Acute Pancreatitis with Normal Amylase

Diagnostic Confirmation

• The American College of Gastroenterology recommends measuring serum lipase immediately, as it has higher sensitivity (79% vs 72%) and remains elevated for a longer period (8-14 days vs 3-7 days) than amylase 1
• A lipase level >3 times the upper limit of normal confirms the diagnosis, even with normal amylase 1, 2
• Obtain an abdominal ultrasound immediately to detect gallstones, bile duct dilation, or free peritoneal fluid 1, 2

Severity Stratification

• The American College of Gastroenterology recommends evaluating severity using the APACHE II score (cutoff of 8) within the first 24-48 hours 1, 2
• Measure C-reactive protein at 48 hours (>150 mg/L indicates severe disease) 1, 2
• Presence of organ failure or systemic inflammatory response syndrome (SIRS) also indicates severe disease 1

Management According to Severity

• The British Society of Gastroenterology recommends aggressive intravenous hydration within the first 12-24 hours (unless there are cardiovascular or renal contraindications) 3
• Admit patients to the intensive care unit or intermediate care if there is organ failure or SIRS 3

Tomography

• The American College of Radiology recommends performing a contrast-enhanced CT scan after 72 hours of symptom onset in patients with APACHE II >8 or evidence of organ failure 1, 2
• If clinical and biochemical findings are inconclusive despite elevated lipase, proceed with a contrast-enhanced CT scan 2

Etiology Determination

• If gallstones are detected with severe pancreatitis, consider urgent endoscopic retrograde cholangiopancreatography (ERCP) 2
• Measure serum triglycerides and calcium if there are no gallstones or significant alcohol history 1, 2
• Triglycerides >1000 mg/dL (>11.3 mmol/L) indicate hypertriglyceridemia as the etiology 1, 2

Nutritional Support

• The European Society for Clinical Nutrition and Metabolism recommends enteral nutrition (preferably nasogastric) to prevent infectious complications in severe pancreatitis 3

Monitoring and Follow-up

• Use serial clinical examinations instead of enzyme levels to evaluate progression 1, 2
• Monitor resolution of abdominal pain, tolerance to oral intake, and absence of systemic inflammatory signs 1, 2
• Be vigilant for complications 6-10 days after admission, including persistent organ failure or sepsis 1, 2