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Phys Topicsgastrointestinal

Phys · gastrointestinal

Acute Pancreatitis

Also known as acute pancreatitis · haemorrhagic pancreatitis · necrotising pancreatitis · gallstone pancreatitis · alcoholic pancreatitis · interstitial oedematous pancreatitis · walled-off necrosis · pseudocyst · autoimmune pancreatitis

Consultant-physician-depth guide to acute pancreatitis — premature intracellular trypsin activation and the I GET SMASHED aetiology, classic epigastric pain radiating to the back, lipase above 3x ULN as the diagnostic anchor, the Revised Atlanta Classification severity tiers, BISAP and Ranson scoring, WATERFALL moderate lactated Ringer's (not aggressive fluids), early enteral feeding (ACG 2013: immediately in mild disease if no nausea), ERCP for cholangitis only, the step-up approach for infected necrosis after PANTER, and same-admission cholecystectomy for mild gallstone pancreatitis. Structured for FRACP DWE and DCE preparation.

high20 referencesUpdated 4 Sept 202630 min readSource-verified · Sept 2026

Checked against its sources on 4 Sept 2026

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FRACP DWEFRACP DCEMRCP Part 1MRCP Part 2MRCP PACESABIM Internal Medicine

Red flags

  • Persistent organ failure beyond 48 hours defining severe pancreatitis per Revised Atlanta Classification
  • Infected pancreatic necrosis requiring urgent intervention and antibiotics
  • ACG 2013: concurrent cholangitis with biliary pancreatitis requires ERCP within 24 hours — not ERCP for pancreatitis per se
  • Cullen or Grey Turner sign indicating haemorrhagic necrotising pancreatitis
  • Compartment syndrome from massive fluid resuscitation
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Target exams

FRACP DWEFRACP DCEMRCP Part 1MRCP Part 2MRCP PACESABIM Internal Medicine

Red flags

  • Persistent organ failure beyond 48 hours defining severe pancreatitis per Revised Atlanta Classification
  • Infected pancreatic necrosis requiring urgent intervention and antibiotics
  • ACG 2013: concurrent cholangitis with biliary pancreatitis requires ERCP within 24 hours — not ERCP for pancreatitis per se
  • Cullen or Grey Turner sign indicating haemorrhagic necrotising pancreatitis
  • Compartment syndrome from massive fluid resuscitation

Acute Pancreatitis

The one-line ward answer

Acute pancreatitis is premature intracellular trypsin activation that autodigests the gland — diagnose it with two of three (characteristic pain, lipase over three times the upper limit of normal, characteristic imaging), and manage the modern bundle, not the old dogmas. Gallstones and alcohol together cause about 80 per cent of episodes. The single biggest change in a decade: aggressive fluids cause harm (WATERFALL), bowel rest is wrong, prophylactic antibiotics do not help, and open necrosectomy is a last resort.[9][2][3]

Meet the patient

A 58-year-old man arrives at 3am with severe epigastric pain boring through to his back, vomiting that brings no relief, and a pulse of 118. He drinks heavily and his lipase is eight times the upper limit of normal, and the ultrasound shows a gallstone.[2]

The two questions that decide his course are how severe this will become, and whether the old reflexes — wide-open fluids, nil by mouth, prophylactic antibiotics — will be resisted. Hold those two questions and the modern bundle below slots into place.[1]

Hasibeder: eighty per cent of episodes are related either to gallstones or to alcohol. Moody: gallstones account for 30 to 50 per cent of presentations. A UK series (Davidson, 391 episodes) found gallstones in 56 per cent and alcohol in 16 per cent; Hu notes that the mix varies by region. Overall mortality is approximately 2 per cent, rising to approximately 30 per cent when persistent organ failure is present. The single most important paradigm shift in the last decade is the move away from uncontrolled aggressive fluid resuscitation (WATERFALL showed harm) and the abandonment of prolonged bowel rest in favour of early enteral feeding. [9][8][10][14][3][2]

The four overturned dogmas

Prophylactic antibiotics do not help, aggressive fluids cause harm, nil by mouth is wrong, and open necrosectomy is a last resort. In every long case, state the severity with the Revised Atlanta Classification, give the goal-directed fluid plan, start early oral feeding, and justify each decision with the trial evidence.[1]


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References20ShowHide
  1. [1]Banks PA, Bollen TL, Dervenis C, et al. Classification of acute pancreatitis--2012: revision of the Atlanta classification and definitions by international consensus Gut, 2013.PMID 23100216
  2. [2]Tenner S, Vege SS, Sheth SG, et al. American College of Gastroenterology Guidelines: Management of Acute Pancreatitis Am J Gastroenterol, 2024.PMID 38857482
  3. [3]de-Madaria E, Buxbaum JL, Maisonneuve P, et al. Aggressive or Moderate Fluid Resuscitation in Acute Pancreatitis N Engl J Med, 2022.PMID 36103415
  4. [4]van Santvoort HC, Besselink MG, Bakker OJ, et al. A step-up approach or open necrosectomy for necrotizing pancreatitis N Engl J Med, 2010.PMID 20410514
  5. [5]Besselink MG, van Santvoort HC, Buskens E, et al. Probiotic prophylaxis in predicted severe acute pancreatitis: a randomised, double-blind, placebo-controlled trial Lancet, 2008.PMID 18279948
  6. [6]Wu BU, Johannes RS, Sun X, Tabak Y, Conwell DL, Banks PA The early prediction of mortality in acute pancreatitis: a large population-based study Gut, 2008.PMID 18519429
  7. [7]Papachristou GI, Muddana V, Yadav D, et al. Comparison of BISAP, Ranson's, APACHE-II, and CTSI scores in predicting organ failure, complications, and mortality in acute pancreatitis Am J Gastroenterol, 2010.PMID 19861954
  8. [8]Moody N, Adiamah A, Yanni F, et al. Meta-analysis of randomized clinical trials of early versus delayed cholecystectomy for mild gallstone pancreatitis Br J Surg, 2019.PMID 31268184
  9. [9]Hasibeder WR, Torgersen C, Rieger M Critical care of the patient with acute pancreatitis Anaesth Intensive Care, 2009.PMID 19400483
  10. [10]Davidson BR, Neoptolemos JP, Leese T Biochemical prediction of gallstones in acute pancreatitis: a prospective study of three systems Br J Surg, 1988.PMID 2450614
  11. [11]Poropat G, Goričanec K, Lacković A, et al. Systematic Review with Trial Sequential Analysis of Prophylactic Antibiotics for Acute Pancreatitis Antibiotics (Basel), 2022.PMID 36139970
  12. [12]Lee HW, Moon SH, Kim MH Relapse rate and predictors of relapse in a large single center cohort of type 1 autoimmune pancreatitis: long-term follow-up results after steroid therapy with short-duration maintenance treatment J Gastroenterol, 2018.PMID 29362937
  13. [13]Wu BU, Hwang JQ, Gardner TH, et al. Lactated Ringer's solution reduces systemic inflammation compared with saline in patients with acute pancreatitis Clin Gastroenterol Hepatol, 2011.PMID 21645639
  14. [14]Hu Q, Hu Y, Tan C Acute pancreatitis: mechanisms and therapeutic approaches Signal Transduct Target Ther, 2026.PMID 41530118
  15. [15]Ranson JH The timing of biliary surgery in acute pancreatitis Ann Surg, 1979.PMID 443917
  16. [16]Vinish DB, Abishek V, Sujatha K Role of bedside pancreatic scores and C-reactive protein in predicting pancreatic fluid collections and necrosis Indian J Gastroenterol, 2017.PMID 28181127
  17. [17]Inayat F, Zafar F, Baig AS Hypertriglyceridemic Pancreatitis Treated with Insulin Therapy: A Comparative Review of 34 Cases Cureus, 2018.PMID 30648042
  18. [18]Tenner S, Baillie J, DeWitt J, Vege SS American College of Gastroenterology guideline: management of acute pancreatitis Am J Gastroenterol, 2013.PMID 23896955
  19. [19]Szatmary P, Grammatikopoulos T, Cai W, et al. Acute Pancreatitis: Diagnosis and Treatment Drugs, 2022.PMID 36074322
  20. [20]Working Group IAP/APA Acute Pancreatitis Guidelines IAP/APA evidence-based guidelines for the management of acute pancreatitis Pancreatology, 2013.PMID 24054878

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