Abstract
Background: Visceral hypersensitivity is claimed to be involved in the pathogenesis of nonulcer dyspepsia (NUD). In a double-blind crossover study, we evaluated the effects of tropisetron, a 5-HT<sub>3</sub> receptor antagonist, on gastric accommodation, reflex relaxation, and sensitivity in NUD patients. Methods: Eight patients and 10 healthy controls received placebo or 5 mg tropisetron on separate days. On each day, gastric accommodation and relaxation were investigated using a gastric barostat. The perception during gastric distension and relaxation was scored by a verbal perception score. Results: Under both medications, gastric accommodation and postprandial gastric reflex relaxation were not impaired in the NUD patients. The visceral perception was increased in the NUD patients and not substantially influenced by tropisetron. Conclusions: Tropisetron does not influence gastric accommodation, reflex relaxation, or gastric sensitivity in NUD patients and healthy controls.
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