## Epidemiology of Acute Pancreatitis — Indian Context **Key Point:** Gallstones are the most common cause of acute pancreatitis globally and in India, accounting for 40–50% of cases. Alcohol is the second most common cause (25–35%), with significant regional variation. ### Causes of Acute Pancreatitis — Frequency Distribution | Rank | Cause | Frequency (%) | Notes | |------|-------|---------------|-------| | 1 | **Gallstones** | 40–50 | Most common worldwide; female predominance | | 2 | **Alcohol** | 25–35 | Male predominance; recurrent episodes | | 3 | **Idiopathic** | 10–15 | Diagnosis of exclusion | | 4 | **Post-ERCP** | 3–5 | Iatrogenic; preventable | | 5 | **Hypertriglyceridemia** | 1–3 | Rare; TG >1000 mg/dL | | 6 | **Medications** | 1–2 | Azathioprine, sulfonamides, valproate | | 7 | **Trauma** | <1 | Blunt abdominal trauma | **High-Yield:** When asked for the "most common cause" without a specific clinical context, gallstones is the correct answer. This is a pure epidemiologic question, not a case-based question. ### Geographic Variation **Clinical Pearl:** In India, the relative frequency of gallstone pancreatitis vs. alcohol pancreatitis varies by region: - **Urban centers with higher alcohol consumption:** alcohol may approach 40% - **Overall population:** gallstones remain the leading cause at 45–50% - **Female patients:** gallstones dominate (60–70%) - **Male patients:** alcohol and gallstones are more evenly distributed **Warning:** Do not confuse "most common cause" with "most common in a specific subgroup." The stem asks for the most common cause in a general series of 500 consecutive patients — this is a population-level question, and gallstones is the answer. ### Pathophysiology **Gallstone pancreatitis** occurs via: 1. Transient obstruction of the ampulla of Vater 2. Increased intraductal pressure 3. Reflux of bile into pancreatic ducts 4. Activation of pancreatic zymogens [cite:Park 26e Ch 6]
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