Summary

The 2024 ACG guideline updates the management of acute pancreatitis with an evidence-based approach to diagnosis, risk stratification, fluid resuscitation, ERCP, antibiotics, nutrition, and management of necrosis. Major shifts from prior versions include endorsement of moderate (rather than aggressive) lactated Ringer’s resuscitation, near-universal use of rectal indomethacin plus periprocedural fluids for ERCP prophylaxis, early oral low-fat solid feeding in mild disease, no prophylactic antibiotics for sterile necrosis, and delayed minimally invasive step-up necrosectomy for infected necrosis.

Key Recommendations

Diagnose AP when 2 of 3 are present: characteristic abdominal pain, lipase (preferred over amylase) >3× ULN, or characteristic imaging findings.
Do not follow serial amylase/lipase after diagnosis is established—they do not predict severity, prognosis, or readiness to refeed.
Obtain transabdominal ultrasound in all patients with AP to assess for a biliary etiology; repeat in 1 week if initially inconclusive.
Use lactated Ringer’s solution rather than normal saline for resuscitation in AP.
Use moderate (not aggressive) IV hydration: ~1.5 mL/kg/hr in euvolemic patients, with a 10 mL/kg bolus only if hypovolemic; avoid continued aggressive hydration beyond 24 hours.
Reserve urgent ERCP (within 24 hours) for gallstone pancreatitis complicated by cholangitis or progressive cholestasis (bilirubin >3–5 mg/dL), not for predicted severe AP alone.
Give rectal indomethacin 100 mg and periprocedural lactated Ringer’s to all patients undergoing ERCP unless contraindicated; add a prophylactic pancreatic duct stent in selected high-risk patients.
Do not use prophylactic antibiotics in sterile necrosis or predicted severe AP; reserve antibiotics (carbapenems, quinolones, cephalosporins, metronidazole) for proven or strongly suspected infected necrosis.
Avoid urgent necrosectomy—delay intervention for infected necrosis ≥4 weeks until walled-off, using a minimally invasive step-up (percutaneous/endoscopic drainage) approach.
Begin early oral feeding with a low-fat, low-residue soft diet in mild AP as soon as tolerated; do not require pain resolution or normalized enzymes first.
In severe AP requiring tube feeding, use enteral nutrition (nasogastric is acceptable and easier than nasojejunal); avoid TPN.
Perform same-admission cholecystectomy after mild gallstone pancreatitis; offer cholecystectomy after idiopathic AP in surgical candidates to reduce recurrence.

Thresholds & Doses

Diagnostic enzyme cutoff: amylase and/or lipase >3× upper limit of normal
Hypertriglyceridemia as AP etiology: serum TG >1,000 mg/dL
Pancreatic cancer suspicion: idiopathic AP in patient >40 years, especially recurrent
Severe AP organ failure thresholds: SBP <90 mm Hg, PaO2 <60 mm Hg, creatinine >2 mg/dL after rehydration, GI bleed >500 mL/24 hr, or Marshall score ≥2
Pancreatic necrosis definition: nonviable parenchyma >3 cm or >30% of pancreas
Severity predictors: HCT ≥44, BUN ≥20 mg/dL, CRP ≥150 mg/dL, creatinine ≥2 mg/dL
Initial IV hydration rate: 1.5 mL/kg/hr if euvolemic; 10 mL/kg bolus if hypovolemic; ~3–4 L over first 24 hours
Imaging timing: CT or MRI if no improvement after 48–72 hours
Indication for urgent ERCP in gallstone AP: cholangitis or rising bilirubin >3–5 mg/dL
Post-ERCP pancreatitis prophylaxis: rectal indomethacin 100 mg pre- or post-procedure
Periprocedural LR for ERCP: 3 mL/kg/hr during procedure, 20 mL/kg bolus after, then 3 mL/kg/hr × 8 hours
Delay necrosectomy ≥4 weeks (≥30 days) from admission in stable patients with infected necrosis
Heavy alcohol consumption threshold: >50 g/day for >5 years before attributing AP to alcohol
Recheck fasting TG 1 month after discharge when hypertriglyceridemia suspected

Citations

Diagnosis — 2-of-3 criteria (pain, lipase >3× ULN, imaging)
Etiology — gallstones, alcohol, hypertriglyceridemia, IAP workup
Initial Management — early moderately aggressive LR hydration
ERCP in AP — Schepers/APEC trial; urgent ERCP only for cholangitis or progressive cholestasis
Preventing Post-ERCP Pancreatitis — rectal indomethacin, periprocedural LR, pancreatic duct stents
Role of Antibiotics — no prophylaxis in sterile necrosis; carbapenems/quinolones penetrate necrosis
Nutrition — early oral low-fat solid feeding; enteral over parenteral in severe AP
Surgery — same-admission cholecystectomy for mild biliary AP; delay necrosectomy ≥4 weeks, step-up approach