What are the clinical signs and symptoms of acute pancreatitis, and what is the recommended inpatient assessment, management, and treatment plan?

Acute Pancreatitis: Inpatient Assessment and Management

Diagnose acute pancreatitis when at least 2 of 3 criteria are present: characteristic upper abdominal pain, serum lipase (preferred) or amylase >3 times the upper limit of normal, and/or characteristic findings on contrast-enhanced CT. 1, 2

Clinical Signs and Symptoms

Key presenting features:

• Epigastric or right upper quadrant pain - typically severe, constant, radiating to the back
• Pain may be accompanied by nausea and vomiting
• Abdominal tenderness on examination
• Important caveat: Pain severity does not correlate with disease severity 3

Initial Diagnostic Workup

Laboratory tests to order immediately:

• Serum lipase (preferred over amylase for diagnosis) 4
• Complete blood count
• Comprehensive metabolic panel (renal and liver function)
• Serum triglycerides
• Serum calcium
• Glucose
• Liver function tests 5

Imaging:

• Transabdominal ultrasound - to evaluate for gallstones 5
• Chest imaging - to assess for pleural effusions/complications 5
• Contrast-enhanced CT is NOT required for diagnosis but should be obtained if diagnosis is uncertain or patient fails to improve clinically 1, 4

Severity Stratification (Must Complete Within 48 Hours)

Assess severity immediately using these validated predictors 4:

Within first 24 hours:

• Clinical impression of severity
• Obesity (body mass index)
• APACHE II score
• Presence of SIRS (Systemic Inflammatory Response Syndrome) - highly sensitive for predicting severe disease 6

At 48 hours:

• C-reactive protein >150 mg/L
• Glasgow score ≥3
• Persistent organ failure (organ failure lasting >48 hours defines severe pancreatitis) 4

At 6-10 days:

• Patients with persistent organ failure, signs of sepsis, or clinical deterioration require CT imaging 4

Immediate Management

1. Fluid Resuscitation

Initiate aggressive intravenous hydration immediately - this is most beneficial within the first 12-24 hours 1. Goal-directed fluid resuscitation should be provided to all patients unless cardiovascular or renal comorbidities preclude it.

2. Pain Control

Provide adequate analgesia 6, 5

3. Nutritional Support

Start oral feeding immediately if no nausea/vomiting - do not keep patients NPO unnecessarily 1, 2

If oral feeding not tolerated:

• Use enteral nutrition (nasogastric or nasojejunal) - NOT parenteral nutrition 4, 1
• Nasogastric route is effective in 80% of cases 4
• Enteral nutrition prevents infectious complications 1
• Avoid parenteral nutrition 1

4. Level of Care Determination

All patients with severe acute pancreatitis (persistent organ failure, extensive necrosis) must be managed in ICU or high-dependency unit with full monitoring and systems support 4

Etiology-Specific Management

Biliary Pancreatitis

Urgent ERCP (within 72 hours) is indicated for:

• Predicted or actual severe pancreatitis with suspected/proven gallstone etiology
• Concurrent acute cholangitis
• Jaundice
• Dilated common bile duct 4

Patients with cholangitis require endoscopic sphincterotomy or stent placement immediately 4

Cholecystectomy timing:

• Perform cholecystectomy during the same hospital admission for mild biliary pancreatitis 1, 2
• All patients with biliary pancreatitis require definitive gallstone management during admission or within 2 weeks 4

Antibiotic Prophylaxis

Do NOT routinely use prophylactic antibiotics in severe AP or sterile necrosis 1, 7

If antibiotics are used:

• Maximum duration: 14 days 4
• Consider only in infected necrosis to delay intervention 1
• Important caveat: Evidence is conflicting and there is no consensus on prophylactic antibiotics 4

Management of Necrotizing Pancreatitis

For patients with >30% pancreatic necrosis and persistent symptoms, or smaller necrosis with clinical suspicion of sepsis:

• Perform image-guided fine needle aspiration 4

For infected necrosis:

• Delay intervention for 4 weeks when possible to allow wall formation around necrosis 1
• Patients with infected necrosis require complete debridement 4
• Use minimally invasive approach over open necrosectomy - lower complication rates 6

Asymptomatic necrosis or pseudocysts do not warrant intervention regardless of size or location 1

Referral Criteria

Refer to specialist tertiary center for:

• Extensive necrotizing pancreatitis
• Patients requiring ICU care
• Need for interventional radiology, endoscopic, or surgical procedures 4, 5

Quality Benchmarks

Expected outcomes 4:

• Overall mortality <10%
• Mortality in severe pancreatitis <30%
• Diagnosis established within 48 hours in all patients
• Etiology determined in ≥80% of cases
• Severity stratification completed within 48 hours in all patients

Common Pitfalls to Avoid

1. Do not delay fluid resuscitation - benefit diminishes after 12-24 hours
2. Do not keep patients NPO unnecessarily - early oral feeding is safe in mild pancreatitis
3. Do not use parenteral nutrition when enteral route is tolerated
4. Do not perform routine prophylactic antibiotics
5. Do not rush to intervene in necrotizing pancreatitis - delay allows better outcomes
6. Do not discharge patients with biliary pancreatitis without definitive gallstone management plan