[Gastroduodenal kinetic activity. Possible role of the duodenal bulb in controlling gastric emptying]

The aim of the present study was to evaluate the gastro-duodenal motility coordination, both during the interdigestive phase and after antroduodenal volumetric stimulus. It has been proved that it is possible to evoke the peristaltic gastric activity by stretching the gastric walls. Thus, the Authors simulated the mechanical conditions of the meal by inflating air into the antrum. They studied 5 healthy volunteers, whose age averaged 43 +/- 22.85 years. A 120 cm probe provided with two balloons at 7 and 21 cm from the distal end, and with 7 open-tips for manometric recording, was positioned by endoscopic way. The Authors were able to evaluate the Motor Antral Threshold (i.e. minimum air volume able to evoke an antral motor reflex), obtained by means of the antral inflatable balloon. The average values of this threshold showed to be 35 +/- 5 ml of air. While keeping the duodenal balloon inflated, the repetition of volumetric antral stimulus did not show any Motor Antral Threshold. This threshold showed up again with similar volumes in every patient after deflating the duodenal balloon. The results obtained suggest the existence of a negative duodenal-antral feed-back control on gastric emptying.