Necrotising pancreatitis: timing of intervention (adults)
Pancreatic or peripancreatic necrosis on contrast CT. Manage with an HPB team: surgery, interventional radiology, endoscopy and ICU.
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Hepatobiliary SurgeryManagement
Necrotising Pancreatitis: Timing of Intervention
Necrotising Pancreatitis: Timing of Intervention: Necrotising pancreatitis: timing of intervention (adults) → Adults only. No on-site HPB team: discuss ...
Pathway Overview
19 steps
Algorithm Steps
19 total
01Start 02Warning Adults only. No on-site HPB team: discuss early and transfer
Transfer needs HPB surgery, interventional radiology and therapeutic endoscopy. Children: paediatric specialist advice.
- Transfer before the patient is too unstable to move
03Action Resuscitate and assess severity
Severe = organ failure lasting more than 48 h (revised Atlanta). Organ failure: ICU or HDU.
- Avoid over-resuscitation; measure intra-abdominal (bladder) pressure regularly
- Enteral nutrition: oral, nasogastric or nasojejunal; parenteral only if enteral fails
- No prophylactic antibiotics for sterile necrosis
- Repeat contrast CT if the patient deteriorates or does not improve
04Warning Emergency complication at any stage: act now, do not wait 4 weeks
Cholangitis: IV antibiotics and ERCP within 24 h. At an early laparotomy, do not debride the pancreas.
- Abdominal compartment syndrome (bladder pressure >20 mmHg with new organ failure): medical and minimally invasive measures (e.g. drain ascites); decompressive laparotomy if these fail
- Active bleeding (e.g. pseudoaneurysm): CT angiography and angioembolisation; surgery if this fails
- Bowel ischaemia, perforation or acute necrotising cholecystitis: emergency surgery
05Warning Before drainage or surgery: check bleeding risk, pregnancy and goals of care
Do not let these checks delay emergency bleeding control or decompression.
- Anticoagulant, antiplatelet or low platelets: plan with the proceduralist
- Pregnancy: involve obstetrics before imaging, drugs or intervention
- Frailty or limits of care: agree goals with the patient and family
06Decision Infected necrosis suspected?
Gas in the collection on CT, or sepsis or deterioration with no other source.
- Positive blood culture with no other source supports infection
- FNA is not routine; use it only if the result would change management
- If Yes
07Action Infected necrosis: start antibiotics, delay drainage
Stable: antibiotics first; aim to delay any drainage until the necrosis is walled off (about 4 weeks).
- Antibiotic that penetrates necrosis, such as a carbapenem; choose per local guidance, allergy and renal function
- Routine antifungals are not needed
- Immediate drainage is not better than postponed drainage and needs more procedures (POINTER RCT)
- Some patients recover on antibiotics alone (39% in POINTER)
08Decision Deteriorating or not improving on antibiotics?
Worsening sepsis or organ failure despite antibiotics and ICU support.
- If Yes
09Action Deteriorating: drain now, usually percutaneous
First step of the step-up approach, even before 4 weeks. Delay any necrosectomy until walled off if possible.
- Before 4 weeks: percutaneous (retroperitoneal route if possible); endoscopic transluminal only if the collection is walled off and next to the stomach or duodenum
- Route chosen by the HPB team by anatomy and local skills
10Action Drainage needed: step-up approach, drain first
Endoscopic (EUS-guided transluminal) drainage first when feasible; percutaneous if not reachable or as an add-on. Many patients need nothing more.
- Drainage alone fully resolves infection in 25-60%; in others it delays surgery to a safer time
- Before transluminal drainage: contrast CT to exclude a pseudoaneurysm next to the collection; embolise it first
- Lumen-apposing metal stent: remove or replace within 4 weeks (bleeding, buried stent)
- Multiple or larger drains may be needed
11Decision Improving after drainage?
Sepsis and organ function settling; collection smaller.
- If Yes
12End Recovery and follow-up
Gallstone cause: delay cholecystectomy until collections resolve, or stabilise after at least 6-8 weeks, and inflammation settles. Screen for diabetes and exocrine insufficiency.
- Treat the cause (gallstones, alcohol, high triglycerides) to prevent recurrence
If No13Action Not improving after drainage: minimally invasive necrosectomy
Endoscopic transluminal necrosectomy or video-assisted retroperitoneal debridement (VARD). Open necrosectomy only if these fail or are not possible.
- Minimally invasive methods cause less new organ failure than open surgery
- Selected walled-off necrosis or disconnected duct: single-stage surgical transgastric necrosectomy is an option
- Open necrosectomy: last resort, in an experienced centre
- Path rejoins step 12Shared downstream outcome
If No14Action Stable on antibiotics: continue and wait for walled-off necrosis
Reassess often. Drainage may not be needed. Re-image when walled off (usually after 4 weeks) or if the patient deteriorates.
- Deteriorates at any time: drain now
- Infection resolves: no drainage; follow up
15Decision Drainage needed once walled off?
Infection or symptoms persist when walled off (usually after 4 weeks), or deterioration at any time.
- If Yes
- Path rejoins step 10Shared downstream outcome
If No- Path rejoins step 12Shared downstream outcome
If No16Action Sterile necrosis: supportive care, no routine intervention
Most settle without intervention. No antibiotics. Infection suspected later: follow the infected-necrosis steps above.
- Re-image if new symptoms, sepsis or deterioration
17Decision Sterile: reason to intervene after 4 weeks?
Ongoing organ failure; gastric outlet, bile duct or bowel obstruction; disconnected duct; symptomatic or growing collection; ongoing pain after 8 weeks.
- If Yes
18Action Sterile with an indication: step-up approach
Drain first (percutaneous or endoscopic); necrosectomy only if drainage fails. HPB team decides route and timing.
- Path rejoins step 10Shared downstream outcome
If No19End Sterile, no indication: observe and follow up
Most collections resolve. Re-image if symptoms. Gallstone cause: delay cholecystectomy until collections resolve, or stabilise after at least 6-8 weeks. Screen for diabetes and exocrine insufficiency.
Guideline Source
American College of Gastroenterology Guidelines: Management of Acute Pancreatitis (Tenner et al., Am J Gastroenterol 2024)
Clinical Safety Information
Clinical Decision Support — Not a Substitute for Clinical Judgment
Individual patient factors may require deviation from these recommendations.
Known Limitations
- Adults only. Decisions need an HPB team; transfer early if there is no interventional radiology, therapeutic endoscopy or HPB surgery on site.
- Timing is individual: aim for about 4 weeks, but bleeding, compartment syndrome, bowel ischaemia or cholangitis need action now.
- Does not cover acute pancreatitis without necrosis, or chronic pancreatitis.
- Evidence for timing and route of intervention is mostly observational; the step-up and POINTER trials are the main RCTs.
Contraindicated Populations
Children and adolescents under 18 years (paediatric specialist care)
Applicable Regions
USAUUKEU
AU: No Australian national acute pancreatitis guideline; practice follows IAP 2025, ACG 2024 and WSES 2019. Antibiotic choice: Therapeutic Guidelines (eTG) and local stewardship.
EU: IAP Revised Guidelines on Acute Pancreatitis 2025 (Pancreatology 2025;25:770-814) and WSES 2019 severe acute pancreatitis guidelines.
UK: NICE NG104 Pancreatitis (2018).
US: ACG 2024 acute pancreatitis guideline; AGA 2020 clinical practice update on pancreatic necrosis.
Version 2Next review: 2027-09-30
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Frequently Asked Questions
What is the Necrotising Pancreatitis: Timing of Intervention?
The Necrotising Pancreatitis: Timing of Intervention is a management clinical algorithm for Hepatobiliary Surgery. It provides a structured decision tree to guide clinical decision-making, based on American College of Gastroenterology Guidelines: Management of Acute Pancreatitis (Tenner et al., Am J Gastroenterol 2024).
What guideline is the Necrotising Pancreatitis: Timing of Intervention based on?
This algorithm is based on American College of Gastroenterology Guidelines: Management of Acute Pancreatitis (Tenner et al., Am J Gastroenterol 2024) (DOI: 10.14309/ajg.0000000000002645).
What are the limitations of the Necrotising Pancreatitis: Timing of Intervention?
Known limitations include: Adults only. Decisions need an HPB team; transfer early if there is no interventional radiology, therapeutic endoscopy or HPB surgery on site.; Timing is individual: aim for about 4 weeks, but bleeding, compartment syndrome, bowel ischaemia or cholangitis need action now.; Does not cover acute pancreatitis without necrosis, or chronic pancreatitis.; Evidence for timing and route of intervention is mostly observational; the step-up and POINTER trials are the main RCTs.. Individual patient factors may require deviation from these recommendations.
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