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BACKGROUND:?Disturbance of gastrointestinal function is a common complication in the early phase of acute pancreatitis (AP). Intestinal gas may relfect the function of the gut. Using plain abdominal radiographs, we investigated whether intestinal gas volume is related to AP. METHODS:?Plain abdominal radiographs of 68 patients with AP within 24 hours after admission and 21 normal controls were digitized and transmitted to a computer. The region of intestinal gas was identiifed by an image manipulation software and the gas volume score (GVS) was calculated. The relationships between the GVS values and various clinical factors of AP were analyzed. RESULTS:The GVS in the AP group was 0.084±0.016, in the mild AP (MAP) group 0.070±0.005, and in the severe AP (SAP) group 0.094±0.013; all values were higher than that in the control group (P