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Acute Pancreatitis: Management

1. Overview & Epidemiology

• 85-90% of cases are self-limited, resolving within 3-7 days
• Mortality: <1% mild; ~10% moderate; 20-40% severe; >50% critical
• Most admissions are for interstitial pancreatitis (90-95%); necrotizing pancreatitis accounts for 5-10%

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2. Severity Classification (Revised Atlanta Criteria)

• SIRS (≥2 criteria): temp <36 or >38°C; HR >90; RR >20 or PCO₂ <32; WBC >12,000 or <4,000 or >10% bands
• BISAP score (≥3 predicts severity): BUN >25, impaired mental status, SIRS, age >60, pleural effusion
• APACHE II ≥8 at 24 h indicates severe disease
• Hemoconcentration (Hct >44%) and admission BUN >20 mg/dL are poor prognostic markers

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3. Initial Management (First 4-6 Hours)

A. Fluid Resuscitation (Most Important Intervention)

• Lactated Ringer's solution is preferred over normal saline - shown to reduce systemic inflammation (lower CRP) and decrease SIRS
• Historical aggressive strategy: bolus 15-20 mL/kg, then 2-3 mL/kg/h
• Recent evidence (Evans et al., 2024 meta-analysis, PMID 38872377): A recent meta-analysis found aggressive vs. non-aggressive fluid therapy shows no clear outcome benefit from aggressive hydration; a less aggressive strategy (10 mL/kg bolus → 1.5 mL/kg/h) avoids fluid overload without worsening outcomes
• Target: urine output >0.5 mL/kg/h, normalization of HR, MAP, hematocrit, and BUN
• Monitor response every 6-8 hours with BUN and hematocrit every 8-12 h

B. Analgesia

• IV narcotic analgesics for pain control
• Nonopioid strategies preferred for maintenance, especially in pediatric and chronic cases

C. NPO & Oxygen

• Patient made NPO initially to minimize pancreatic stimulation
• Supplemental oxygen as needed; monitor O₂ saturation

D. Monitoring

• Vital signs, CVP, urine output, blood gases (in severe cases)
• Labs: LFTs, renal function, CBC, clotting, serum calcium (hypocalcemia), blood glucose, triglycerides
• Patients not responding to initial resuscitation → ICU/step-down unit

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4. Determine Etiology

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5. Imaging

• CT scan with IV contrast is best performed 3-5 days into hospitalization (not in first 72 h unless clinical deterioration)
• Recent data show CT is overutilized within 72 h, especially in mild disease
• CT indicated if: organ failure, clinical deterioration, signs of sepsis, suspected necrosis/complications, abdominal compartment syndrome
• Revised Atlanta Criteria outline CT terminology for local complications:

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6. Nutritional Support

• Mild pancreatitis: resume oral low-fat solid diet early once hungry with normal bowel function and no nausea/vomiting
• Moderate-Severe pancreatitis: enteral nutrition (EN) preferred over total parenteral nutrition (TPN), started 2-3 days after admission
• Nasogastric (NG) tube feeding is acceptable; jejunal (NJ) feeding offers theoretical gut-barrier advantages but proven superiority is not established
• EN maintains gut barrier integrity, limits bacterial translocation, is cheaper, and has fewer complications than TPN
• "Resting the pancreas" is no longer supported - enteral feeding is the standard of care
• Consider supplemental parenteral nutrition by day 4 if enteral route is not tolerated

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7. Antibiotics

• Prophylactic antibiotics are NOT recommended for severe or necrotizing pancreatitis - they do not improve survival and may promote opportunistic fungal infections
• Empiric antibiotics should be started if clinical decompensation occurs or infected necrosis is suspected
• Specific indications: confirmed cholangitis, concomitant respiratory/urinary tract infection
• Once infection confirmed and organism identified: targeted antibiotics
• Regimens used: IV cefuroxime, imipenem, or ciprofloxacin + metronidazole
• Duration of prophylaxis (if used): should not exceed 14 days

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8. Gallstone-Specific Management

• ERCP within 72 hours is indicated for gallstone pancreatitis with cholangitis or obstructive jaundice
• ERCP is NOT indicated solely for cholestasis or predicted severe disease without cholangitis
• Cholecystectomy: should be performed during the same admission in mild disease; delayed in severe/complicated disease until recovery

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9. Management of Local Complications

Necrosis

• Sterile necrosis: managed conservatively in most cases
• Infected necrosis: empiric antibiotics + drainage/debridement
• Fine-needle aspiration (FNA) of necrosis has fallen out of favor due to risk of contaminating sterile collections
• Nearly two-thirds of infected necrosis patients respond to antibiotics ± drainage without surgery

Step-Up Approach (Current Standard)

1. Percutaneous or endoscopic transgastric/transduodenal drainage (first-line)
2. If failure: minimally invasive debridement (video-assisted retroperitoneal debridement, endoscopic transluminal debridement, percutaneous nephroscopic debridement)
3. Laparotomy reserved for: failed step-up approach, acute abdomen (perforation/ischemia), severe abdominal compartment syndrome

Pseudocysts

• Asymptomatic pseudocysts: observe
• Symptomatic/enlarging pseudocysts: endoscopic cystgastrostomy or percutaneous drainage

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10. Summary Table: Early Management of Severe Acute Pancreatitis

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Recent Evidence Updates

• Fluid therapy (PMID 38872377): 2024 meta-analysis confirms aggressive IV fluid therapy does not improve outcomes vs. non-aggressive strategy; LR preferred
• Pharmacological interventions (PMID 40035297): 2025 systematic review of pharmacological interventions in adults - supports role of antioxidants and omega-3 fatty acids; LMWH also studied
• LMWH (PMID 39256790): 2024 systematic review and meta-analysis suggests low-molecular-weight heparin may reduce severity and complications in acute pancreatitis, though not yet standard of care

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