The Bedside Index for Severe Acute Pancreatitis (BISAP) predicts the severity of acute pancreatitis. A score ≥ 3 is correlated with a risk of significant organ failure and high mortality.
Overall, the frequency of acute pancreatitis is increasing in the United States and the rest of the world. It is the leading cause of hospitalizations due to gastrointestinal disorders in the United States. Acute pancreatitis accounts for approximately 275,000 hospital admissions annually. It is difficult to determine whether this trend is related to a real increase in incidence or simply to increased detection. Despite the increase in incidence, mortality has decreased in the United States; the most recent studies cite mortality of around 2%. The peak incidence of acute pancreatitis occurs in the fifth and sixth decades; however, mortality increases with age. In the United States, the incidence of acute pancreatitis in the population is 13 to 45 per 100,000 people per year.
In the majority of cases of acute pancreatitis, alcohol consumption, gallstones, or hypertriglyceridemia are involved. The rate of onset by etiology varies across geographic regions and socioeconomic strata.