leak), lung + bone windows
- CXR signs of ATAI: widened mediastinum, loss of aortic knuckle, thickened paratracheal stripe → CT aortogram
- Pneumothorax on supine CXR: deep sulcus sign, double diaphragm sign
- ECG: look for new RBBB (myocardial contusion), electrical alternans (tamponade), STEMI pattern (ACS as cause of trauma)
- Serial investigations are essential: pulmonary contusion worsens over 24-48h, troponin rises over 4-6h, Hb drops with haemodilution
- DPL criteria: RBC ≥ 100,000/mm³ or WCC ≥ 500/mm³ in unspun specimen → positive
Active Recall - Chest Injury Diagnosis
References
[1] Lecture slides: GC 182. Chopped and stabbed wound in gang fight Nerves and vascular injury; Classification of injuries.pdf [3] Senior notes: Ryan Ho Radiology.pdf (Chapter 1: Radiology in Trauma) [4] Senior notes: Maksim Medicine Notes.pdf (p291, Pneumothorax) [5] Senior notes: Ryan Ho Respiratory.pdf (p151-152, Pneumothorax) [6] Senior notes: Ryan Ho Cardiology.pdf (p172, Diseases of Pericardium) [7] Senior notes: Maksim Surgery Notes.pdf (p58-59, Esophageal perforation / Boerhaave's) [10] Senior notes: Maksim Surgery Notes.pdf (p42, Trauma / FAST scan) [11] Senior notes: Maksim Medicine Notes.pdf (p15, Aortic dissection) [12] Senior notes: Ryan Ho Cardiology.pdf (p58 and p131, Acute Chest Pain and Cardiac Biomarkers) [16] Senior notes: Ryan Ho Critical Care.pdf (p17, Shock investigations) [17] Lecture slides: GC 188. Hit by a van, in shock with internal bleeding Abdominal injury.pdf [18] Senior notes: Ryan Ho Diagnostic Radiology.pdf (p13 and p36, Plain Film and CT) [19] Lecture slides: GC 110. Paraplegia Spinal cord compression Transverse myelitis Spinal dysraphism Neuroimaging III Spinal Cord.pdf [20] Senior notes: Ryan Ho Neurology.pdf (p204, Cerebral Contusion)
Management of Chest Injury
Management of chest injury follows a layered, systematic approach rooted in ATLS principles. The beauty of chest trauma management is that the majority of life-threatening chest injuries (~85-90%) can be managed with simple interventions — oxygen, needle decompression, chest drain, and volume resuscitation. Only 10-15% require formal thoracotomy [1][10].
The management framework can be conceptualised in three phases:
- Immediate resuscitation (primary survey) — simultaneous assessment and treatment of immediately life-threatening injuries
- Stabilisation and definitive diagnosis (secondary survey + investigations) — once the patient is no longer dying
- Definitive management — injury-specific treatment, which may be non-operative or operative
The key philosophical principle: "Treat first, investigate later" in the unstable patient. Resuscitation takes priority over diagnosis [2][10].
3. Management by Phase
3.1 Phase 1: Immediate Resuscitation (Primary Survey — ABCDE)
Patients are assessed and treatment priorities established based on their injuries, vital signs, and injury mechanisms. ABCDEs of trauma care: A — Airway and C-spine protection, B — Breathing and ventilation, C — Circulation with haemorrhage control, D — Disability/Neurologic status, E — Exposure/Environmental control [2].
| Intervention | Indication | Technique | Why |
|---|---|---|---|
| Jaw thrust | First-line airway opening in trauma | Lift mandible anteriorly without extending the neck | Displaces tongue from posterior pharynx. Preferred over head-tilt chin-lift in trauma because it does not move the C-spine [21] |
| Suction | Blood, secretions, vomit in airway | Rigid Yankauer suction | Clears airway of obstructing material |
| Oropharyngeal airway (OPA) | Unconscious patient needing BVM | Curved tube over tongue; size from incisor to angle of mandible | Prevents tongue from falling back. NEVER insert in a conscious patient (gag reflex → vomiting → aspiration) [21] |
| Nasopharyngeal airway (NPA) | Semi-conscious patient or trismus | Soft tube through nostril into nasopharynx | Tolerated by semi-conscious patients. C/I in suspected basal skull fracture (risk of intracranial placement) |
| Endotracheal intubation (ETT) | GCS ≤ 8, unable to protect airway, need for ventilation | Gold standard for definitive airway [21]. Rapid sequence induction (RSI) with in-line C-spine stabilisation | Provides definitive airway protection + allows positive pressure ventilation |
| Surgical airway (cricothyroidotomy) | "Can't intubate, can't oxygenate" (CICO) scenario | Needle or surgical cricothyroidotomy through cricothyroid membrane | Emergency rescue airway. Tracheostomy is more definitive but takes longer and is done in a controlled setting |
C-Spine Protection
Every chest trauma patient should be assumed to have a cervical spine injury until proven otherwise. Maintain manual in-line stabilisation (MILS) during all airway manoeuvres. A hard collar alone is insufficient — it restricts but does not eliminate movement. Log-roll for any repositioning [2].
B: Breathing and Ventilation — Management of Immediately Life-Threatening Injuries
| Step | Intervention | Details |
|---|---|---|
| Immediate | Needle decompression | 14G angiocath inserted at 2nd ICS mid-clavicular line (MCL) [4] OR 5th ICS mid-axillary line (MAL) — the latter is preferred in some guidelines due to thinner chest wall at this site. Listen for hissing sound → converts tension PTX to simple open PTX |
| Follow-up | Chest drain insertion | 5th ICS, safety triangle (bounded by lateral border of pectoralis major, anterior border of latissimus dorsi, and a line at the level of the nipple). Use 24Fr for air [4]. Connect to underwater seal |
| Supportive | High-flow O₂ | 15L/min via non-rebreather mask. Promotes absorption of pleural air (O₂ is absorbed ~4× faster than N₂) [4] |
Why 2nd ICS MCL for needle and 5th ICS for drain? The 2nd ICS MCL is easy to find quickly in an emergency (midpoint of clavicle, 2 ribs down). It's a needle — you just need to decompress. The chest drain goes into the safety triangle (5th ICS) because this allows the drain to sit in a good position for continued drainage, and the triangle is safer (avoids the breast, internal mammary artery, and abdominal organs).
O₂ therapy in pneumothorax: avoid HFNC and NIPPV (positive pressure may worsen PTX) [4]. CPAP is a relative contraindication [22].
| Step | Intervention | Details |
|---|---|---|
| Immediate | Three-sided occlusive dressing | Tape an occlusive dressing (e.g., plastic film, Asherman chest seal) on three sides. During expiration, the untaped edge opens → air escapes. During inspiration, the dressing seals against the wound → prevents air entry. This converts an open PTX to a closed one and prevents progression to tension PTX |
| Follow-up | Chest drain (at a SEPARATE site) | Never put the chest drain through the wound (contamination risk). Insert at safety triangle |
| Definitive | Wound debridement and surgical closure | Once the patient is stabilised in the OR |
Why Not a Four-Sided Dressing?
If you seal all four sides, you create a valve mechanism — air can enter the pleural space via the lung laceration during breathing but cannot escape through the sealed wound. This converts an open PTX into a tension PTX — making things much worse. The three-sided dressing is a one-way valve that allows air OUT but not IN.
| Step | Intervention | Details |
|---|---|---|
| Immediate | Large-bore chest drain (28-32Fr) + IV volume resuscitation | Drain blood to re-expand lung + allow autotransfusion. Simultaneously replace circulating volume with warm crystalloid (NS or Hartmann's) 1-2L, then blood products [10] |
| Assess output | Monitor drain volume | > 1500 mL initial drainage → thoracotomy [1]. > 200 mL/hr for 2-4 consecutive hours → thoracotomy |
| Definitive | Emergency thoracotomy if indicated | Identify and control the bleeding source (intercostal artery ligation, internal mammary artery repair, lung tractotomy, great vessel repair) |
| Supportive | Massive transfusion protocol (MTP) | 1:1:1 ratio of PRBC:FFP:platelets. Aim to correct the "lethal triad" (hypothermia, acidosis, coagulopathy). Tranexamic acid 1g IV loading within 3 hours of injury [23] |
Why autotransfusion? Blood collected from a fresh haemothorax can be returned to the patient through autotransfusion devices. This is the patient's own blood — no crossmatch needed, no transfusion reaction risk, and it's immediately available.
| Step | Intervention | Details | Rationale |
|---|---|---|---|
| Analgesia | Epidural or paravertebral nerve block (gold standard) | Thoracic epidural with continuous infusion of local anaesthetic ± opioid. Alternative: intercostal nerve blocks, IV PCA with opioids | Pain is the biggest enemy — it causes splinting → hypoventilation → atelectasis → pneumonia → respiratory failure. Excellent regional analgesia breaks this cycle [1] |
| Oxygenation | Supplemental O₂ | Titrate to SpO₂ > 94% | Compensate for V/Q mismatch from contusion |
| Ventilation | Positive pressure ventilation (PPV) if needed | Via CPAP/BiPAP (non-invasive) or ETT + mechanical ventilation (invasive) | PPV provides "internal pneumatic splinting" — the positive pressure holds the flail segment in position + recruits atelectatic alveoli + reduces shunt from contusion [22] |
| Fluid management | Judicious IV fluids | Avoid fluid overload | Contused lung is already oedematous — excess fluid worsens pulmonary oedema and ARDS development |
| Physiotherapy | Chest physiotherapy | Incentive spirometry, deep breathing exercises, assisted coughing | Prevents atelectasis and sputum retention |
| Surgical fixation | Rib fixation (selected cases) | Open reduction and internal fixation of fractured ribs with plates/splints | Reserved for patients failing to wean from ventilator, severe chest wall deformity, or planned thoracotomy for other indications. Evidence increasingly supports early fixation in selected patients |
C: Circulation with Haemorrhage Control
| Step | Intervention | Details |
|---|---|---|
| Immediate | Pericardiocentesis (bridge to definitive surgery) | Subxiphoid approach: 15cm 18G needle inserted at 45° to skin, directed toward left shoulder tip, under ECG or USS guidance. Aspirate blood — even 20-50 mL can dramatically improve haemodynamics (because the non-distensible pericardium means small volumes have huge effects on pressure) |
| If pericardiocentesis fails or reaccumulates | Pericardial window or emergency thoracotomy | Subxiphoid pericardial window creates a drainage path. Emergency thoracotomy allows direct cardiac repair |
| Definitive | Surgical repair of cardiac injury | Median sternotomy or left anterolateral thoracotomy. Repair the cardiac wound (usually RV — most anterior chamber) |
| Supportive | Aggressive IV fluid resuscitation | Preload-dependent state — the patient needs high filling pressures to overcome the compressive effect of pericardial blood. Avoid drugs that decrease preload (nitrates, diuretics) |
Why Does Even 20 mL Make a Difference?
The pericardium in acute tamponade is operating on the steep part of the pressure-volume curve. At normal volumes (15-50 mL), the pericardium is compliant. But once the pericardial space is full, even a tiny additional volume causes a massive increase in pressure (because the fibrous pericardium has reached its distensibility limit). Conversely, removing even a small amount drops the pressure dramatically. This is why pericardiocentesis is so effective as a temporising measure.
Resuscitation highlights [10]:
| Resuscitation Concept | Explanation |
|---|---|
| Damage control resuscitation | Permissive hypotension (target SBP 80-90 mmHg until surgical haemorrhage control), 1:1:1 blood products, avoid crystalloid overload, prevent/treat the lethal triad |
| Massive Transfusion Protocol (MTP) | Activated when > 10 units PRBC expected in 24h OR > 4 units in 1h. Pre-packed coolers of PRBC:FFP:platelets in 1:1:1 ratio |
| Tranexamic acid (TXA) | 1g IV loading dose within 3 hours of injury, then 1g over 8 hours [23]. Mechanism: inhibits plasminogen activation → reduces fibrinolysis → stabilises clot. CRASH-2 trial showed significant reduction in mortality from bleeding when given within 3 hours |
| Permissive hypotension | Maintaining SBP 80-90 mmHg (rather than targeting normal BP) until surgical haemorrhage control is achieved. Rationale: aggressive fluid resuscitation before haemostasis can "pop the clot" by raising BP and diluting clotting factors |
- GCS assessment
- Pupil responses
- Identify associated head/spinal cord injury
- Complete undressing for head-to-toe examination
- Prevent hypothermia (warm blankets, warm IV fluids, warm environment) — hypothermia worsens coagulopathy
After addressing all immediately life-threatening injuries:
- Complete secondary survey: head-to-toe examination including log roll [2]
- Adjunct investigations: CXR, eFAST, ECG, bloods, ± CT whole body [10]
- Continuous monitoring: BP/P, SpO₂, cardiac monitor, urine output, temperature
- Reassess and repeat primary survey — the patient's condition can change rapidly
3.3 Phase 3: Definitive Management by Specific Injury
| Scenario | Management | Rationale |
|---|---|---|
| Small ( < 2 cm), asymptomatic, no need for PPV | Observation + high-flow O₂ + serial CXR | Small traumatic PTX may resolve with O₂ therapy alone. O₂ promotes reabsorption by reducing partial pressure of nitrogen in blood — creates a gradient for nitrogen to move from pleural space into blood [4] |
| Large (≥ 2 cm) or symptomatic | Chest drain [4] | Air needs active drainage; unlikely to reabsorb quickly enough |
| Patient going to theatre/needing PPV | Chest drain BEFORE intubation | PPV can convert a simple PTX to a tension PTX — the positive pressure forces more air into the pleural space through the lung defect |
| Bilateral PTX | Chest drain bilaterally [4] | No functioning lung to compensate |
| Scenario | Management | Rationale |
|---|---|---|
| Small, stable | Chest drain (28-32Fr) + monitoring | Larger bore drain needed because blood clots can block smaller drains. Drains blood → re-expands lung + monitors for ongoing bleeding |
| Retained/clotted haemothorax | VATS (video-assisted thoracoscopic surgery) or intrapleural fibrinolytics (tPA) | Undrained blood → organises → fibrothorax → trapped lung. Early VATS (within 3-5 days) is preferred to lyse clots and drain completely |
| Phase | Management | Details |
|---|---|---|
| Immediate | Anti-impulse therapy | IV beta-blocker (esmolol/labetalol) to target HR < 80 bpm and SBP 100-120 mmHg. This reduces the rate of rise of aortic pressure (dP/dt) — the shear force that propagates the tear. Same principle as medical management of aortic dissection [11] |
| Definitive | Thoracic endovascular aortic repair (TEVAR) — now first-line [3] | Endovascular stent-graft placed across the injury site via femoral artery. Less invasive than open surgery, lower paraplegia risk, shorter recovery. Replaced open repair as the standard of care for most ATAI |
| Alternative | Open surgical repair | Reserved for patients not suitable for TEVAR (e.g., anatomical constraints, very young patients where long-term stent durability is uncertain). Involves left thoracotomy, cross-clamp aorta, graft interposition |
80-90% of ATAI patients die at the scene. Of those reaching hospital, 30% die within 6 hours, 50% within 24 hours, 90% within 4 months if untreated [3]. This underscores the urgency of diagnosis and treatment.
| Phase | Management | Details |
|---|---|---|
| Airway control | Intubation (may need bronchoscopic guidance to place ETT beyond the injury) | Conventional intubation may worsen the injury or fail to ventilate the affected lung |
| Drainage | Chest drain (may need multiple drains or large-bore due to massive air leak) | Controls the pneumothorax even if persistent air leak continues |
| Definitive | Surgical repair (bronchial repair or resection) | Usually performed via thoracotomy. Small tears may heal conservatively with adequate drainage |
| Phase | Management | Details |
|---|---|---|
| Supportive | NPO, IV fluids, broad-spectrum antibiotics [7] | Prevents ongoing contamination of mediastinum; treats established/incipient mediastinitis |
| Early ( < 4-6h) | Primary surgical repair [7] | Direct repair with tissue flap reinforcement (intercostal muscle, pleural, diaphragmatic flap). Best outcomes when repaired early |
| Late ( > 24h) | Damage control: T-tube drainage, endo-vac therapy, wide drainage ± eventual oesophagectomy with delayed reconstruction [7] | Late presentations have established mediastinitis and tissue necrosis → primary repair often fails |
| Conservative | Cameron's criteria: contained perforation with no sepsis, draining back into oesophagus | NPO, TPN/feeding jejunostomy, broad-spectrum antibiotics, drainage [7] |
| Phase | Management | Details |
|---|---|---|
| Acute | Surgical repair | Abdominal approach (laparotomy) preferred in acute setting — allows inspection of abdominal viscera for concurrent injury. Repair with direct suture ± mesh reinforcement |
| Delayed/chronic | Thoracic approach (thoracotomy/VATS) | In delayed presentations, adhesions between herniated viscera and thoracic structures are better addressed from above |
| Emergency | If strangulation of herniated viscera → immediate laparotomy | Herniated bowel can strangulate → ischaemia → gangrene → sepsis [3] |
| Phase | Management | Details |
|---|---|---|
| Monitoring | Continuous ECG monitoring for 24-48 hours in ICU/CCU | Risk of arrhythmias (VT, VF, AF, heart block) — most dangerous in the first 24 hours |
| Arrhythmias | Treat per ACLS protocols | Antiarrhythmics (amiodarone for VT/VF), atropine/pacing for bradycardia |
| Pump failure | Inotropes (dobutamine) if cardiogenic shock | Rarely needed; indicates severe contusion |
| Imaging | Echocardiography | Wall motion abnormalities, pericardial effusion, valvular injury |
| Component | Management | Rationale |
|---|---|---|
| Analgesia | Multimodal: paracetamol + NSAIDs + opioids (oral or PCA). Consider intercostal nerve block or thoracic epidural for multiple fractures | Adequate pain control → patient can breathe deeply and cough → prevents atelectasis and pneumonia. NSAID caution: avoid if pleurodesis planned (anti-inflammatory action inhibits the inflammatory adhesion process essential for pleurodesis) [4] |
| Respiratory physiotherapy | Deep breathing exercises, incentive spirometry, assisted coughing | Prevents sputum retention, atelectasis, secondary pneumonia |
| Activity | Early mobilisation | Bed rest → atelectasis → pneumonia (especially in elderly) |
| Monitoring | Serial CXR, SpO₂ | Watch for delayed complications: pneumothorax, haemothorax, contusion evolution |
Rib fractures do NOT require treatment on their own [3]. Their significance is as a marker of associated injuries (upper ribs → great vessel, lower ribs → abdominal organs) and as a cause of pain-related respiratory compromise.
4. Special Procedures in Detail
Indications [4]:
- Pneumothorax: haemodynamically unstable, bilateral PTX, PSP ≥ 2 cm or symptomatic, SSP ≥ 1 cm or symptomatic
- Haemothorax / chylothorax
- Pleural effusion: bilateral effusion failing medical treatment, malignancy, complicated parapneumonic effusion / empyema
- Post-operative: thoracic/cardiac surgery, thoracoscopy
- Instillation of agents (e.g., talc, tPA)
Technique [4]:
| Step | Detail |
|---|---|
| 1. Pre-medication | IM pethidine 50mg for analgesia |
| 2. Position | Supine at 45°, arm behind head (opens up rib spaces) |
| 3. Site | Safety triangle: 5th ICS, bounded by lateral border of pectoralis major anteriorly, anterior border of latissimus dorsi posteriorly |
| 4. Size | Smaller for air (24Fr), larger for blood/pus (28-32Fr) — trocar NOT recommended (risk of organ injury) |
| 5. Aseptic technique | Chlorhexidine skin preparation, sterile draping |
| 6. Local anaesthesia | Infiltrate all layers of thoracic wall including the pleura. Aspirate each layer before injection to ensure not in a vessel. Aspirate pleural cavity to confirm air/fluid before inserting drain |
| 7. Incision | Just above the rib (to avoid the intercostal neurovascular bundle — VAN — running along the inferior border of the rib above) |
| 8. Blunt dissection | Through muscles and pleura with artery forceps (finger sweep to confirm pleural space) |
| 9. Insert drain | Aim apical for air, basal for fluid |
| 10. Connect | Immediately connect to underwater seal (2 cm H₂O) with bottle at least 1m below patient level |
| 11. Confirm | Ask patient to cough/breathe deeply; check for swinging. Secure with suture (purse-string or anchor stitch). Confirm position with CXR |
Three-bottle chest drain system [4]:
| Chamber | Function | Parameters |
|---|---|---|
| A: Suction control | Limits suction force by depth of tube in water | Height of water column = negative pressure transmitted to chest |
| B: Underwater seal (2cm H₂O) | One-way valve to prevent back-leak of air during inspiration | — |
| C: Air leak monitor | Blue ball rises on inspiration, drops on expiration | Swinging (normal respiratory variation), bubbling (air leak present) |
| D: Collection | Collects drained fluid | Monitor colour and volume |
Removal criteria [4]:
- No air leak (no bubbling) for > 24 hours
- Fluid output < 150-200 mL/day
- Lung fully re-expanded on CXR
- Remove during expiration or Valsalva (to prevent air entry)
This is a last-resort, heroic procedure performed in the emergency department or operating theatre.
Indications:
- Penetrating chest trauma with witnessed cardiac arrest or agonal rhythms (best outcomes — survival up to 35% for isolated stab wound to heart)
- Blunt trauma with cardiac arrest (very poor outcomes — survival < 2%)
- Massive haemothorax not responding to chest drain and resuscitation
- Cardiac tamponade not responding to pericardiocentesis
Approach: Left anterolateral thoracotomy (5th intercostal space) — allows:
- Opening the pericardium to relieve tamponade
- Direct cardiac massage (open CPR is more effective than closed chest compressions)
- Cross-clamping the descending aorta (redirects blood to heart and brain)
- Clamping the pulmonary hilum (stops massive pulmonary haemorrhage)
- Identification and repair of cardiac/great vessel injuries
Contraindications:
- Blunt trauma with no signs of life and prolonged CPR (futile)
- Patients with multiple severe injuries and no chance of meaningful survival
Technique (subxiphoid approach):
- Patient semi-recumbent at 45° (pools blood inferiorly)
- 18G spinal needle attached to syringe, inserted 1-2 cm below and to the left of the xiphoid process
- Directed at 45° toward the left shoulder tip
- Advance slowly while aspirating — ECG monitoring (ST elevation or ectopics suggest needle touching myocardium → withdraw slightly)
- Aspirate as much blood as possible — even 20 mL can be dramatically effective
- Can leave a catheter in situ for continued drainage (Seldinger technique)
Limitations: Blood in tamponade often clots → difficult to aspirate. Pericardiocentesis is a bridge to definitive surgery, not definitive treatment.
| Modality | Indication | Mechanism | Contraindications/Cautions |
|---|---|---|---|
| High-flow O₂ (non-rebreather) | All chest trauma patients initially | Maximises FiO₂ (up to 0.85), promotes PTX reabsorption | — |
| CPAP | Chest wall trauma (flail chest) [22], APO | Provides continuous positive pressure → "internal pneumatic splinting" of flail segment + recruits atelectatic alveoli | Untreated pneumothorax (insert chest drain first!), haemodynamic instability, facial/upper airway trauma [22] |
| BiPAP | T2RF secondary to chest wall/neuromuscular injury | IPAP reduces CO₂, EPAP maintains alveolar recruitment | Same as CPAP; avoid in uncooperative/vomiting patient [22] |
| Mechanical ventilation (invasive) | Severe respiratory failure despite NIV, GCS ≤ 8, need for surgery | Full ventilatory support via ETT | Use low tidal volume (6-8 mL/kg) to prevent barotrauma/volutrauma — especially important in contused lungs (risk of ARDS progression) |
| ECMO | Refractory hypoxaemia despite maximal ventilatory support | Extracorporeal membrane oxygenation — blood is oxygenated outside the body | Available only in specialised centres. Consider in severe pulmonary contusion/ARDS |
| Drug | Indication in Chest Trauma | Dose/Route | Mechanism | Key Points |
|---|---|---|---|---|
| Tranexamic acid (TXA) | Haemorrhagic shock / significant bleeding | 1g IV over 10 min within 3 hours, then 1g over 8h | Inhibits plasminogen → reduces fibrinolysis → stabilises clot | CRASH-2 trial: ↓mortality if given within 3h. No benefit and possible harm if given after 3h [23] |
| Morphine / Fentanyl | Severe pain | IV titration | μ-opioid receptor agonist → analgesia + anxiolysis | Caution: respiratory depression, hypotension. Use with naloxone availability |
| Paracetamol | Baseline analgesia (multimodal) | 1g IV/PO Q6H | Central COX inhibition + serotonergic pathway modulation | Safe ceiling of 4g/day; hepatotoxic in overdose |
| NSAIDs (ketorolac) | Rib fracture pain | 30mg IV or 10mg PO | COX inhibition → ↓prostaglandins → ↓inflammation and pain | Avoid if pleurodesis planned (pleurodesis requires inflammation) [4]. Avoid in renal impairment/hypovolaemia |
| Local anaesthetics (bupivacaine) | Epidural/paravertebral/intercostal blocks | Titrated to effect | Blocks voltage-gated Na⁺ channels → prevents nerve impulse propagation | Gold standard analgesia for multiple rib fractures and flail chest |
| Beta-blockers (esmolol/labetalol) | ATAI / aortic dissection | IV infusion, titrate to HR < 80 and SBP 100-120 | ↓HR and ↓dP/dt → ↓shear force on aortic wall | Must achieve HR control before adding vasodilators (vasodilators alone cause reflex tachycardia → ↑shear force) [11] |
| Antibiotics (cefuroxime ± metronidazole) | Open/penetrating wounds, oesophageal perforation | IV | Prevent wound infection and mediastinitis | Plus tetanus prophylaxis for all open wounds [24] |
| Tetanus prophylaxis | All open/penetrating chest wounds | IM tetanus toxoid ± immunoglobulin depending on vaccination status | Active immunisation (toxoid) ± passive immunisation (immunoglobulin) | Check vaccination status; if unknown or incomplete, give both toxoid and immunoglobulin [24] |
| Injury | Non-Operative Management | Operative Management |
|---|---|---|
| Simple PTX | O₂, observation, aspiration, chest drain | Rarely needed (only for persistent air leak) |
| Tension PTX | Needle decompression → chest drain | Only if drain fails or underlying pathology needs surgery |
| Massive haemothorax | Chest drain + volume resuscitation | Thoracotomy if > 1500 mL initial or > 200 mL/hr |
| Cardiac tamponade | Pericardiocentesis (temporary bridge) | Pericardial window or thoracotomy (definitive) |
| ATAI | Anti-impulse therapy (bridge) | TEVAR (1st line) or open repair |
| Flail chest | Analgesia + NIV/MV (most patients) | Rib fixation (selected cases — failure to wean, severe deformity) |
| Pulmonary contusion | O₂, judicious fluids, MV if needed | Not typically surgical |
| Tracheobronchial injury | Small tears may heal with drain alone | Surgical repair for large/complete disruptions |
| Oesophageal injury | Cameron's criteria (contained, no sepsis) | Primary repair ( < 4-6h) or damage control (late) |
| Diaphragmatic rupture | Not appropriate — will not heal spontaneously | Surgical repair always needed |
| Rib fractures | Analgesia + physiotherapy (standard of care) | Fixation only in selected cases |
Damage control surgery (DCS) is a staged approach for the physiologically decompensated patient (the "lethal triad" of hypothermia, acidosis, coagulopathy):
| Stage | Action | Rationale |
|---|---|---|
| Stage 1 | Abbreviated surgery — control haemorrhage (packing, ligation), control contamination (staple off bowel leaks), temporary closure | Stop the bleeding and contamination. The patient is too sick for a prolonged definitive operation |
| Stage 2 | ICU resuscitation — warm the patient, correct acidosis, replace blood products, correct coagulopathy | Restore physiology before returning to the OR |
| Stage 3 | Definitive repair — return to OR in 24-48 hours for definitive reconstruction | Patient is now physiologically stable enough to tolerate a longer operation |
High Yield Summary
Management Framework:
- ATLS Primary Survey (ABCDE) with simultaneous resuscitation. Treat life-threats as you find them.
- 85-90% of chest injuries managed with simple procedures: O₂, needle decompression, chest drain, volume resuscitation. Only 10-15% need thoracotomy.
Key Interventions:
- Tension PTX → Needle decompression (14G, 2nd ICS MCL or 5th ICS MAL) → Chest drain
- Open PTX → Three-sided dressing → Chest drain at separate site
- Massive haemothorax → Chest drain (28-32Fr) + volume. Thoracotomy if > 1500 mL initial or > 200 mL/hr
- Cardiac tamponade → Pericardiocentesis (subxiphoid) → Pericardial window/thoracotomy
- Flail chest → Analgesia (epidural) + O₂ + PPV if needed. Internal pneumatic splinting
- ATAI → Anti-impulse therapy (beta-blocker) → TEVAR (first line)
Pharmacology:
- TXA 1g IV within 3 hours (CRASH-2)
- Avoid HFNC/NIPPV in untreated PTX
- Avoid NSAIDs if pleurodesis planned
- Beta-blocker before vasodilator in ATAI
Chest Drain:
- Safety triangle, 5th ICS. Just above the rib (avoid VAN). 24Fr for air, 28-32Fr for blood/pus
- Connect to underwater seal. Remove when no air leak, output < 150 mL/day, lung expanded
Damage Control:
- Lethal triad (hypothermia + acidosis + coagulopathy) → abbreviated surgery → ICU resuscitation → definitive repair
- MTP: 1:1:1 PRBC:FFP:platelets
Active Recall - Chest Injury Management
References
[1] Lecture slides: GC 182. Chopped and stabbed wound in gang fight Nerves and vascular injury; Classification of injuries.pdf [2] Lecture slides: GC 175. A bus hit a train Multiple trauma; Disaster management.pdf [3] Senior notes: Ryan Ho Radiology.pdf (Chapter 1: Radiology in Trauma) [4] Senior notes: Maksim Medicine Notes.pdf (p291-295, Pneumothorax and Chest Drain) [7] Senior notes: Maksim Surgery Notes.pdf (p58-59, Esophageal perforation / Boerhaave's) [10] Senior notes: Maksim Surgery Notes.pdf (p42, Trauma / FAST scan) [11] Senior notes: Maksim Medicine Notes.pdf (p15, Aortic dissection) [21] Senior notes: Ryan Ho Critical Care.pdf (p7, Airway Management) [22] Senior notes: Maksim Medicine Notes.pdf (p286, NIV / BiPAP / CPAP) [23] Senior notes: Maksim Surgery Notes.pdf (p355-356, Head injury management — TXA / CRASH trials) [24] Senior notes: Maksim Surgery Notes.pdf (p213, Principles of Trauma Management — Anti-sepsis)
Complications of Chest Injury
Complications of chest trauma can be understood as the downstream consequences of either the initial injury itself or the interventions used to treat it. They span from the immediate (occurring within minutes to hours) to the late (weeks to months), and from the local (confined to the thorax) to the systemic (affecting the whole body). Understanding why each complication occurs — from first principles — helps you anticipate, prevent, and recognise them early.
The framework for thinking about complications:
- Early complications (minutes to days) — related to the primary injury and acute physiology
- Delayed/subacute complications (days to weeks) — related to evolving injury, treatment effects, and immobility
- Late complications (weeks to months) — related to healing, scarring, and long-term sequelae
1. Early Complications (Minutes to Days)
1.1 Respiratory Complications
This is the single most important respiratory complication of chest trauma. Think of ARDS as the lung's "final common pathway" response to severe insult.
- Why does chest trauma cause ARDS? Severe pulmonary contusion → direct lung injury → disruption of the alveolocapillary membrane → inflammatory cascade → neutrophilic infiltration → diffuse alveolar damage (DAD) → increased capillary permeability → exudate accumulation → alveolar and interstitial oedema → loss of surfactant → alveolar collapse → intrapulmonary shunt → refractory hypoxaemia [9][25].
- Indirect lung injury can also trigger ARDS: sepsis, shock, massive transfusion (TRALI — transfusion-related acute lung injury), fat embolism, pancreatitis [9][25].
- Timeline: Pulmonary contusion evolves over 24-48 hours [3]. ARDS typically develops within 7 days of the inciting event (Berlin criteria).
- Berlin criteria for ARDS: (1) Acute onset ≤ 7 days of worsening respiratory symptoms, (2) Bilateral opacities on CXR not fully explained by effusions/collapse/nodules, (3) Not fully explained by cardiac failure/fluid overload (PCWP < 18 mmHg), (4) PaO₂/FiO₂ ratio: mild 200-300, moderate 100-200, severe < 100 [25].
- Clinical course: Exudative phase (≤ 7 days) → fibroproliferative phase ( > 7 days) → some patients develop fibrotic lung changes requiring long-term oxygen therapy [9].
- Management: Treat underlying cause, low tidal volume ventilation (6-8 mL/kg IBW) to avoid barotrauma/volutrauma + high PEEP (open lung approach), prone positioning, judicious fluids, ± ECMO [9][25].
Why Low Tidal Volume?
Damaged lungs have heterogeneous compliance — some areas are consolidated/collapsed ("baby lung") and cannot inflate, while others are relatively normal. If you deliver a normal tidal volume (10-12 mL/kg), the entire volume is directed into the smaller remaining functional lung → overdistension → volutrauma → further inflammatory cascade → worsens ARDS. By using 6-8 mL/kg, you protect the functional lung at the cost of higher CO₂ (permissive hypercapnia) — acceptable because the lungs heal faster [9].
- Why? Multiple mechanisms:
- Pain → splinting → hypoventilation → atelectasis → sputum retention → bacterial colonisation — this is the classic pathway for rib fracture patients [3][26]
- Intubation → bypasses upper airway defences → direct access for bacteria → ventilator-associated pneumonia (VAP)
- Aspiration — altered consciousness (concurrent head injury, alcohol, sedation), supine position, impaired cough reflex
- Pulmonary contusion — damaged lung parenchyma is an excellent culture medium for bacteria
- Each additional rib fracture in elderly patients increases pneumonia risk by ~27% and mortality by ~19% — this is why aggressive analgesia and chest physiotherapy are so critical
- Prevention: Early mobilisation, chest physiotherapy, incentive spirometry, adequate analgesia (especially epidural/paravertebral block), VAP bundle (head elevation 30-45°, oral hygiene, daily sedation holds, spontaneous breathing trials), DVT prophylaxis [26]
- Treatment: Empirical antibiotics according to local antibiogram, escalation guided by sputum cultures
- Why? Pain-induced splinting → shallow breathing → alveolar collapse, especially in dependent lung zones. Also caused by mucus plugging (poor cough due to pain), compression by haemothorax/effusion, or bronchial obstruction by blood clots.
- CXR: Opacification with volume loss (displaced mediastinum toward the atelectasis, elevated hemidiaphragm, reduced rib spaces on the affected side) [25].
- Prevention/Treatment: Analgesia + chest physiotherapy + incentive spirometry + early mobilisation. Consider bronchoscopy for refractory lobar collapse from mucus plugging.
- Definition: Air leak persisting ≥ 5 days despite chest drain [4].
- Why? The air leak source (lung laceration, bronchial tear) fails to seal — ongoing communication between the airway and pleural space. Can also occur post-operatively after lung resection.
- Consequences: The lung cannot fully re-expand (unexpandable lung) → persistent pneumothorax → ongoing need for chest drain → increased infection risk, prolonged hospitalisation.
- Management [4]:
- Continue chest drain with low wall suction (to promote apposition of visceral and parietal pleura → sealing)
- CT thorax to localise the lesion
- Endobronchial valve (EBV): a one-way valve placed bronchoscopically to intentionally collapse the affected lobe → removes 6 weeks after recovery [4]
- Pleurodesis (surgical or chemical) to obliterate the pleural space [4]
- NEVER clamp a drain with a persistent air leak — risk of tension pneumothorax [4]
- Why? When a collapsed lung is rapidly re-expanded (e.g., after drainage of a large pneumothorax or haemothorax), blood flow is suddenly restored to previously compressed and damaged capillaries → capillary damage with leakage → non-cardiogenic pulmonary oedema in the re-expanded lung [5].
- Risk factors: Lung collapse > 3 days, high-volume drainage ( > 1-1.5L at once), early suction use [5].
- Clinical features: Cough, dyspnoea, desaturation that improves upon clamping the drain. CXR shows alveolar shadowing in the re-expanded lung [5].
- Prevention: Drain ≤ 1-1.5L at once and ≤ 500 mL per 8 hours [5]. Avoid early high-pressure suction. Re-expand the lung gradually.
- Management: Supportive + clamp drain [5].
1.2 Cardiovascular Complications
- Why? Ongoing blood loss from intercostal vessels, internal mammary artery, pulmonary vessels, great vessels, or associated abdominal injuries (splenic/hepatic laceration).
- The lethal triad (hypothermia + acidosis + coagulopathy) creates a vicious cycle: hypothermia impairs clotting enzyme function → ongoing bleeding → more hypothermia + acidosis → more coagulopathy [24].
- Trauma-induced coagulopathy (TIC): Occurs in ~25% of major trauma patients. Driven by tissue injury, shock, haemodilution, hypothermia, acidosis, and consumption of clotting factors. Worsened by massive crystalloid resuscitation (dilutes clotting factors).
- Monitor: Serial Hb, coagulation profile, lactate, base deficit, temperature. TEG/ROTEM (thromboelastography) provides point-of-care assessment of clot formation and lysis.
- Why? Myocardial contusion → electrical instability of injured myocardium → arrhythmias. The right ventricle is most commonly contused (most anterior chamber).
- Types: Sinus tachycardia (most common, usually benign), AF, PVCs, VT/VF (most dangerous), heart block (rare — implies severe contusion involving the conduction system).
- Timeline: Most arrhythmias manifest within the first 24-48 hours — this is why ICU monitoring is recommended.
- Management: Per ACLS protocols. Serial ECG, continuous cardiac monitoring, troponin monitoring.
- Even after initial pericardiocentesis, blood can re-accumulate (the hole in the heart is still leaking). Pericardiocentesis is a temporising bridge, not definitive management — definitive treatment requires surgical repair (pericardial window or thoracotomy) [1].
- Early pericarditis (days): Direct inflammation of the pericardium from the injury itself or from adjacent pulmonary contusion.
- Dressler's syndrome (post-cardiac injury syndrome): Occurs weeks to months after cardiac injury (trauma, surgery, MI). Mechanism: autoimmune response — injury releases cardiac antigens into the pericardial space → immune sensitisation → delayed pericarditis + pleural effusion [12].
- Clinical features: Persistent fever, pleuritic chest pain relieved by sitting forward, pericardial rub, ↑CRP/ESR, pericardial ± pleural effusion [12].
- Management: High-dose aspirin/NSAIDs + colchicine ± steroids [12].
- Why? Long bone fractures (especially femur, pelvis) release fat globules from the bone marrow into the venous circulation → lodge in pulmonary capillaries → biochemical injury (free fatty acids are directly cytotoxic to the pulmonary endothelium) + mechanical obstruction [24].
- Timeline: Typically 24-72 hours after fracture.
- Classic triad: Respiratory distress (most common), petechial rash (pathognomonic — usually on upper body, axillae, conjunctivae), neurological changes (confusion, agitation) [24].
- Diagnosis: Clinical (Gurd's criteria). CXR may show bilateral diffuse infiltrates ("snowstorm" appearance). CT brain may show multiple small infarcts.
- Prevention: Early fracture fixation (reduces ongoing fat release from fracture site), gentle handling of fractures, adequate resuscitation.
- Management: Supportive — oxygen, ventilatory support, IV fluids. No specific treatment.
- Why? Virchow's triad is fully activated in trauma: (1) Stasis — immobilisation, bed rest; (2) Endothelial injury — direct vascular damage; (3) Hypercoagulability — tissue factor release, acute phase response, massive transfusion [26].
- PE is a leading cause of preventable death in hospitalised trauma patients.
- Prevention: Mechanical (graduated compression stockings, intermittent pneumatic compression) + pharmacological (low-dose SC heparin/LMWH once haemostasis is secured — typically 24-48h post-injury or post-surgery) [26].
1.3 Complications of Interventions
| Complication | Why It Happens | How to Recognise/Manage |
|---|---|---|
| Malposition | Drain tip outside pleural space (subcutaneous, intra-abdominal, intra-fissural) | Not draining, no swinging. CXR confirms malposition → reposition or replace |
| Pneumothorax (iatrogenic) | Lung lacerated during insertion | Air seen on CXR post-insertion where there was none before |
| Haemothorax (iatrogenic) | Intercostal neurovascular bundle damaged (insertion too close to inferior rib border) | Blood drainage increases post-insertion. Prevention: always insert just ABOVE the rib [4] |
| Organ perforation | Liver, spleen, or stomach penetrated (especially if diaphragm elevated or hernia present) | Acute deterioration, peritoneal irritation. Prevention: confirm pleural space with LA needle aspiration before inserting drain [4] |
| Blockage | Blood clot or fibrin blocks the drain lumen | Loss of swinging, no drainage. Flush with 10 mL sterile NS [5]. May need replacement |
| Dislodgement | Drain slips out or migrates | Loss of swinging, subcutaneous emphysema, pneumothorax recurrence. Secure with adequate suturing |
| Subcutaneous emphysema | Air tracks along the drain site into subcutaneous tissues | "Bubble-wrap" sensation on palpation [3]. Usually self-limiting. If extensive → may compromise upper airway → subcutaneous drains or large-bore drain re-insertion [5] |
| Empyema | Bacterial contamination via the drain | Fever, purulent drain output, raised WCC/CRP. Treat with antibiotics + drain if not already draining. Prevention: strict aseptic technique |
| Re-expansion pulmonary oedema | Rapid re-expansion (see above) | Cough, desaturation after drainage. Limit drainage volume [5] |
| Complication | Why |
|---|---|
| Surgical site infection / wound dehiscence | Contaminated wounds (penetrating trauma), immunocompromise, poor nutritional status |
| Post-operative haemorrhage | Reactionary (within 24h — stress response masked the bleeder) or secondary (7-10 days — infection erodes a vessel) [26] |
| Post-operative atelectasis / pneumonia | Pain → splinting → hypoventilation. Anaesthetic agents depress mucociliary clearance |
| Intercostal neuralgia / chronic pain | Surgical damage to intercostal nerves during thoracotomy. Can be disabling — thoracoscopic (VATS) approaches cause less chronic pain |
| Bronchopleural fistula | Surgical disruption of bronchial stump/lung parenchyma with ongoing air leak |
| Chylothorax | Damage to the thoracic duct during surgery → leakage of chyle (milky fluid) into the pleural space. Management: conservative with medium-chain triglyceride diet initially; surgery if fails [27] |
2. Delayed/Subacute Complications (Days to Weeks)
- Why? Retained haemothorax → excellent culture medium for bacteria → secondary infection → empyema (infected pleural collection). Also from direct contamination (penetrating wound, oesophageal perforation).
- Timeline: Typically develops 3-7 days after the initial injury if blood is not adequately drained.
- Prevention: Early and complete drainage of haemothorax. Early VATS for retained/clotted haemothorax (ideally within 3-5 days).
- Management: Chest drain (large bore, 28-32Fr) + IV antibiotics. If loculated → intrapleural fibrinolytics (tPA + DNase) or VATS decortication.
- Why? Inadequately drained haemothorax → blood organises → fibrous peel forms on the visceral pleura → the lung cannot re-expand ("trapped lung") [4].
- Lung entrapment: Active disease (e.g., malignancy, ongoing infection) prevents lung expansion; pleural fluid is exudative.
- Trapped lung: Remote inflammatory condition (e.g., organised haemothorax) has resolved but left behind a fibrous peel; pleural fluid is transudative [4].
- Consequence: Restrictive lung physiology → chronic dyspnoea, recurrent pleural effusion.
- Management: Decortication (surgical removal of the fibrous peel via VATS or thoracotomy) to free the lung.
- Splenic delayed rupture: Can occur days to weeks after initial trauma. The initial injury creates a subcapsular haematoma → the capsule eventually ruptures → sudden intra-abdominal haemorrhage. This is why patients with lower left rib fractures need serial monitoring even if initially stable [10].
- Hepatic delayed rupture: Similar mechanism but less common.
- If oesophageal perforation is missed or treatment is delayed → progressive contamination of the mediastinum with saliva, gastric contents, and bacteria → fulminant mediastinitis → septic shock → multi-organ failure.
- Mortality approaches 100% if untreated for > 24 hours [7].
- Clinical features: Septic shock, chest pain, subcutaneous emphysema, Hamman's sign [7].
- If ATAI is initially contained but missed or incompletely treated → the weakened aortic wall gradually dilates → pseudoaneurysm (false aneurysm — contained by adventitia only, not all three vessel wall layers).
- Develops in 2-5% of patients who survive the initial ATAI [3].
- Risk: Rupture at any time (potentially fatal). Requires surveillance and elective repair (TEVAR or open).
- Rarely, extensive chest wall bleeding (e.g., from multiple rib fractures with associated intercostal vessel injury) can cause increased pressure within the chest wall musculature → ischaemia.
- More relevant in circumferential burns of the chest → eschar acts as a constricting band → cannot expand → restrictive physiology → respiratory failure. Management: escharotomy [8].
3. Late Complications (Weeks to Months)
- Why? Rib fractures heal but the intercostal nerves may be damaged or entrapped in callus → chronic neuropathic pain.
- Especially common after thoracotomy — the surgical approach involves rib spreading, which stretches/crushes the intercostal nerves.
- Management: Neuropathic pain agents (gabapentin, pregabalin), nerve blocks, physiotherapy. Prevention: VATS approaches where possible (less nerve damage than open thoracotomy).
- Risk of recurrence: 10-30% at 1-5 years (first PSP), 50% at 3 years (SSP) [5].
- Why? The underlying predisposition (subpleural blebs, emphysematous bullae) persists. The healed pleural breach may re-open.
- Indications for definitive surgery (pleurodesis) [4][5]:
- SSP (all cases)
- PSP: recurrent (2nd ipsilateral, 1st contralateral), synchronous bilateral PTX, persistent air leak, high-risk professions (pilots, divers, drivers), pregnancy
- Modalities: Surgical pleurodesis (VATS with bleb resection + mechanical abrasion ± pleurectomy — recurrence ~1-5%) [4][5]. Chemical pleurodesis (talc, minocycline, autologous blood) if surgically unfit [4].
- Why? Ribs are subject to constant movement with breathing → difficult to immobilise → some fractures heal with malposition (malunion) or fail to heal (non-union).
- Consequence: Chronic pain, chest wall deformity, rarely restrictive lung physiology.
- Management: Usually conservative. Surgical fixation only if symptomatic and refractory.
- Why? Traumatic haemopericardium → inflammation → organisation of blood into fibrous tissue → pericardial fibrosis and calcification → the pericardium becomes a rigid, non-compliant shell → restricts diastolic filling → diastolic heart failure.
- Timeline: Months to years after the initial injury.
- Clinical features: Signs of right heart failure (JVD, hepatomegaly, ascites, peripheral oedema) with Kussmaul's sign (JVP rises on inspiration) and pericardial knock (early diastolic sound).
- Management: Pericardiectomy (surgical stripping of the fibrosed pericardium).
- Missed or untreated ATAI → chronic pseudoaneurysm → risk of delayed rupture. Post-traumatic pseudoaneurysm develops in 2-5% of ATAI survivors [3].
- Requires lifelong surveillance and elective TEVAR/open repair.
- Initially missed diaphragmatic ruptures may present weeks to years later with progressive herniation of abdominal viscera [3].
- Risk: Strangulating intestinal obstruction (a surgical emergency) [3].
- Presentation: Insidious dyspnoea, bowel obstruction symptoms, bowel sounds heard in the chest.
- Management: Surgical repair (thoracic approach usually preferred for delayed presentations due to adhesions).
- Complication of oesophageal perforation repair or mediastinitis → healing by fibrosis → stricture (progressive dysphagia).
- Tracheo-oesophageal fistula may develop if the oesophageal perforation erodes into the adjacent trachea/bronchus → recurrent aspiration, pneumonia, cough with eating [27].
- Management: Endoscopic dilatation for strictures. Surgical repair for fistulae.
- Often overlooked but extremely common — up to 20-40% of major trauma survivors develop PTSD.
- Features: Re-experiencing (flashbacks, nightmares), avoidance (of reminders of trauma), hyperarousal (insomnia, exaggerated startle, irritability), emotional numbing.
- Management: Psychological support, trauma-focused CBT, EMDR (Eye Movement Desensitisation and Reprocessing). Consider SSRI if pharmacotherapy needed.
| Timing | Respiratory | Cardiovascular | Infectious | Other |
|---|---|---|---|---|
| Early (min-days) | ARDS, atelectasis, RPO, persistent air leak | Haemorrhagic shock, arrhythmias, tamponade (recurrent), fat embolism | — | Lethal triad |
| Delayed (days-weeks) | Pneumonia (HAP/VAP), empyema, fibrothorax/trapped lung | DVT/PE, Dressler syndrome | Mediastinitis, wound infection | Delayed organ rupture (spleen), compartment syndrome |
| Late (weeks-months) | Recurrent PTX, restrictive lung (decortication needed) | Constrictive pericarditis, chronic pseudoaneurysm | Oesophageal stricture/fistula | Chronic pain/neuralgia, PTSD, malunion, delayed diaphragmatic hernia |
This is worth highlighting separately because chest drain complications are frequently examined [4][5]:
| Complication | Mechanism | Prevention/Management |
|---|---|---|
| Failed procedure | Incorrect site, inadequate technique | Use landmark anatomy (safety triangle), confirm with LA needle aspiration before drain insertion |
| Pneumothorax (iatrogenic) | Lung punctured during insertion | Blunt dissection technique, avoid trocar |
| Haemothorax / VAN damage | Inserting too close to inferior rib border | Always insert just ABOVE the rib |
| Organ perforation | Liver, spleen, stomach perforated (especially if diaphragm elevated) | Confirm pleural space with LA aspiration. Be cautious with lower insertion sites |
| Re-expansion pulmonary oedema | Rapid re-expansion of collapsed lung | Drain ≤ 1-1.5L at once, ≤ 500 mL/8h [5] |
| Blockage | Blood clot or fibrin | Flush with sterile NS; replace if blocked |
| Dislodgement | Inadequate fixation | Secure suturing; anchor stitch |
| Subcutaneous emphysema | Air tracks along drain tract | Usually self-limiting. If severe → large-bore drain re-insertion. Management: look for and treat underlying cause (e.g., tube obstruction), high concentration O₂, infraclavicular incisions [4] |
| Empyema | Bacterial contamination | Strict aseptic technique; prophylactic antibiotics if high-risk |
| Bronchopleural fistula / PAL | Persistent air leak from visceral pleura | Continued drainage + low wall suction. If persists > 5-7 days → surgical consultation [4][5] |
High Yield Summary
Key Complications to Remember:
-
ARDS: Most important respiratory complication. Pulmonary contusion → DAD → refractory hypoxaemia. Manage with low tidal volume ventilation + high PEEP. Berlin criteria define severity.
-
Pneumonia: Pain → splinting → atelectasis → sputum retention → infection. Prevention is key: analgesia (epidural), chest physiotherapy, early mobilisation.
-
Persistent air leak / bronchopleural fistula: Air leak ≥ 5 days. NEVER clamp the drain. Manage with continued drainage, endobronchial valve, or pleurodesis.
-
Re-expansion pulmonary oedema: From rapid lung re-expansion. Limit drainage to ≤ 1.5L at once. Improves upon clamping the drain.
-
Fat embolism syndrome: 24-72h post-long-bone fracture. Classic triad: respiratory distress + petechiae + confusion. Supportive management.
-
DVT/PE: Virchow's triad fully activated in trauma. Leading preventable cause of death. Mechanical + pharmacological prophylaxis.
-
Empyema from retained haemothorax: Early complete drainage prevents this. VATS for clotted haemothorax.
-
Fibrothorax/trapped lung: Organised haemothorax → fibrous peel → lung cannot expand. Requires decortication.
-
Delayed diaphragmatic hernia: Initially missed rupture → progressive herniation → risk of strangulation [3].
-
Dressler syndrome: Autoimmune pericarditis weeks/months post-cardiac injury. Fever + pleuritic pain + effusion + ↑inflammatory markers.
-
Chest drain complications: Malposition, haemothorax (VAN damage), organ perforation, blockage, subcutaneous emphysema, RPO, empyema.
-
PTSD: Up to 20-40% of major trauma survivors. Do not overlook psychological care.
Active Recall - Chest Injury Complications
References
[1] Lecture slides: GC 182. Chopped and stabbed wound in gang fight Nerves and vascular injury; Classification of injuries.pdf [3] Senior notes: Ryan Ho Radiology.pdf (Chapter 1: Radiology in Trauma) [4] Senior notes: Maksim Medicine Notes.pdf (p291-296, Pneumothorax, Chest Drain, Complications) [5] Senior notes: Ryan Ho Respiratory.pdf (p153-155, Pneumothorax Management and Chest Drain) [7] Senior notes: Maksim Surgery Notes.pdf (p58-59, Esophageal perforation / Boerhaave's) [8] Lecture slides: GC 190. I have a scald Burn.pdf [9] Senior notes: Ryan Ho Respiratory.pdf (p37, ARDS) [10] Senior notes: Maksim Surgery Notes.pdf (p42, Trauma) [12] Senior notes: Ryan Ho Cardiology.pdf (p140-141, Pericardial Complications and Dressler Syndrome) [24] Senior notes: Maksim Surgery Notes.pdf (p213-215, Trauma Complications) [25] Senior notes: Maksim Medicine Notes.pdf (p286-287, ARDS) [26] Senior notes: Maksim Surgery Notes.pdf (p28, Post-operative Complications) [27] Senior notes: Ryan Ho GI.pdf (p73, Oesophagectomy Complications)
Ca Lung
Lung cancer is a malignant neoplasm arising from the epithelial cells of the bronchial tree or lung parenchyma, most commonly classified as non-small cell or small cell carcinoma.
Pleural Effusion
Pleural effusion is the abnormal accumulation of fluid in the pleural space between the visceral and parietal pleurae, resulting from imbalances in hydrostatic, oncotic, or lymphatic pressures or from increased capillary permeability.