Management of Acute Pancreatitis

• Harrison's Principles of Internal Medicine, 22nd ed., p. 2791
• Schwartz's Principles of Surgery, 11th ed., p. 1471

1. Severity Classification

Revised Atlanta Classification (RAC)

Severity Scoring Systems

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

• Core temp <36°C or >38°C
• Heart rate >90 bpm
• Respirations >20/min or PCO2 <32 mmHg
• WBC >12,000/µL, <4,000/µL, or >10% bands

2. Initial Assessment and Monitoring

• Invasive monitoring of vital signs, CVP, urine output, blood gases
• Frequent labs: LFTs, renal function, clotting, serum calcium, blood glucose, hematocrit, BUN every 8-12 h
• CECT abdomen if organ failure, clinical deterioration, or signs of sepsis develop

3. Fluid Resuscitation

• Preferred fluid: Lactated Ringer's (LR) - shown to lower CRP and reduce systemic inflammation vs. normal saline
• Regimen: Initial bolus ~10-15 mL/kg, then 1.5-2 mL/kg/h
• A recent RCT showed aggressive resuscitation (15-20 mL/kg bolus + 2-3 mL/kg/h) increased fluid overload risk without improving outcomes vs. the less aggressive strategy
• Re-assess every 6-8 h; measure hematocrit + BUN every 8-12 h to guide adequacy
• Caution in elderly and those with cardiac/renal disease - over-resuscitation risk is higher

4. Analgesia

• IV narcotic analgesics (opioids) are the standard for pain control
• There is no evidence that morphine worsens AP (the old concern about sphincter of Oddi spasm has not been proven clinically significant)
• Adequate analgesia is a key pillar of early management

5. Nutritional Support

• Enteral nutrition (EN) is the preferred route - oral/nasogastric or nasojejunal feeding
• EN maintains gut mucosal integrity, prevents bacterial translocation, and reduces infectious complications
• Nasogastric (NG) feeding is equally effective as nasojejunal (NJ) and much easier to place
• Parenteral nutrition (PN) is reserved for cases where EN is not tolerated or not possible
• For mild AP, refeeding orally can begin once nausea/vomiting and pain have subsided (often within 24-72 h)
• For severe AP requiring nutritional support, EN should be started within 24-48 h of admission

6. Antibiotics

• Proven or suspected infected pancreatic necrosis (fine-needle aspiration guided by CT, or clinical signs of infection - fever, rising WBC, deterioration at 2-4 weeks)
• Cholangitis - treat promptly
• Concurrent infections - urinary tract infection, pneumonia, line infection

• IV imipenem-cilastatin (penetrates pancreatic tissue well)
• Ciprofloxacin + metronidazole
• Cefuroxime (IV)
• Duration: guided by cultures; prophylactic use should not exceed 14 days

7. Managing the Etiology

Gallstone Pancreatitis

• ERCP within 72 hours is indicated for severe gallstone pancreatitis or when cholangitis or biliary obstruction is present
• Cholecystectomy should be performed during the same admission for mild gallstone pancreatitis (prevents recurrence)
• For severe/necrotizing gallstone pancreatitis, timing of cholecystectomy must be individualized (usually deferred until resolution of acute inflammation)

Hypertriglyceridemia

• Aggressively lower triglycerides; insulin infusion and/or plasmapheresis may be needed

Alcohol-related AP

• Treat withdrawal prophylactically; counsel regarding cessation

8. Local Complications

Classification of Fluid Collections

Management of Necrotizing Pancreatitis

• Sterile necrosis: conservative management; most resolves without intervention
• Infected necrosis (peaks at 3-4 weeks): step-up approach
  1. Percutaneous or endoscopic drainage first
  2. If drainage fails: minimally invasive necrosectomy (video-assisted retroperitoneal debridement - VARD, or endoscopic transluminal necrosectomy)
  3. Open necrosectomy reserved for failure of minimally invasive approaches
• Necrotizing AP carries >50% median rate of organ failure; mortality rises to ~50% with multi-organ failure

Pseudocyst

• Most resolve spontaneously
• Drainage indicated if: symptomatic, enlarging, infected, causing biliary/gastric obstruction
• Preferred: endoscopic transgastric or transduodenal drainage (EUS-guided)

Pancreatic Duct Disruption

• Presents as pancreatic ascites (high amylase in ascitic fluid) or enlarging fluid collection
• Confirmed by MRCP or ERCP
• Bridging pancreatic stent placement >90% effective; non-bridging stents less effective (25-50%)

9. Systemic Complications and Organ Support

10. Summary: Early Management of Severe AP (Bailey & Love, Table 72.4)

1. Admit to HDU/ICU
2. IV analgesics
3. Aggressive fluid resuscitation with LR
4. Supplemental oxygen
5. Invasive monitoring (vital signs, CVP, urine output, blood gases)
6. Frequent lab monitoring (LFTs, renal, clotting, Ca2+, glucose)
7. Nasogastric tube only if vomiting
8. Antibiotics if cholangitis or proven infection
9. CECT if organ failure, deterioration, or sepsis signs
10. ERCP within 72 h for severe gallstone pancreatitis or cholangitis
11. Enteral (nasogastric) nutrition when nutritional support required
12. Organ-specific supportive therapy (inotropes, ventilation, hemofiltration)

11. Follow-Up and Discharge Planning

• Screen for diabetes mellitus (endocrine insufficiency)
• Screen for exocrine pancreatic insufficiency (steatorrhea, weight loss)
• Assess for recurrent cholangitis or infected fluid collections
• Identify and address the underlying etiology to prevent recurrence (25% of patients experience at least one recurrence)
• Alcohol cessation counseling for alcohol-related AP
• Interval cholecystectomy for gallstone-related AP if not done during admission

• Harrison's Principles of Internal Medicine, 22nd ed. (2025) - Chapter 359, pp. 2790-2793
• Schwartz's Principles of Surgery, 11th ed. - Chapter 33, pp. 1471-1472
• Bailey and Love's Short Practice of Surgery, 28th ed. - Table 72.4
• iLATAM-AP 2026 Guidelines - Ibero-Latin American Acute Pancreatitis Guidelines (PMID 42216617, June 2026)