Background & aims: The combination of duodenal lipid and gastric distention induces meal-like fullness followed by nausea in healthy subjects. The aim of this study was to assess the role of cholecystokinin (CCK) A receptors in these changes using a CCK-A antagonist loxiglumide.
Methods: Twelve healthy subjects were studied on four occasions, during which either 0.9% saline or 20% Intralipid was infused intraduodenally on two occasions each (1 mL/min) while the proximal stomach was distended with air (100 mL/min). During each duodenal infusion, subjects received intravenous loxiglumide (10 mg.kg-1.h-1) on 1 day and placebo on the other. Intragastric pressure changes were recorded, and the subjects reported gastric sensations (fullness, nausea).
Results: Loxiglumide did not influence gastric motility or sensitivity during duodenal saline infusion. Duodenal lipid reduced gastric tonic and phasic pressure activity during distensions and induced meal-like fullness and nausea; sensations were reported at similar volumes but lower intragastric pressures (P < 0.001 vs. saline). Loxiglumide partially restored gastric tonic and phasic activity during lipid infusion, reduced the occurrence of meal-like fullness and nausea, and increased the pressures at which sensations were reported (P < 0.001 vs. placebo).
Conclusions: CCK-A receptors are involved in the induction of meal-like fullness and nausea associated with intraduodenal lipid and gastric distention.