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[Comparative study on the inhibitory effect of glucagon and secretin on the gastroduodenal motility in man].

Manometric study was performed to compare the inhibitory effect of glucagon and secretin on the gastroduodenal motor activity by infused catheter method. The subjects consisted of 3 healthy volunteers and 7 patients with peptic ulcer and other diseases. The following results were obtained. After the intravenous administration of glucagon (1 mg), the motor activity of the stomach and duodenum was inhibited promptly. According to statistic evaluation, the contraction numbers and motility index decreased significantly during 25 minutes compared with the basal values in both stomach and duodenum. After the administration of secretin (100 units), gastric motor activity was markedly inhibited, although duodenal motility increased during 10 minutes due to the initiation of secretin-induced migrating motor complex. The contraction numbers and motility index in stomach decreased significantly during 20 minutes after the administration. The inhibitory effect of glucagon was more remarkable in duodenum than in stomach. On the other hand, secretin was more effective in stomach than in duodenum.