A 38-year-old man presents to the emergency department with severe epigastric pain radiating to the back for 6 hours. He reports consuming alcohol heavily the previous night. On examination, temperature is 38.2°C, heart rate 110/min, blood pressure 100/65 mmHg. Abdomen is tender in the epigastrium with guarding. Laboratory investigations show: serum amylase 1200 U/L (normal <100), serum lipase 2400 U/L (normal <60), WBC 14,500/μL, glucose 280 mg/dL, calcium 7.2 mg/dL. Abdominal ultrasound shows pancreatic edema without gallstones. What is the most likely diagnosis and the primary pathogenic mechanism?

Explanation

## Diagnosis: Acute Alcoholic Pancreatitis ### Clinical Presentation This patient presents with the classic triad of acute pancreatitis: - Severe epigastric pain radiating to the back - Elevated pancreatic enzymes (amylase and lipase) - Associated systemic features (fever, tachycardia, hypotension) ### Etiology: Alcohol as the Culprit **Key Point:** Alcohol is the second most common cause of acute pancreatitis worldwide (after gallstones) and accounts for ~30–40% of cases in developed countries. ### Pathogenic Mechanism **High-Yield:** Alcohol causes acute pancreatitis through two primary mechanisms: 1. **Direct toxic injury** — ethanol and its metabolite acetaldehyde directly damage acinar cells and increase intracellular calcium, triggering premature activation of digestive enzymes. 2. **Ductal obstruction** — chronic alcohol use causes precipitation of insoluble proteins within pancreatic ducts, forming proteinaceous plugs that obstruct flow and increase intraductal pressure, leading to acinar rupture and enzyme leakage. ### Supporting Laboratory Findings - **Hypocalcemia (7.2 mg/dL)** — indicates severe pancreatitis; calcium is sequestered in areas of fat necrosis (saponification) - **Hyperglycemia (280 mg/dL)** — reflects pancreatic acinar damage and impaired insulin secretion - **Leukocytosis** — systemic inflammatory response - **Negative ultrasound for gallstones** — rules out biliary etiology ### Clinical Pearl **Warning:** Alcohol-induced pancreatitis typically presents with more severe disease and higher mortality compared to biliary pancreatitis. Recurrent episodes are common if alcohol consumption continues. ### Mnemonic for Acute Pancreatitis Causes **GET SMASHED** — Gallstones, Ethanol, Trauma, Steroids, Mumps, Autoimmune, Scorpion sting, Hypercalcemia/Hypertriglyceridemia, ERCP, Drugs (azathioprine, 6-MP, pentamidine, sulfonamides, thiazides, valproate) ## Severity Assessment **Key Point:** This patient shows signs of severe pancreatitis: - Systemic hypotension (100/65) - Fever and tachycardia - Hypocalcemia - Predicted APACHE II or SOFA score would likely be elevated Management requires ICU monitoring, fluid resuscitation, and consideration of ERCP if biliary obstruction is suspected.