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Thirty-three intraabdominal complications occurred in 27 patients over a 16-year period in 4,629 patients who underwent cardiopulmonary bypass (0.58% incidence). The mortality was 14.8% for the intraabdominal complication group compared with 3.4% for the control group of patients (p < 0.01). The most common complication was gastrointestinal hemorrhage (n = 20), of which esophagitis (n = 6) was the most common cause. However, patients with duodenal ulcer (n = 4) had the highest mortality; 2 patients who underwent truncal vagotomy and pyloroplasty subsequently died. Two further patients underwent operation for perforated anterior duodenal ulcers without further morbidity. Cholecystitis developed in 5 patients and acute pancreatitis in 4; all were managed nonoperatively with no mortality. Multisystem organ failure developed in 2 patients, of whom 1 died. There was a significant correlation between …