Pancreatic head resection with and without preservation of the duodenum: Different postoperative gastric motility

Background. Early gastric statis is a unique complication of pylorus-preserving pancreatoduodenectomy. Because the duodenum proved to be important in the initiation and consolidation of phase III activity of the migrating motor complex of the stomach, the absence of the duodenum and hence gastric phase III may be a cause of gastric stasis. Methods. Postoperative gastrointestinal motility was measured with a pneumohydraulic capillary infusion system in nine patients who had undergone pylorus-preserving pancreatoduodenectomy through an indwelling tube assembly placed at operation, and compared with that in six patients who had undergone duodenum-preserving pancreatic head resection. Plasma motilin concentrations were measured by radioimmunoassay. Results. The mean period until the first occurrence of gastric phase III was significantly longer in patients who had undergone a pylorus-preserving pancreatoduodenectomy (40.6+/-4.6 days or more) than in patients who had undergone a duodenum-preserving pancreatic head resection (18.8+/-4.3 days; p<0.05). On the day of the first observation of gastric phase III, the plasma concentration of motilin at proximal jejunal phase III in patients who underwent a pylorus-preserving pancreatoduodenectomy (50.2+/-9.8 pg/ml) was significantly lower than that at duodenal phase III in patients who underwent a duodenum-preserving pancreatic head resection (184.6+/-48.6 pg/ml; p<0.05). Conclusions. Gastric stasis after a pylorus-preserving pancreatoduodenectomy may be in part attributable to the low concentration of plasma motilin caused by the resection of the duodenum.