Obstructive Jaundice

For gallstone-related obstruction (benign):

• Classic "Fat, Female, Fertile, Forty" — risk factors for cholesterol gallstones ^[2]
• Obesity, rapid weight loss, metabolic syndrome, oestrogen (OCP, pregnancy), ileal disease (Crohn's), TPN

For malignant biliary obstruction:

• Bile produced by hepatocytes drains into bile canaliculi → interlobular (portal) bile ductules → progressively larger intrahepatic ducts → right and left hepatic ducts.

1. Right hepatic duct (RHD) + Left hepatic duct (LHD) converge at the hepatic hilum (confluence) → Common hepatic duct (CHD) ^[1][7]
2. Cystic duct (from the gallbladder neck/Hartmann's pouch) joins the CHD → Common bile duct (CBD), typically ~6–8 mm in diameter (≤8 mm is normal; post-cholecystectomy up to 10–11 mm is acceptable)
3. CBD passes behind the first part of the duodenum and through the head of the pancreas
4. CBD joins the main pancreatic duct (duct of Wirsung) → hepatopancreatic ampulla (ampulla of Vater) → opens at the major duodenal papilla into the second part of the duodenum
5. The sphincter of Oddi is a muscular valve surrounding the ampulla, regulating bile and pancreatic juice flow

• Located in the gallbladder fossa on the undersurface of liver segments IV and V
• Composed of fundus, body, infundibulum (Hartmann's pouch), and neck ^[7]
• Functions: concentrates and stores bile between meals; contracts in response to CCK released post-prandially

• Bile is essential for emulsification and absorption of dietary fats and fat-soluble vitamins (A, D, E, K)
• Bile also serves as the excretory route for conjugated bilirubin, cholesterol, drugs, and toxins
• Normal barrier mechanisms of the biliary tree prevent infection: continuous flushing action of bile, bacteriostatic bile salts, biliary mucous IgA, and the sphincter of Oddi as a mechanical anti-reflux barrier ^[7]

When the bile duct is blocked:

1. Conjugated bilirubin cannot enter the gut → it regurgitates back into blood → conjugated hyperbilirubinaemia
2. Conjugated bilirubin is water-soluble → filtered by kidneys → tea-coloured urine ^[2][3]
3. No bilirubin reaches the colon → no bacterial conversion to stercobilinogen/stercobilin → pale/clay-coloured stools ^[1][2]
4. No urobilinogen formed in the gut → urinary urobilinogen is absent (distinguishes complete obstruction from hepatocellular jaundice, where urinary urobilinogen is actually increased) ^[7]
5. Bile salts accumulate in blood → deposit in skin → stimulate sensory nerve endings → generalised pruritus ^[2][3]
6. No bile salts in gut → impaired fat emulsification → fat malabsorption → steatorrhoea (floating, foul-smelling, difficult to flush) and malabsorption of fat-soluble vitamins (A, D, E, K) ^[1]

The differential diagnosis of extrahepatic obstruction is organised as intraluminal, mural, and extramural ^[2][3]:

Intrahepatic causes of cholestasis (not strictly "obstructive" but present similarly) ^[2][3]:

• Hepatocyte dysfunction (hepatitis, end-stage liver disease)
• Drugs (anabolic steroids, OCP, chlorpromazine, arsenic)
• Primary biliary cholangitis (autoimmune destruction of small ducts)
• No enteric intake / TPN (↓CCK → ↓GB contraction)
• Intrahepatic cholestasis of pregnancy (associated with ↑oestrogen)
• Massive liver SOL compressing bilateral bile ducts (very uncommon)

Per Prof R Poon's lecture ^[9]:

• Hepatomegaly secondary to biliary obstruction
• Hepatomegaly due to metastases or HCC
• Lymph node metastases to the coeliac axis or porta hepatis
• Carcinoma of stomach with metastatic lymph node in the porta hepatis
• Distended stomach due to duodenal obstruction by tumour which obstructs the bile duct as well

• Why? Bile salts are needed in the gut to emulsify fats → absorb fat-soluble vitamin K → vitamin K is a cofactor for hepatic synthesis of clotting factors II, VII, IX, X (and proteins C and S)
• In obstruction: no bile in gut → vitamin K malabsorption → deficiency of vitamin K-dependent clotting factors → coagulopathy ^[1]
• Impaired clotting factor synthesis also occurs in prolonged obstruction as the liver parenchyma suffers from cholestasis-induced damage ^[1]
• Clinical relevance: must correct coagulopathy (give IV/IM vitamin K) before any invasive procedure (ERCP, PTC, surgery)

• Why? The liver's Kupffer cells (part of the reticuloendothelial system) normally clear portal-venous endotoxins absorbed from the gut. In obstructive jaundice:
  • Endotoxaemia occurs because the liver is unable to defend against gut endotoxins ^[1]
  • Impaired reticuloendothelial function ^[1]
  • Impaired cell-mediated immunity ^[1]
  • Absent bile salts in gut → bacterial overgrowth → increased translocation
• Patients with MBO are at significantly increased risk of post-operative sepsis

• Why? Impaired protein synthesis by the cholestatic liver → inadequate collagen deposition and tissue repair ^[1]
• Nutrition is also impaired (fat malabsorption, anorexia from malignancy)

• Bile salts and bilirubin are directly nephrotoxic
• Endotoxaemia promotes renal vasoconstriction
• Dehydration from anorexia/vomiting
• Clinical relevance: adequate hydration and careful monitoring of renal function peri-operatively

• Prolonged cholestasis → secondary biliary cirrhosis (if chronic)
• Cholestasis impairs hepatocyte function → reduced drug metabolism, reduced synthetic function
• Effect on liver function is slow in onset ^[3] — this is why drainage can sometimes wait for proper imaging

1. Mechanical obstruction (majority): physical blockage by stone, tumour, stricture
2. Functional obstruction: sphincter of Oddi dysfunction (intermittent, no structural lesion)

1. Benign: gallstones, benign strictures, chronic pancreatitis, choledochal cysts, PSC, Mirizzi syndrome, parasites
2. Malignant: CA head of pancreas, cholangiocarcinoma, CA ampulla of Vater, CA duodenum, CA gallbladder, metastatic lymphadenopathy

This is the single most important clinical question when you see obstructive jaundice. The lecture slides and senior notes emphasise this distinction ^[2][3]:

• Rule out carotenaemia (eating lots of carrots/mangoes — yellow skin but NO scleral icterus) and drug-induced skin discolouration (rifampicin, quinacrine, TCMs) ^[3]

• Conjugated: tea-coloured urine, pale stools, pruritus ± scratch marks
• Unconjugated: none of the above (normal urine, normal stools, no pruritus) — think haemolysis or Gilbert's ^[3]

• Medical: normal-coloured urine and stool ^[2]
  • Pre-hepatic (haemolysis, Gilbert's): palpitations, dizziness
  • Hepatic (hepatitis, CLD, drugs): fever, RUQ pain, N/V
• Surgical: tea-coloured urine, pale stools, steatorrhoea ^[2]

As per the table above — key discriminators are age, pain, progression, and constitutional symptoms ^[2][3].

• Cholangitis: Charcot's triad (fever + jaundice + RUQ pain); Reynold's pentad (add hypotension + confusion) ^[3]
• CBD stone: episodic painful jaundice, history of gallstone disease, prior ERCP/surgery ^[3]
• Malignant biliary obstruction: new onset, painless, progressive jaundice in old individuals; CA pancreas: constant, dull, boring epigastric pain radiating to back (usually a late feature); constitutional symptoms (LOA, LOW); metastatic symptoms ^[3]
• Post-ERCP jaundice ^[3]

Mnemonic for hepatic causes of jaundice: "All Medical Doctors Aren't Very Happy" = Alcohol, Metabolic, Drugs, Autoimmune, Virus, HCC ^[2][3]

These are "medical" causes — the bile ducts are structurally patent, but bile formation or small-duct flow is impaired:

For intrahepatic cholestasis workup: clinical Hx for drugs, TPN use and infiltrative diseases → AMA and Ig pattern for PBC → viral hepatitis serology → liver biopsy if persistently > 2× ULN for > 6 months without identifiable cause ^[14]

This is the true "surgical" obstructive jaundice and forms the core of our differential. Organised by relationship to the duct wall ^[1][2][3]:

When a patient develops jaundice after surgery, the differential shifts:

• Pre-hepatic: haemolysis (e.g., blood transfusion reaction)
• Hepatic: halogenated anaesthetics (hepatotoxicity), sepsis, intra-/post-operative hypotension → ischaemic hepatitis
• Post-hepatic: biliary injury (surgical damage to bile duct during cholecystectomy — most feared complication)

Per Prof R Poon's lecture ^[9]:

• Hepatomegaly (mild) due to biliary obstruction
• Hepatomegaly due to metastasis or HCC
• LN metastasis to coeliac axis and porta hepatis
• CA stomach with metastatic LN in porta hepatis
• Tumour obstructing both duodenum and bile duct → distended stomach + jaundice

When cholangiocarcinoma is suspected, the differential includes:

• Choledocholithiasis
• Viral hepatitis
• Hepatocellular carcinoma (AFP helps distinguish — AFP > 400 is diagnostic of HCC ^[3])
• Other malignant biliary obstruction: pancreatic cancer, CA ampulla of Vater
• Intrahepatic cholestasis: PSC, PBC
• IgG4-related sclerosing cholangitis — important mimic of cholangiocarcinoma; check serum IgG4 ^[7]

The diagnosis of obstructive jaundice rests on recognising the cholestatic (ductal) LFT pattern ^[3][10][13]:

The classical obstructive pattern (↑bilirubin, ↑↑↑ALP/GGT >> mildly ↑AST/ALT) is more often seen in malignancy than in gallstones ^[3][10] — because malignant obstruction tends to be more complete and sustained.

A key distinction: ↑INR may be due to hepatocellular dysfunction (unresponsive to vitamin K) or cholestasis (responsive to IV vitamin K) ^[13]. This is a critical clinical test — if you give parenteral vitamin K and the INR corrects within 24–48 hours, the coagulopathy is from malabsorption (obstructive). If it doesn't correct, the liver parenchyma is failing.

The imaging hallmark of extrahepatic obstruction is dilatation of the biliary tree proximal to the obstruction ^[3][10]:

When obstruction is complicated by infection, the diagnosis shifts to acute cholangitis. The Tokyo Guidelines provide formal criteria ^[1]:

Suspected diagnosis — requires BOTH of:

1. ONE of the following: fever or shaking chills OR laboratory evidence of inflammation (abnormal WBC, ↑CRP)
2. ONE of the following: jaundice OR abnormal liver chemistries (↑AST/ALT/ALP/GGT)

Definite diagnosis — in addition to meeting suspected criteria, requires BOTH of:

1. Biliary dilatation on imaging
2. Evidence of aetiology on imaging (e.g., stone, stricture, stent)

Severity grading:

• Grade I (mild): does not meet criteria for Grade II or III
• Grade II (moderate): any two of — WBC > 12,000 or < 4,000; fever ≥ 39°C; age ≥ 75 y; bilirubin ≥ 85 µmol/L; albumin < 0.7× LLN
• Grade III (severe): organ dysfunction — cardiovascular (hypotension requiring vasopressors), neurological (altered consciousness), respiratory, renal, hepatic, or haematological (DIC)

Before we draw the flowchart, let's understand the logic behind it ^[3][10]:

• Management of biliary sepsis is the FIRST priority → it can quickly kill! ^[3][10]
• Drainage is NOT ALWAYS URGENT — the effect on liver function is slow in onset → drainage should ideally be done after CT abdomen if there are no indications for early decompression, to allow better tumour assessment ^[3][10]
• Endoscopic stenting will affect evaluation of the tumour on subsequent imaging → do CT before ERCP whenever possible ^[12]
• Indications for early drainage ^[3][10]:
  • Biliary sepsis or stones (stone formation usually indicates a contaminated biliary system)
  • Poor liver function due to prolonged cholestasis → must be optimised pre-operatively
  • Klatskin tumour — drainage allows normalisation of liver function, which is important for pre-operative ICG testing and post-operative monitoring (as hepatectomy is part of management)
• Drainage procedures carry significant risks → always balance risk vs benefit ^[3][10]
• In HK, delayed drainage is often not realistic as patients need to wait months for OT ^[3]

This is a nuanced topic. The key principle:

Tissue diagnosis is NOT mandatory if the tumour is potentially resectable ^[4]. A resectable tumour on imaging should be resected regardless of biopsy result (a negative biopsy does not exclude malignancy; a biopsy delay could allow progression to unresectable disease).

Tissue diagnosis IS required when ^[4]:

• CT failed to demonstrate typical features of the suspected malignancy
• Before chemotherapy (oncologists need a pathological diagnosis to select regimen)
• Suspected secondary metastasis to pancreas (e.g., from RCC, lung, breast — different treatment)
• Uncertain diagnosis where management would change based on histology (e.g., IgG4-related disease vs cholangiocarcinoma)

Methods of tissue diagnosis:

ERCP with sphincterotomy + CBD stone removal is the standard of care ^[2]:

• Sphincterotomy: electrocautery incision of the sphincter of Oddi to widen the papillary opening
• Methods of stone removal ^[2]:
  • Wire baskets (Dormia basket)
  • Stone extraction balloon
  • Mechanical lithotripsy (for large stones that cannot be extracted whole)

Indicated if ERCP is contraindicated (e.g., altered anatomy) ^[2]:

• Approaches:
  • Transcystic (1st line): catheter via cystic duct → cholangiogram → balloon extraction
  • Choledochotomy (2nd line): incise CBD → remove stones → choledochoscopy to confirm clearance
  • Percutaneous choledochoscopy
• Advantage: can be performed as one-stage surgery together with laparoscopic cholecystectomy ^[2]
• After exploration: T-tube may be inserted for subsequent cholangiogram and bile drainage, but T-tubes are shown to increase complications (infection, bile leak, tube dislodgement) → primary closure preferred if existing biliary stent ^[2]

• Elective laparoscopic cholecystectomy after stone clearance — still ~5% risk of recurrent biliary events (residual/dropped stones, primary RPC stones) ^[2]
• Recommended within 2–6 weeks of ERCP stone clearance

Assessment of patient status (good/bad) ^[1]:

• Age and concomitant medical illness
• Hidden medical illness: CXR, ECG, spirometry
• Nutrition: LFT (albumin)
• Fluid and electrolytes: RFT
• Coagulopathy: CBC, clotting profile

Assessment of tumour status (confined/spread) ^[1]:

Clinical signs of inoperability ^[1]:

• Irregular surface hepatomegaly (liver metastases)
• Troisier's sign (Virchow's node) — left supraclavicular LN
• Blumer's shelf — peritoneal metastasis palpable on DRE
• Sister Mary Joseph nodules — periumbilical metastatic nodule
• Ascites — peritoneal metastasis

Radiological signs of inoperability ^[1]:

• LN metastasis (retropancreatic, paracoeliac, paraaortic)
• Distant metastasis (lung, peritoneum, liver)
• Arterial involvement: SMA, coeliac axis (encasement > 180° is absolute contraindication) ^[4]
• Venous involvement: SMV, portal vein
  • Portal vein involvement is NOT an absolute contraindication ^[1] — venous resection with reconstruction is appropriate to improve resectability and achieve R0 resection (absence of microscopic residual tumour). QMH may consider resection of portal vein depending on the extent of involvement ^[1]
  • However, unreconstructible SMV/portal vein involvement (no suitable vessel proximal and distal for interposition graft) IS an absolute contraindication ^[4]

Unresectability criteria (for cholangiocarcinoma) ^[6][22]:

• Invasion of major vessels (main PV, main hepatic artery, coeliac trunk, SMA, SMV)
• Extensive involvement of biliary tree (bilaterally > 2° radicles)
• LN metastasis beyond regional nodes (retropancreatic, paracoeliac, paraaortic)
• Distal organ metastasis (lung, peritoneum)
• Inadequate liver remnant if hepatectomy is required ^[22]

The flowchart from lecture ^[1]:

No promise of resection until laparotomy findings document absence of spread ^[1]. Look for peritoneal nodules after laparotomy before resection → send for frozen section to rule out malignancy if suspicious ^[1].

Acute management ^[20][23]:

• Resuscitation + antibiotics + biliary drainage (ERCP difficult for intrahepatic stones → PTBD or T-tube drainage or hepaticocutaneojejunostomy (HCJ) preferred) ^[20]

Long-term management ^[23]:

• Regular ductal clearance: USG surveillance, ERCP for stone retrieval / stricture dilatation
• Hepatobiliary resection + biliary-enteric anastomosis (hepaticojejunostomy): resect areas of recurrent infection, biliary stasis, and hepatic atrophy ^[1]
  • Indication: atrophic liver segment, failed non-operative treatment, suspected cholangioCA ^[20]
  • Hepaticojejunostomy is frequently required; standard biliary drainage procedures (choledochoduodenostomy or choledochojejunostomy) are contraindicated since residual strictured segments may not drain adequately ^[1]
  • May include cutaneous stoma for future percutaneous choledochoscopy access ^[23]
• Surveillance for cholangioCA: clinical deterioration, unexplained ↑cholestasis measures; consider routine cytology brushing during ERCP ^[23]

• Dominant strictures: ERCP balloon dilatation ± short-term stenting
• Cholangitis episodes: antibiotics + drainage
• Medical therapy: ursodeoxycholic acid (UDCA) — evidence debated; may improve biochemistry but uncertain effect on disease progression
• Liver transplantation: definitive treatment for end-stage PSC

Why does this happen?

Bile is normally sterile. However, when the biliary tree is obstructed, the flushing action of bile ceases → bile stasis → bacteria ascend from the duodenum or enter via the portal venous system → colonise the stagnant bile → overwhelming infection within a closed space ^[1][24].

• Combination of biliary obstruction and significant bacterial contamination is required for cholangitis — obstruction without bacteria = obstructive jaundice; obstruction with bacterial overgrowth = acute cholangitis ^[1]
• Normal barrier mechanisms are disrupted by obstruction: continuous flushing, bacteriostatic bile salts, biliary mucous IgA, and sphincter of Oddi all fail ^[1]
• After endoscopic sphincterotomy, biliary stent insertion, or choledochal surgery, the barrier is permanently disrupted → these patients are at perpetually higher risk of cholangitis ^[1]
• Foreign body (stent) serves as a nidus for bacterial colonisation ^[1]

Organisms: E. coli, Klebsiella pneumoniae, Enterococcus sp., Enterobacter sp., Bacteroides fragilis ^[1]

Clinical presentation:

• Charcot's triad (present in 2/3): fever + RUQ pain + jaundice ^[1]
• Reynold's pentad (present in < 10%): adds hypotension + altered mental status — indicates suppurative cholangitis with septic shock progressing to multiorgan failure ^[1]

Why is it so dangerous? The biliary system drains into the portal venous system → bacteria and endotoxins have direct access to the systemic circulation → bacteraemia → septic shock → multiorgan failure if not drained urgently. If biliary drainage is not relieved, antibiotics cannot be excreted into the biliary tract and cannot eradicate the infection ^[3] — the infected bile acts as an undrained abscess.

Why does obstruction cause bleeding?

The mechanism is twofold ^[1]:

1. Vitamin K malabsorption: Bile salts are essential for emulsification and absorption of dietary fats, including fat-soluble vitamin K. No bile in the gut → no fat emulsification → vitamin K is not absorbed → the liver cannot synthesise vitamin K-dependent clotting factors II, VII, IX, X (and proteins C and S) → ↑PT/INR → coagulopathy ^[1][3][10]

2. Impaired clotting factor synthesis: In prolonged obstruction, cholestasis-induced hepatocyte damage impairs the liver's synthetic capacity directly, compounding the vitamin K deficiency ^[1]

Clinical significance: Patients may present with easy bruising, petechiae, prolonged bleeding from venepuncture sites, or frank haemorrhage. This is critical pre-operatively — IV vitamin K and FFP must be given during surgery to correct the coagulopathy ^[1].

A key clinical test: ↑INR may be due to hepatocellular dysfunction (unresponsive to vitamin K) or cholestasis (responsive to IV vitamin K) ^[13]. If parenteral vitamin K corrects the INR within 24–48 hours, the coagulopathy is from malabsorption (obstructive) — a reassuring sign that the liver's synthetic machinery is intact.

Why does this happen?

Without bile salts in the gut lumen, fat cannot be emulsified into micelles → fat is not absorbed → passes through as steatorrhoea (fatty, loose, floating, foul-smelling stools) ^[3][10][13].

Vitamin deficiency (A, D, E, K) — all fat-soluble vitamins are malabsorbed ^[3][10][13]:

In chronic obstruction (e.g., PSC), vitamin A and D deficiency are more common and require supplementation ^[25].

Why are obstructed patients prone to infection?

This goes beyond cholangitis. Obstructive jaundice causes generalised immune suppression through several mechanisms ^[1]:

• Endotoxaemia: The liver's Kupffer cells (resident macrophages of the reticuloendothelial system) normally clear endotoxins absorbed from the gut via the portal vein. In cholestasis, Kupffer cell function is impaired → endotoxins escape into the systemic circulation → trigger systemic inflammatory response ^[1]
• Impaired reticuloendothelial function: Beyond Kupffer cells, the entire reticuloendothelial system (spleen, lymph nodes) is depressed ^[1]
• Impaired cell-mediated immunity: T-cell function and neutrophil phagocytosis are suppressed by accumulated bile salts and bilirubin ^[1]
• Absent bile salts in gut → bacterial overgrowth → increased bacterial translocation across the gut mucosa

Clinical relevance: Patients with MBO are at significantly increased risk of post-operative sepsis, wound infection, and pneumonia. Perioperative antibiotic prophylaxis is essential.

Why? ^[1]

• Impaired protein synthesis by the cholestatic liver → inadequate collagen deposition and tissue repair
• Malnutrition (cancer cachexia + fat malabsorption) → protein-calorie deficit
• Immune dysfunction (see above) → impaired inflammatory response needed for wound healing

Studies from the 1980s showed that jaundiced patients had higher rates of anastomotic leak, haemorrhage, and renal failure ^[19]. This is the historical rationale for pre-operative biliary drainage.

Why?

Multiple mechanisms converge to damage the kidneys in obstructive jaundice:

• Bilirubin and bile salts are directly nephrotoxic — they deposit in renal tubules and cause tubular injury
• Endotoxaemia promotes renal vasoconstriction (similar mechanism to hepatorenal syndrome in cirrhosis)
• Dehydration from anorexia, vomiting, and bile losses (if external PTBD drainage)
• Contrast nephropathy from CT contrast or cholangiographic contrast during investigation

In prolonged or chronic obstruction ^[3][10][13]:

• Liver decompensation: encephalopathy, hepatic fetor, worsening ascites ^[3][13]
• Mechanism: prolonged cholestasis → secondary biliary cirrhosis → portal hypertension → hepatic synthetic failure
• This is a late complication but is the eventual endpoint if obstruction is not relieved

Due to stone disease ^[3][13] — a CBD stone impacted at the ampulla of Vater obstructs both the bile duct AND the pancreatic duct → reflux of bile into the pancreatic duct → premature activation of pancreatic enzymes within the gland → autodigestion → acute pancreatitis.

• Presents with abdominal pain radiating to the back with nausea and vomiting ^[13]
• Gallstone pancreatitis is one of the two most common complications of CBD stones (the other being cholangitis) ^[1]

Acute complications (5–10%) ^[17]:

• Bleeding into biliary system (most common) — puncture of hepatic artery or portal vein branches during needle insertion through the portal triad
• Infection: septic shock — introduction of bacteria during the procedure
• Pancreatitis (due to CBD damage — rare)
• Puncturing other organs (e.g., lungs, kidneys) — the needle traverses the liver and can miss

Delayed complications (45–50%) ^[17]:

• Biliary sepsis (cholangitis) — catheter acts as a foreign body and nidus for infection
• Catheter migration — the external tube dislodges
• Bile leak (→ peritoneal irritation, bile peritonitis)
• Metastatic seeding — tumour cells spread along the needle tract (this is a real concern in malignancy)
• Skin infection at the insertion site
• Electrolyte and fluid loss — simple external PTBD causes loss of bile externally → dehydration, hyponatraemia, hypokalaemia, metabolic acidosis ^[1]

Pre-operative biliary drainage has increased risk of serious complications ^[19]:

• Pancreatitis (7%)
• Cholangitis (26%)
• Blocked stent (15%)
• Bleeding (2%)
• Perforation (2%)

However, surgery-related complications were comparable with or without drainage ^[19]. This is the core of the debate — routine pre-operative biliary drainage in patients undergoing surgery for CA pancreas increases rate of complications ^[19].

Jaundice itself causes coagulopathy, malabsorption, malnutrition and immune dysfunction; studies in the 1980s showed higher anastomotic leak, haemorrhage and renal failure in jaundiced patients ^[19]. But the drainage procedure introduces its own set of complications.

From prospective randomised trials ^[27]:

This means: stents are better for patients with short life expectancy (avoid major surgery), while surgical bypass is better for patients who might live longer (avoids repeated stent changes/blockages).

Early complications:

• Intra-operative haemorrhage — the operation is adjacent to major vessels (SMA, PV, SMV)
• Injury to adjacent organs (liver, kidneys, bowels)
• Delayed gastric emptying (common) — the stomach loses its normal neural and hormonal coordination after the duodenum is removed
• Pancreatitis
• Pancreatic fistula (common) — leakage from the pancreaticojejunostomy; defined as drain amylase > 3× ULN after post-op day 3 ^[1]
• Pancreatic anastomotic leak — the pancreaticojejunostomy is the "Achilles heel" of the Whipple (soft pancreas + narrow duct = highest risk)
• Biliary anastomotic breakdown
• Overall perioperative mortality: ~26–28% in older series (now ~2–5% in high-volume centres) ^[10]

Late complications:

• Exocrine insufficiency → malabsorption and steatorrhoea (need lifelong PERT)
• Endocrine insufficiency → diabetes mellitus (loss of islet mass)
• Gastric stasis — particularly in patients undergoing pylorus-preserving Whipple's operation ^[1]
• Marginal ulceration at the gastrojejunostomy
• Dumping syndrome (more common with classic Whipple than PPPD)

• Highly lethal malignancy
• 8% diagnosed when still localised; 27% when spread to regional LNs; 53% when already metastatic (majority) ^[1]
• 5-year survival after pancreaticoduodenectomy: node-negative = 25–30%; node-positive = 10% ^[1]
• Median survival for unresectable locally advanced disease = 12 months ^[1]
• Median survival for metastatic disease to liver = 6 months ^[1]

• Only ~20% operable at presentation ^[6][22]
• Poor prognosis even after resection; adjuvant chemotherapy improves survival modestly

• 10% disease-related mortality (7% secondary biliary cirrhosis, 3% cholangiocarcinoma) ^[26]
• 10% concomitant cholangioCA at time of presentation ^[26]