A 52-year-old man from Delhi presents with acute onset epigastric pain radiating to the back, accompanied by nausea and vomiting for 6 hours. He reports a 10-year history of alcohol consumption (40 units/week). On examination, he is febrile (38.2°C) and has epigastric tenderness. Serum amylase is 850 U/L (normal <100), lipase 920 U/L, and ALT 45 U/L. Abdominal ultrasound shows a normal gallbladder with no stones. Which of the following mechanisms best explains the elevated pancreatic enzyme levels in this patient?

Explanation

## Pathophysiology of Acute Pancreatitis in Alcohol Use **Key Point:** Alcohol-induced acute pancreatitis occurs through direct toxic injury to pancreatic acinar cells, compromising their structural integrity and allowing intracellular enzymes (amylase, lipase) to leak into the interstitium and subsequently into the bloodstream. ### Mechanism of Enzyme Elevation In acute pancreatitis, the elevated serum amylase and lipase reflect: 1. **Acinar cell membrane disruption** — alcohol metabolites (acetaldehyde) and free radicals cause direct cytotoxic injury 2. **Loss of cellular barrier function** — damaged cell membranes become permeable 3. **Passive diffusion of enzymes** — amylase and lipase leak from the intracellular compartment into interstitial fluid and lymphatics, then into blood 4. **Increased vascular permeability** — inflammatory mediators (TNF-α, IL-6) enhance transudation into circulation ### Why This Is the Correct Answer **High-Yield:** The hallmark of acute pancreatitis is **increased cell permeability**, not obstruction or decreased synthesis. The amylase and lipase are *already made* — they escape because the cell membrane is damaged. **Clinical Pearl:** Serum lipase is more specific than amylase for pancreatic injury because amylase is also produced by salivary glands; lipase is pancreatic-dominant. ### Alcohol-Specific Pathogenesis Alcohol causes pancreatitis via: - Direct acinar toxicity (acetaldehyde) - Oxidative stress (increased ROS) - Impaired antioxidant defenses (glutathione depletion) - Increased intracellular calcium → premature zymogen activation - Sensitization to secondary triggers (bile reflux, duct obstruction by protein plugs) [cite:Harrison 21e Ch 329]