Which statement about acute pancreatitis is true?

• A. Tissue damage is caused by leakage of pancreatic enzymes into pancreatic tissue
• B. Bile reflux causes tissue damage
• C. Autoimmune destruction causes tissue damage
• D. Ischemia from shock causes tissue damage

Answer: (A)

In acute pancreatitis, tissue damage mainly comes from the pancreas digesting its own tissue because the digestive enzymes are activated inside the pancreas and leak into the pancreatic tissue. When enzymes like trypsinogen are prematurely activated within acinar cells, they start a cascade that activates other enzymes and digests pancreatic parenchyma, leading to inflammation, edema, fat necrosis, and sometimes hemorrhage. That intrapancreatic enzyme leakage and autodigestion is the core driver of the injury, which is why the statement describing tissue damage as caused by leakage of pancreatic enzymes into pancreatic tissue is the best description.

Bile reflux can contribute to pancreatitis by obstructing or stressing the pancreatic duct in some cases, but it is not the direct mechanism of tissue destruction. Autoimmune destruction and ischemia from shock may be involved in certain clinical scenarios or severities, but they do not explain the primary process of autodigestion within the pancreas itself.