GC175 A Bus Hit A Train Multiple Trauma; Disaster Management
A mass casualty incident involving a bus-train collision requiring activation of disaster management protocols to triage, prioritize, and treat multiple trauma victims with coordinated prehospital and hospital resource allocation.
Disaster Management & Multiple Trauma
This lecture (GC 175) is delivered by Dr Dai Wing Chiu, Director of Trauma Service & Consultant Surgeon at Queen Mary Hospital. It covers two intertwined domains: disaster management (pre-hospital, system-level response to mass casualty incidents) and multiple trauma (clinical approach to the severely injured individual). Its opening photographs contrast a fatal Egyptian school-bus/train crash with a 62-injury Hong Kong rail collision, then later use the Boston Marathon bombing (2013) and Beirut explosion (2020) to show how the same hazard produces different outcomes when capacity, access and infrastructure differ.
Why this matters for exams: Disaster management and triage appear as MCQs testing the correct first action, the difference between field and hospital triage, and the ABCDE approach. Past papers have directly tested on-site triage methods, incident command, crush syndrome in disasters, and the widened mediastinum in trauma. The lecture also bridges to GC 207 (TEAM), GC 208 (Head Injury), GC 188 (Abdominal Injury), and GC 231 (High Energy Trauma), so understanding this framework is foundational.
Learning Objectives (from the lecture) [1]:
- What is a disaster
- The classification of disasters
- Principles of mass casualty management
- Principles of resuscitation of mass casualties
The four headings are the lecturer's conceptual phases, not a rigid one-way sequence: evacuation, stabilisation and definitive-care preparation often overlap, while triage and reassessment continue throughout.
1. What Is a Disaster?
"A sudden event, such as an accident or a natural catastrophe, that causes great damage or loss of life. An event or fact that has unfortunate consequences." [1]
Key Distinction: Disaster vs MCI
A disaster is the event itself. A Mass Casualty Incident (MCI) is defined by the functional mismatch between needs and resources: "Event(s) causing a number of casualties large enough to disrupt the health care services of the affected community." The defining formula is Needs >>> Resources. [1]
This means the same event (e.g., a bus crash with 20 casualties) might be an MCI in a rural area but not in a major urban centre with multiple trauma centres. Context determines whether it's an MCI.
The disaster environment is:
- Complicated
- Stressful
- Situational uncertainty
- Time compression
- High demand of qualified cares
Understanding this is important because it explains why we need pre-planned protocols, incident command systems, and simplified triage algorithms — you cannot rely on ad-hoc decision-making under these conditions.
Disasters arise from the intersection of vulnerability and hazard:
| Vulnerability Factors | Hazard Examples |
|---|---|
| Livelihood and its resilience | Flood |
| Baseline status of well-being | Cyclone |
| Self-protection | Earthquake |
| Social protection | Tsunami |
| Governance | Volcanic eruption, Drought, Landslide, Biological |
When a community's vulnerability is high and a hazard strikes, the result is a disaster. This model explains why the same magnitude event produces vastly different outcomes in different settings.
| Category | Examples | Lecture-Specific Data [1] |
|---|---|---|
| Natural disasters | Typhoons, earthquakes, floods, landslides, forest/hill fire | 1976 Tangshan: 240,000–700,000 deaths; 2004 Tsunami: 230,000; 2008 Sichuan: 69,000; 2010 Haiti: 316,000 |
| Man-made disasters | War, Transportation, Industrial accidents, Terrorism, Technological disasters | Hong Kong 2013 bus-train: 62 injured; Boston Marathon 2013; Beirut 2020 |
| Disease outbreaks | Epidemics/pandemics (WHO list) | Referenced via WHO emergency diseases page |
The death totals and conflict table in slides 10–11 are historical snapshots with source-dependent estimates, not a current ranking. The coronavirus image on slide 12 is generic illustrative artwork and cannot identify a particular virus.
Classification of Disasters: Natural disasters — Typhoons, earthquakes, floods, landslides, forest/hill fire. Man-made disasters — War, Transportation, Industrial accidents, Terrorism, Technological disasters. Disease. [1]
Why classify? Because the type of disaster predicts the pattern of injuries (e.g., blast injuries in terrorism, crush injuries in earthquakes, burns in industrial accidents), the contamination risk (chemical/radiological in industrial/terrorism), and the scale/duration of the response needed.
This is a crucial conceptual shift that examiners love to test:
| Parameter | Civilian Urban | Civilian Rural | Disaster |
|---|---|---|---|
| Threat level | None | None | High |
| Resources | Readily available | May be limited | Severely limited |
| Personnel | Excess | Limited but expandable | Fixed and limited |
| Supplies/Equipment | Fully equipped, resupply readily available | Adequately equipped, delay to resupply | Limited supplies, resupply significantly delayed |
| Available expertise | Full subspecialty services | Limited specialties locally available | No subspecialty services immediately available |
| Transfer availability | Immediately available | Available but longer transport times | Highly variable, maybe no option for transfer |
The paradigm change: from the application of unlimited resources for the greatest good of each individual patient, to the allocation of limited resources for the greatest good of the greatest number of casualties. [1]
Exam Trap
Routine acuity triage and MCI triage answer different questions. During an MCI, prioritisation incorporates urgency, likely benefit, resource requirement and current capacity—not injury severity alone. Categories can change as resources or physiology change, and people in expectant/palliative pathways still require comfort, dignity and reassessment [14][15].
4. ABCs of MCI Response — Four Phases
ABCs of MCI Response — Four Phases: 1. Search and rescue; 2. Triage and initial stabilisation; 3. Definitive medical care; 4. Evacuation. [1]
- Getting to the victims and extricating them from the scene
- Safety of rescuers is the first priority (scene safety — fire, structural collapse, chemical hazard, secondary devices in terrorism)
Phase 2: Triage and Initial Stabilisation
| Peak | Timing | Causes | Intervention |
|---|---|---|---|
| Immediate deaths | Seconds to minutes | Massive brain injury, high spinal cord injury, cardiac/great vessel rupture | Generally not salvageable even with perfect care |
| Early deaths | Minutes to hours | Airway obstruction, tension pneumothorax, haemorrhage (splenic/liver laceration, pelvic fracture), epidural haematoma | Rapid recognition, haemorrhage control, resuscitation and appropriate transfer |
| Late deaths | Days to weeks | Sepsis, multi-organ failure, secondary brain injury | ICU care, damage control surgery, infection prevention |
The trimodal death distribution shows immediate deaths (seconds-minutes), early deaths (minutes-hours), and late deaths (days-weeks). [1]
This is the classic historical teaching model, not a literal modern mortality curve. Contemporary registry studies generally do not reproduce three discrete peaks; many show a dominant early peak followed by decline. Likewise, the “golden hour” is a reminder that time-critical injury needs prompt care, not proof that every patient has a universal 60-minute deadline [13].
The bars and coloured curves are schematic. Their y-axis numbers come from the source teaching figure and should not be interpreted as current incidence or used to predict an individual patient's outcome.
- A — Airway
- B — Breathing
- C — Circulation
Safety is the first concern. To provide maximum outcome benefit for the majority. To identify, provide initial treatment, and transfer victims with life and limb threatening conditions to the appropriate hospital. [1]
| Triage Type | Principle | Priority | Context |
|---|---|---|---|
| Mass-casualty field triage | Maximise benefit under actual resource constraints | Rapidly sort, apply only designated immediate life-saving interventions, reassess and route/transport | Scene-specific protocol (for example SALT/START or local equivalent) |
| Routine emergency-unit triage | Acuity and time-to-treatment | Highest-acuity patients require immediate assessment/resuscitation | Normal operating conditions |
| Facility MCI triage | Match urgency and likely benefit to temporarily inadequate capacity | Separate red, yellow, green and locally defined expectant/palliative pathways | Activated hospital MCI plan |
| Military triage | Depends on mission, threat, evacuation chain and resources | It is not simply “treat mildly injured first” in every military setting | Operational doctrine |
High Yield — Field Triage vs AED Triage
The lecture's exam contrast is “greatest good for the greatest number” versus routine acuity triage. In practice, field teams do more than sort: the adopted algorithm may permit rapid life-saving interventions such as catastrophic haemorrhage control or airway positioning before treatment/transport. Use the declared local system and repeat triage whenever physiology, resources or destination capacity changes [14][15].
Victims designated as "acute" or "non-acute." Acute = Red. Non-acute = Green. [1]
This is the lecture's first global sort. People able to walk are directed to a green collection area; this is provisional, not a final “minor injury” diagnosis. Non-walking patients are not all automatically final-red: they need the next algorithmic assessment, and walking patients need reassessment because occult serious injury is possible.
The ability to walk is the fastest discriminator at the scene. This is directly tested — see past paper Q3 (2022 MCQ) below.
Rapid categorisation of victims at casualty site by experienced medical personnel with a knowledge of various injuries (e.g., blast, crush, biological, radiological, chemical, burns). [1]
The photograph shows the Hong Kong Cruciform Triage Tag, with a central clinical record and four fold-out colour arms:
- Red (Immediate/T1): Life-threatening injuries, salvageable with immediate treatment
- Yellow (second priority/T2): Serious but able to wait under the active plan
- Green (walking wounded/T3): Lower acuity after assessment
- Black: Dead on this specific tag
Do not universalise the exact colours or combine “dead” and “expectant” without checking the local protocol. Current WHO facility MCI materials use red/yellow/green clinical zones and can add a separate blue palliative-care pathway; SALT has its own minimal/delayed/immediate/expectant/dead categories [14][15].
Easy visible for disaster victims. Big sign post. Convenient exit routes for air and land evacuation. [1]
This is where victims are gathered after initial triage, before evacuation. Practical point: if the collection site is hard to find or has poor access routes, the entire evacuation chain breaks down.
This is where ATLS principles apply — see Section 5 below.
ATLS Initial Assessment Sequence [1]
This sequence reinforces that preparation (team assembly, equipment check) precedes patient contact, and that reevaluation occurs after both the primary and secondary surveys to catch deterioration or missed injuries.
Modes of evacuation:
- Ground transport
- Helicopters
- Small fixed-wing aircraft
- Large fixed-wing aircraft
Indications for Evacuation [1]:
- Decompress disaster area (reduce the burden on overwhelmed local facilities)
- Improve care for critical casualties
- Provide specialised care to specific casualties (burns, crush injuries)
Concepts of ATLS — Advanced Trauma Life Support: Treat the greatest threat to life first. Definitive diagnosis should not impede the application of an indicated treatment. A detailed history is not essential to begin the evaluation. "ABCDE" approach. [1]
High Yield
“Treat the greatest threat to life first” and “a detailed history is not essential to begin evaluation” are the key axioms. The primary survey begins immediately, but catastrophic external haemorrhage may require control before or alongside airway work (often written cABCDE). The correct first action is therefore the most immediate reversible threat—not an inflexible slogan.
Primary Survey — ABCDE [1]
Primary Survey: Patients are assessed and treatment priorities established based on their injuries, vital signs, and injury mechanisms.
| Step | Component | Key Actions |
|---|---|---|
| A | Airway with cervical-spine motion restriction when indicated | Speak to the patient, clear/suction the airway, use simple adjuncts and intubate if the airway cannot be protected or ventilation is failing. Minimise cervical movement according to mechanism/examination; avoid indiscriminate prolonged immobilisation. |
| B | Breathing and ventilation | Inspect, palpate and auscultate while monitoring oxygenation/ventilation. Treat clinical tension pneumothorax immediately using the locally trained decompression technique, then provide definitive pleural drainage; do not wait for imaging. |
| C | Circulation with haemorrhage control | Control external bleeding with direct pressure, packing or tourniquet as appropriate; obtain rapid IV/IO access and activate major-haemorrhage pathways early. Limit unnecessary crystalloid, use warmed balanced resuscitation/blood components as indicated, prevent hypothermia, and give tranexamic acid as early as possible within 3 hours when significant bleeding is present. Search chest, abdomen/retroperitoneum, pelvis, long bones and external sites; place a binder over the greater trochanters when unstable pelvic-ring injury is suspected [16]. |
| D | Disability / Neurologic status | AVPU or GCS, pupil size and reactivity, lateralising signs. Glucose check (hypoglycaemia mimics head injury). |
| E | Exposure / Environmental control | Fully undress the patient (log roll to examine back), but prevent hypothermia with warm blankets and warm IV fluids. The trauma triad of death = hypothermia + acidosis + coagulopathy. |
Sequence is prioritised but simultaneous: teams assess and treat cABCDE threats in parallel and repeatedly reassess after every intervention. Do not delay control of exsanguinating external haemorrhage while waiting for an unrelated airway task to finish.
After primary survey: Adjuncts include Foley catheter (unless urethral injury suspected), NG tube (orogastric if base of skull fracture suspected), ECG monitoring, and trauma imaging (CXR, pelvic XR, FAST) [2].
6. Primary Trauma Diversion
This section reproduces the lecture-era Hong Kong diversion slide. The slide itself places a large cross over its old anatomical/physiological list and notes that criteria had changed. It must therefore be learned as historical context, not used as a current dispatch protocol. Current destination decisions follow the live Fire Services/HA trauma-network protocol, receiving capacity and medical control.
| Criterion | Why It Matters |
|---|---|
| Flail chest | Indicates severe thoracic trauma with likely underlying pulmonary contusion; ventilatory failure |
| Lower limb fracture involving two long bones | Massive blood loss potential (each femur fracture ~1–1.5L) |
| Amputation proximal to wrist or ankle | Major vascular injury, haemorrhage |
| All penetrating injuries to head, neck or torso | Risk of injury to vital structures (great vessels, heart, CNS, abdominal viscera) |
| Limb paralysis | Spinal cord injury |
| Pelvic fracture | Massive haemorrhage potential (retroperitoneal, up to several litres) |
| Combined trauma and burns ( > 2nd degree or > 20%) | Complex management, need burn unit |
| Criterion | Threshold | Significance |
|---|---|---|
| GCS | < 14 | Any reduction in consciousness suggests significant head injury |
| Systolic BP | < 90 mmHg | Haemorrhagic shock (Class III/IV) |
| Respiratory rate | < 10 or > 29/min | Impending respiratory failure or severe distress |
| Cardiac arrest or airway difficulties | Present | Slide-era local criterion |
Primary Trauma Diversion criteria determine whether a patient should be transported directly to a trauma centre rather than the nearest hospital. [1]
Exam Intelligence
Do not mix individual trauma destination triage with MCI triage. The 2021 ACS field-triage guideline uses updated high-risk (red) and moderate-risk (yellow) criteria for routine injured-patient destination decisions, and explicitly expects local adaptation. The older CDC scheme likewise states that it is not an MCI triage tool [17].
7. Hong Kong-Specific Disaster Plans
Historical Local Plan — Verify Before Operational Use
Slides 32–34 show a particular lecture-era airport routing table, burn distribution sequence and QMH activation trigger. Hospitals, capabilities, command structures and thresholds change. Preserve these for examination/source fidelity only; in real care use the current Hospital Authority, Fire Services and institutional major-incident plan.
CLK Airport has its own standalone contingency plan with a different preset diversion: Ambulance → PMH, YCH, CMC. Helicopter → PYNEH. Boat → TMH. MTR ± ambulance (green cases) → QEH, KWH. [1]
- Burn Units: PWH, QMH
- Burn Facilities: KWH, QEH, TMH
- Patients are distributed in a rotating sequence between PWH and QMH for the first patients, then to burn facilities, then repeating the cycle [1]
QMH Major Incident Response Plan / Disaster Plan activation considered when: QMH is informed of an accident on Hong Kong Island involving ≥ 8 victims, OR RH/PYNEH declares full disaster activation. [1]
The fixed “≥8 victims” number is not a universal definition of MCI and should not delay escalation. Contemporary WHO planning uses mismatch between surge and available capacity, with tiered activation, incident command, red/green zones, patient tracking and primary/backup communications [14].
Successful disaster response requires well-defined leadership role. Those in charge require: clinical expertise to treat the injured, an understanding of hospital triage principles, experience in caring for patients when resources are scarce. [1]
Incident Command System (ICS): Needs to start early before an incident gets out of control. Medical responder must adhere to the structure of ICS. A unified command is important. The structure of the ICS must be the same. The key personnel may be different. [1]
Why ICS matters: Without a command structure, chaos ensues — resources get wasted, patients fall through cracks, communication breaks down. The ICS is a standardised management hierarchy that can scale up or down. In Hong Kong, you report to the Medical Controlling Officer (MCO) at the scene — this is directly tested (see 2023 MCQ Q3 below).
Incident Command Structure [1]
The Incident Commander sits at the apex. Three Staff Officers (Liaison, PIO, Safety) report directly to the IC. Four Sections (Operations, Planning, Logistics, Finance/Admin) execute the response plan. The Safety Officer's skill set should match the disaster type — e.g., radiation detection expertise for nuclear incidents vs. biological infection control for outbreaks [1].
Multidisciplinary Team [1]
Trauma management involves: Surgeons, AED doctors, Orthopaedic Surgeons, Neurosurgeons, Anaesthetists, Intensivists, Nurses, Other paramedics. [1]
9. Case Studies
A 23-year-old motorcyclist with:
- Pelvic fracture
- Open fracture femur
- Bilateral haemopneumothorax
- Proximal descending aortic rupture
- Left zygomatic arch fracture
- Transfused 40 units of packed cells
- Intra-operative CPR twice
How to read the case image: the crowded resuscitation bay and injury list show why trauma care needs named leadership and simultaneous airway, thoracic, haemorrhage, vascular, orthopaedic and transfusion workstreams. “40 units” and two intra-operative arrests describe this survivor; they are not resuscitation targets. Modern damage-control resuscitation means early haemorrhage control, balanced haemostatic resuscitation, warming and correction of coagulopathy. Any lower-pressure strategy is individualised and is inappropriate when cerebral perfusion must be protected in severe traumatic brain injury [16].
Facts:
- 26,893 runners, > 500,000 spectators
- 3 killed at scene
- No patients who arrived at a hospital died
- 66% had lower extremity soft tissue and bony injuries
- MGH: 907 beds, 61 ORs
- 14:50 — 2 IEDs detonated; 15:03 — Disaster declaration; 15:04 — First patient arrived; 15:24 — First severely injured patient in OR
- 32 patients at MGH, 7 emergent surgical patients, all underwent amputation
Logistical patient flow [1]:
- 281 patients injured in bombing total
- 127 patients evaluated at Level I trauma centres on April 15; 154 treated at other hospitals or presented later
- Of the 127: 75 admitted, 52 discharged from ED
- 54 patients underwent operative intervention on April 15
- 47 patients underwent repeat operative intervention (staged/damage control approach)
Reading slides 44–46: the left flow chart narrows 281 injured people to 127 assessed at Level I centres, 75 admissions, 54 same-day operations and 47 repeat operations. The adjacent bars show that total load was distributed across six hospitals, while the smaller high-ISS subset clustered unevenly. The arrival/OR plot shows an early surge in lower-severity arrivals and a slower cumulative rise in operations. These descriptive charts support distribution, surge capacity and staged surgery; they do not prove that any single feature caused survival.
Factors associated with the reported zero in-hospital mortality [1]:
- Adequate preparation — years of MCI drills
- Rapid logistical response
- Short transport time — median 11 minutes from explosion to hospital
- Immediate access to operating rooms
- Multidisciplinary care delivery
- Luck
Pre-hospital factors [1]:
- Community had planned and drilled for MCI for many years
- Medical tent at finish line converted to emergency triage unit
- "Scoop and run" policy — get patients to trauma centres fast, don't spend time on scene
- Field tourniquets: 31 patients had exsanguinating haemorrhage, 26 had field tourniquets in place
"Luck" factors [1]:
- Open-air bombing (closed-space explosions cause much higher mortality due to reflected blast waves)
- Ground level, lower-grade explosives
- 5 adult Level 1 trauma centres + 4 paediatric trauma centres nearby
- Streets cordoned off for runners → easy evacuation routes
- Patriots' Day holiday → light OR schedules
- Hospital ICS and surgical teams already in place
- Bombing at shift change → double staffing
Challenges [1]:
- Cellular calls became saturated immediately after the bombings; the city did not shut down all towers. Texting, Wireless Priority Service, radios and some satellite phones remained available, illustrating why redundant communications are essential [18]
- Patient identification problems
- Surgeons unfamiliar with some procedures (e.g., traumatic amputation management)
In-hospital data [1]:
- Median ED length of stay: 106 minutes (range 10–481)
- 45 (60%) admitted directly to ORs
- 9.5% required emergent airway control
- 11.8% required immediate PRBC transfusion in ED
- 25% required CT scan in ED
- Damage control surgery: arrest bleeding, completion of amputations, external fixators, soft tissue debridement, foreign body removal
- 12 patients underwent above/below knee amputation
These figures describe the lecture's Beirut case study, not a live incident dashboard; published estimates vary by date and source.
Scale:
-
6,500 injuries
- 220 deaths
-
150,000 homeless
- 1/3 of Beirut with structural damage
-
$15 billion USD in damage
Healthcare system impact [1]:
- 3 major hospitals completely non-functional → immediate patient evacuation needed
- 3 other major hospitals substantially damaged
- 600 hospital beds instantaneously lost
American University of Beirut experience [1]:
-
350-bed academic hospital, < 2 miles from blast
-
One of the 4 major academic teaching hospitals of Lebanon
-
Partial structural damage, many staff injured, 4 staff died
-
Influx of injured patients within 10 minutes
-
First 24 hours: 500 patients treated, 68 emergent surgical procedures (17 within first 4 hours)
-
First 4 hours: 8 craniotomies, 3 amputations, 2 laparotomies, 2 ophthalmologic, 1 ENT, 1 sternotomy
-
Next 4–12 hours: 1 neurosurgery, 2 ophthalmology, 12 orthopaedics, 8 plastic surgery, 2 ENT, 1 vascular
Challenges [1]:
- Capacity and resources immediately overwhelmed
- Staff among injured
- Friends and relatives among injured
- Everyone in state of shock and fear
- Very few wearing masks during COVID pandemic
- Most patients without identification
- Morgue filled quickly
- The slide states that every medical student and resident was mobilised. The systems lesson is preassigned, supervised surge roles within competence—not unsupervised substitution for trained staff.
"The key to succeeding in responding to a catastrophic event is to anticipate the event, plan the response and practise the plan." [1]
"Paradigm change from the application of unlimited resources for the greatest good of each individual patient, to the allocation of limited resources for the greatest good of the greatest number of casualties." [1]
The American College of Surgeons Committee on Trauma statement further emphasises that effective disaster management is achieved through planning and training via both internal hospital drills and regional exercises involving all community resources. The key disaster-management activities are: Rescue → Decontamination → Triage → Stabilisation → Evacuation → Definitive Treatment [1].
"Physician must possess sufficient familiarity with the incident command system and the community resources." [1]
The 4 Phases of the Disaster-Management Cycle [1]
This circular graphic is different from the lecture's earlier four operational MCI steps. Here the cycle is mitigation/prevention → preparation → response → recovery, returning to mitigation as lessons are incorporated. It emphasises that readiness is continuous rather than beginning when casualties arrive [1][14].
11. Integration with Related Lectures
The primary survey ABCDE framework from this lecture is expanded in GC 207. Key additions:
- Adjuncts to primary survey: ECG monitoring, urinary catheter, gastric tube, trauma imaging
- Secondary survey: Head-to-toe examination only after primary survey is complete and resuscitation is underway
- Tertiary survey: 24-hour re-evaluation to catch missed injuries
- GCS classification: Mild (13–15), Moderate (9–12), Severe (3–8)
- Primary vs secondary brain injury distinction
- Indications for CT brain (GCS < 15 at 2 hours, any LOC with risk factors, focal neurological deficit, suspected open/depressed skull fracture)
- FAST scan protocol: Morison's pouch, splenorenal space, pelvis (Pouch of Douglas), subxiphoid (pericardium) [2]
- Unstable + FAST positive → laparotomy; Stable → CT
- The slide's “combined trauma and burns (> 2nd degree or > 20%)” is an old local diversion rule, not a universal current threshold.
- Burn fluids are titrated to physiology and urine output under the current burn protocol; do not prescribe one memorised formula without age, burn depth/TBSA, inhalation injury, associated trauma and time-from-burn context.
- Apply cervical-spine motion restriction when indicated by mechanism and assessment, then clear promptly using the local validated pathway; “always immobilise everyone until cleared” is an overstatement
- ASIA classification for spinal cord injury grading
- Neurogenic shock (bradycardia + hypotension) must be distinguished from hypovolaemic shock (tachycardia + hypotension)
- The aortic isthmus is the common classic site after blunt deceleration injury.
- Widened mediastinum on trauma CXR is a screening clue, not a hallmark and not sufficiently sensitive or specific to rule injury in or out.
- In a stable patient with concerning mechanism/findings, CT angiography is the usual definitive imaging test.
12. Exam Intelligence
| Theme | What They Test | Typical Correct Answer |
|---|---|---|
| On-site triage first step | How to rapidly sort acute vs non-acute | Ask victims to walk (walking = Green/non-acute) |
| MCI vs routine triage | Philosophy difference | MCI = maximise benefit under constrained capacity; routine triage = urgency/time-to-treatment |
| ICS reporting structure | Who to report to at scene | Medical Controlling Officer (MCO) |
| Primary survey order | What comes first | Control catastrophic external bleeding if present, then airway with indicated cervical motion restriction; address threats in parallel |
| Widened mediastinum in trauma | Most important diagnosis | Acute traumatic aortic injury |
| Primary trauma diversion | Lecture-era physiological threshold | GCS < 14 in the old slide; current live destination protocol governs |
| Disaster definition vs MCI | What defines an MCI | Needs >>> Resources |
| Crush syndrome in disaster | Cardiac arrest after extrication | Hyperkalaemia → give calcium gluconate + insulin/dextrose |
- Assuming MCI triage means “sickest first” or “do nothing but sort” — Use the declared algorithm: global sort, permitted life-saving interventions, prioritisation by likely benefit/resource need, tracking and repeated reassessment.
- "Take detailed history before examination" — ATLS says no, start ABCDE immediately.
- Confusing neurogenic shock with haemorrhagic shock — Neurogenic = bradycardia + hypotension + warm peripheries. Haemorrhagic = tachycardia + hypotension + cold peripheries.
- FAST negative = no abdominal injury — False. FAST can miss parenchymal injuries without free fluid. CT is gold standard [3].
- Supine CXR for pneumothorax — Look for deep sulcus sign, not the classic apical lucency (that's on erect CXR) [3].
- "Walk me through the management of an MCI at the scene" — Describe the 4 phases, emphasise safety first, Level 1 triage (walk test), Level 2 medical triage (cruciform tag), evacuation
- "What is the difference between MCI and routine triage?" — MCI triage adapts prioritisation to temporarily inadequate resources; routine emergency triage prioritises acuity/time-to-treatment
- "A patient arrives from an MCI — describe your primary survey" — ABCDE with specifics for each step
- "What are the primary trauma diversion criteria?" — List anatomical and physiological criteria
- "What lessons can we learn from the Boston Marathon bombing response?" — Preparation, drilling, short transport times, OR access, multidisciplinary care, damage control surgery, field tourniquets
- "What is crush syndrome and how do you manage it?" — Link to earthquake/disaster context, rhabdomyolysis, reperfusion hyperkalaemia, monitored early isotonic fluid when feasible, electrolyte/renal surveillance and early dialysis-capable support
High Yield Summary
-
Disaster/MCI
- Needs >>> Resources. Paradigm shifts from individual best care to greatest good for greatest number.
-
Classification
- Natural (earthquake, flood, typhoon) vs Man-made (war, transport, terrorism, industrial) vs Disease.
-
Four Phases of MCI Response
- Search & Rescue → Triage & Stabilisation → Definitive Care → Evacuation.
-
On-Site Triage (Level 1)
- Direct people able to walk to a provisional green collection area; assess non-walking casualties with the declared algorithm, then tag, track and reassess every group.
-
MCI triage is dynamic
- Globally sort, apply protocol-approved immediate life-saving interventions, tag/track, route by capacity and repeat triage as physiology and resources change.
-
Trauma cABCDE
- Control catastrophic external haemorrhage, then airway with indicated cervical motion restriction, breathing, circulation, disability and exposure. Team actions occur in parallel with repeated reassessment.
-
Primary Trauma Diversion (HK)
- The crossed-out slide list and the airport/burn/QMH tables are historical. Use them for source recognition only; operational destination and activation decisions require the current local protocol.
-
Trimodal-death graphic
- A historical schematic that highlights time-critical threats; modern trauma deaths do not consistently form three discrete peaks, and the “golden hour” is not a universal stopwatch.
-
ICS
- Start early, unified command, report to Medical Controlling Officer at scene.
-
Boston lessons
- Preparation/drilling, redundant command and communications, rapid distribution, haemorrhage control, OR access and multidisciplinary staged care were associated with the reported outcome; the descriptive case study does not prove a single causal formula.
- Crush syndrome in disasters
- Establish monitoring/IV access and start individualised isotonic fluid before extrication when feasible; anticipate reperfusion hyperkalaemia, rhabdomyolysis and AKI, and arrange dialysis-capable support early when severe.
Active Recall - Lecture Notes
[1] Lecture slides: GC 175. A bus hit a train Multiple trauma; Disaster management.pdf [2] Senior notes: Maksim Surgery Notes.pdf (Section 2.1 Trauma) [3] Senior notes: Ryan Ho Radiology.pdf (FAST and CT in trauma) [4] AOS material: AOS - Radiology.pdf (Acute Traumatic Aortic Injury) [5] Lecture slides: GC 207. Trauma Evaluation and Management (TEAM).pdf [6] Senior notes: MBBS Final MB (Surgery) (Felix PY Lai).pdf (Head Injury section) [7] Senior notes: Ryan Ho Neurology.pdf (Spinal Trauma section) [13] Gunst M, et al. Changing epidemiology of trauma deaths leads to a bimodal distribution. Proc (Bayl Univ Med Cent). 2010;23:349-354. https://pmc.ncbi.nlm.nih.gov/articles/PMC2943446/ [14] World Health Organization. Mass Casualty Management and operational tools. https://www.who.int/teams/integrated-health-services/clinical-services-and-systems/emergency-and-critical-care/mass-casualty-management [15] US HHS ASPR TRACIE. SALT Mass Casualty Triage Algorithm. https://asprtracie.hhs.gov/technical-resources/resource/4680/salt-mass-casualty-triage-algorithm-sort-assess-lifesaving-interventions-treatment-transport [16] Rossaint R, et al. European guideline on management of major bleeding and coagulopathy following trauma: sixth edition. Critical Care. 2023;27:80. https://pmc.ncbi.nlm.nih.gov/articles/PMC9977110/ [17] American College of Surgeons. National Guidelines for the Field Triage of Injured Patients (2021). https://www.facs.org/quality-programs/trauma/systems/field-triage-guidelines/ [18] Commonwealth of Massachusetts. After Action Report for the Response to the 2013 Boston Marathon Bombings. https://www.mass.gov/doc/after-action-report-for-the-response-to-the-2013-boston-marathon-bombings/download [19] World Health Organization Regional Office for the Eastern Mediterranean. WHO trauma experts explain earthquake mortality and crush injury. https://www.emro.who.int/media/news/for-every-2-injuries-due-to-the-syria-earthquake-a-death-has-occurred-who-trauma-experts-explain-why.html [20] Coccolini F, et al. Pelvic trauma: WSES classification and guidelines. World J Emerg Surg. 2017;12:5. https://pmc.ncbi.nlm.nih.gov/articles/PMC5241998/
GC174 Confidentiality Balancing Public Vs Private Interests
Confidentiality balancing public versus private interests is the ethical and legal framework guiding when a physician may breach patient confidentiality to protect the wider public, such as in cases of notifiable diseases, serious harm risk, or court-ordered disclosure.
GC177 A Thyroid Nodule Benign Thyroid Nodules; Thyroid Cancer
Thyroid nodules are discrete lesions within the thyroid gland, classified as benign (colloid nodules, adenomas) or malignant (papillary, follicular, medullary, or anaplastic carcinoma), evaluated by ultrasound characteristics and fine-needle aspiration cytology.