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Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
We
examined the relationships between gastric volume and duodenal glucose
load in the regulation of gastric emptying in adult male rhesus
monkeys. Intragastric glucose loads (0.125 g/ml) of volumes ranging
from 150 to 375 ml empty from the stomach at the same rate from 20 to
120 min. However, to achieve these equivalent emptying rates,
progressively larger volumes were emptied in the initial 20 min with
increasing gastric volume. Duodenal glucose infusions dose dependently
inhibited the 10-min emptying of various volumes of intragastric
saline. Although increasing gastric volume resulted in increased
emptying, duodenal glucose right-shifted the relationship between
initial gastric volume and volume emptied. These data demonstrate that
liquid nutrient gastric emptying represents an interaction between
gastric volume and nutrient-induced duodenal feedback. For controlled
duodenal caloric delivery rates to be established, sufficient nutrient
emptying must occur to increase the magnitude of duodenal feedback to
withhold a given gastric volume.
rhesus monkeys; duodenal feedback; stomach; glucose
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