Acute pancreatitis

Acute pancreatitis
Other names	Acute pancreatic necrosis[1]
Still from 3D medical animation of acute pancreatitis
Specialty	Gastroenterology, general surgery

Acute pancreatitis (AP) is a sudden inflammation of the pancreas. Causes include a gallstone impacted in the common bile duct or the pancreatic duct, heavy alcohol use, systemic disease, trauma, elevated calcium levels, hypertriglyceridemia (with triglycerides usually being very elevated, over 1000 mg/dL), certain medications, hereditary causes and, in children, mumps. Acute pancreatitis may be a single event, it may be recurrent, or it may progress to chronic pancreatitis and/or pancreatic failure (the term pancreatic dysfunction includes cases of acute or chronic pancreatitis where the pancreas is measurably damaged, even if it has not failed).

In all cases of acute pancreatitis, early intravenous fluid hydration and early enteral (nutrition delivered to the gut, either by mouth or via a feeding tube) feeding are associated with lower mortality and complications.^[2] Mild cases are usually successfully treated with conservative measures such as hospitalization with intravenous fluid infusion, pain control, and early enteral feeding. If a person is not able to tolerate feeding by mouth, feeding via nasogastric or nasojejunal tubes are frequently used which provide nutrition directly to the stomach or intestines respectively.^[2] Severe cases often require admission to an intensive care unit. Severe pancreatitis, which by definition includes organ damage other than the pancreas, is associated with a mortality rate of 20%.^[2] The condition is characterized by the pancreas secreting active enzymes such as trypsin, chymotrypsin and carboxypeptidase, instead of their inactive forms, leading to auto-digestion of the pancreas. Calcium helps to convert trypsinogen to the active trypsin, thus elevated calcium (of any cause) is a potential cause of pancreatitis.^[2] Damage to the pancreatic ducts can occur as a result of this. Long term complications include type 3c diabetes (pancreatogenic diabetes), in which the pancreas is unable to secrete enough insulin due to structural damage.^[2] 35% develop exocrine pancreatic insufficiency in which the pancreas is unable to secrete digestive enzymes due to structural damage, leading to malabsorption.^[2]