Management of Acute Pancreatitis

1. Initial Assessment and Severity Classification

• Cardiovascular: SBP <90 mmHg or HR >130 bpm
• Pulmonary: PaO₂ <60 mmHg
• Renal: Serum creatinine >2.0 mg/dL

• Early phase (<2 weeks): severity driven by SIRS and organ failure
• Late phase (>2 weeks): local complications dominate; CT imaging becomes important

Severity Scoring Tools

• B - BUN >25 mg/dL
• I - Impaired mental status (GCS <15)
• S - SIRS (≥2 of 4 criteria)
• A - Age >60 years
• P - Pleural effusion on imaging

• Core temperature <36°C or >38°C
• Heart rate >90 bpm
• Respirations >20/min or PaCO₂ <32 mmHg
• WBC >12,000/µL, <4,000/µL, or >10% bands

2. Hospital Triage

• Mild disease (low BISAP, normal BUN/Hct, no SIRS) → regular ward
• Persistent SIRS at 24 h, comorbidities → step-down/HDU
• Organ failure, respiratory compromise, hypotension → ICU directly

3. Fluid Resuscitation

• Resuscitate with a balanced crystalloid (Lactated Ringer's preferred over normal saline - LR reduced systemic inflammatory response in one trial)
• Goal: restore normal blood pressure, blood volume, and urine output
• Vigorous early resuscitation (5-10 mL/kg/h) has proponents, particularly in the first 24 h
• Monitor response: a falling hematocrit and BUN in the first 12-24 h confirms adequate resuscitation
• A rising BUN during hospitalization = inadequate hydration and higher in-hospital mortality
• Caution in elderly, cardiac disease, and renal disease (risk of over-resuscitation)
• Schwartz's Principles of Surgery, p. 1474; Harrison's Principles, p. 2791

4. Analgesia

• Opioids are acceptable and effective; older fears about sphincter of Oddi spasm with morphine are not clinically significant
• Epidural analgesia may be considered in severe cases
• Multimodal analgesia (NSAIDs, paracetamol) should be used to minimize opioid requirements

5. Nutritional Support

• Enteral nutrition (EN) is the mainstay - parenteral nutrition (PN) is more expensive, riskier, and no more effective
• PN should only be used when EN cannot meet calculated nutritional requirements
• Early EN (within 24 h) is NOT superior to allowing oral diet until 72 h; a reasonable approach is to allow oral intake when tolerated
• If oral diet is not tolerated at 48-72 h, start nasogastric (NG) tube feeding and advance stepwise over 2-3 days
• Advance to nasojejunal (NJ) feeding (by endoscopy or fluoroscopy) if NG feeding is not tolerated
• Standard polymeric formulas are equivalent to elemental or immune-enhancing formulas - use standard formula
• In mild pancreatitis: allow patient-controlled nutrition (ad libitum) - safe and effective
• Aggressive early EN before adequate resuscitation risks non-occlusive mesenteric ischemia
• Schwartz's Principles of Surgery, p. 1474; Bailey & Love's, p. 7987

6. Antibiotics

• Prophylactic antibiotics are NOT recommended for severe acute pancreatitis (Harrison's 22e, 2025 - current consensus)
• Antibiotics should be given only when there is evidence of infection: cholangitis, infected necrosis, concomitant respiratory or urinary tract infection, or proven bacteremia
• If given for prophylaxis in necrosis (some controversy remains per Bailey & Love's), regimens include:
  • IV cefuroxime, OR
  • Imipenem, OR
  • Ciprofloxacin + metronidazole
  • Duration should not exceed 14 days
• Additional antibiotic use should always be guided by microbiological cultures

7. Imaging

• NOT needed or recommended in the first 48-72 h for mild disease (recent data shows overutilization)
• CT with IV contrast is best evaluated 3-5 days into hospitalization if patients are not responding to supportive care
• Obtain CT when: organ failure, clinical deterioration, or signs of sepsis develop
• CT identifies two types:
  • Interstitial pancreatitis (90-95%): diffuse gland enlargement, homogenous enhancement
  • Necrotizing pancreatitis (<10%): non-enhancing areas of the gland

• Detecting solid content within collections
• Differentiating necrotic pancreas from fluid within collections

8. Local Complications and Their Management

• Management depends on: clinical symptoms, evidence of infection, maturity of collection, clinical stability
• Asymptomatic sterile collections: conservative management (most resolve spontaneously)
• Infected necrosis: requires intervention - step-up approach preferred:
  1. Percutaneous drainage (CT-guided) as first step
  2. Endoscopic drainage/debridement (EUS-guided cystogastrostomy or lumen-apposing metal stents)
  3. Video-assisted retroperitoneal debridement (VARD) or surgical necrosectomy reserved for failures
• Early open surgical debridement has been replaced by minimally invasive step-up approach (reduces organ failure and complications)

• Delay intervention as long as possible to allow collection to "wall off" (ideally >4 weeks)
• Intervention before 4 weeks is associated with significantly higher morbidity and mortality

9. Etiology-Specific Management

Gallstone Pancreatitis

• ERCP within 24-48 h for concurrent ascending cholangitis (sepsis + biliary obstruction)
• Early ERCP (within 24-48 h) reduces complications in predicted severe gallstone pancreatitis, though not mortality - but confers no benefit in absence of cholangitis (common duct stone usually passes spontaneously)
• Cholecystectomy: should be performed during the same admission in mild gallstone pancreatitis to prevent recurrence (or endoscopic sphincterotomy for non-surgical candidates)
• In severe pancreatitis: defer cholecystectomy until full recovery

Hypertriglyceridemia-Induced Pancreatitis (TG >1000 mg/dL)

• IV insulin infusion to correct hyperglycemia (also rapidly lowers triglycerides)
• Patient should remain fasting for 24-36 h (unlike standard AP management)
• Adjuncts: heparin or plasmapheresis (limited evidence)
• Long-term: lipid-lowering agents, glycemic control, avoid offending drugs

Drug-Induced Pancreatitis

• Discontinue the causative drug immediately
• ~30 drugs have been definitively confirmed (Class 1A evidence) as causative on rechallenge

Hypercalcemia-Induced

• Treat underlying cause (hyperparathyroidism, malignancy)

Post-ERCP Pancreatitis (Prevention)

• Pancreatic duct stenting and/or rectal indomethacin are both effective in reducing risk

10. Supportive Care for Severe Pancreatitis

• Admission to HDU/ICU
• Aggressive fluid rehydration
• Supplemental oxygen (target SpO₂ >95%)
• Invasive monitoring: vital signs, CVP, urine output, blood gases
• Frequent monitoring: CBC, LFTs, RFTs, coagulation, serum calcium, blood glucose
• Nasogastric tube (initially, for vomiting/ileus)
• Organ failure support: inotropes, ventilatory support, hemofiltration/dialysis as needed

11. Oral Feeding Resumption

• Mild pancreatitis: resume oral intake when patient is hungry, has normal bowel function, and is free from nausea/vomiting
• A low-fat solid diet is advised early in mild pancreatitis (not just clear liquids)
• Oral intake can be attempted within 3-5 days in mild disease; if not tolerated, start tube feeding

12. Follow-Up and Recurrence Prevention

• Identify and treat the underlying etiology (gallstones, alcohol, hypertriglyceridemia, medications)
• Patients with alcohol-related pancreatitis: counseling, cessation programs
• Smoking is an independent risk factor and should be addressed
• First attack of gallstone pancreatitis: plan definitive biliary intervention before discharge when possible

• Harrison's Principles of Internal Medicine, 22nd Edition (2025), Chapter 359, pp. 2789-2793
• Schwartz's Principles of Surgery, 11th Edition, Chapter 33, pp. 1471-1478
• Bailey & Love's Short Practice of Surgery, 28th Edition, Chapter 72, p. 7953-8001