Acute pancreatitis: 31-Year trends in incidence and mortality - A Danish population-based cohort study.

Abstract Background /Objectives: Increasing incidence rates and declining mortality rates have made acute pancreatitis a common cause of hospitalization. We aimed to examine 31-year trends in first-time hospitalization for acute pancreatitis, the subsequent short-term and long-term mortality, and the prognostic impacts of age, sex, and comorbidity. Methods In this nationwide Danish population-based cohort study of 47,711 incident cases, we computed the annual sex-specific age-standardized incidence rates of acute pancreatitis for 1988–2018. Among patients with incident hospitalization for acute pancreatitis, we computed sex-specific 30-day and 31–365-day mortality rates, stratified them, and performed proportional-hazards regression to estimate mortality rate ratios adjusted for sex, age, and comorbidity, measured by Charlson Comorbidity Index categories. Results From 1988 to 2018, the standardized incidence rate of acute pancreatitis per 100,000 person-years increased by 29% for men (28.8–37.0%) and by 148% for women (15.7–38.9%). Among patients with pancreatitis, the 30-day mortality declined from 10.0% in those diagnosed in 1988–1992 to 6.3% for those diagnosed in 2013–2017. The corresponding 31–365 day mortality increased from 5.5% to 6.0%. In comparing periods 1988–1992 and 2013–17, the adjusted 30-day mortality rate ratio was 0.36 (95% confidence interval: 0.32–0.41) and the adjusted 31–365 day mortality rate ratio was 0.64 (95% confidence interval: 0.56–0.74). Comorbidity was a strong predictor of mortality among patients with pancreatitis. Conclusions Over the 31 years of observations, annual rates of acute pancreatitis more than doubled among women, converging with those among men. The comorbidity burden was a strong prognostic factor for short and long-term mortality. Treatments for acute pancreatitis should focus on existing comorbidities.