Background: 5-HT3 receptor antagonists are effective antiemetics for perioperative use. However, their effects on myometrial contractility remain unknown. We examined whether three different 5-HT3 receptor antagonists could affect the contraction of human myometrium.
Methods: Samples of human myometrium were taken from parturients undergoing elective cesarean delivery. Effects of ondansetron, granisetron and tropisetron (over a range of 1-10(4)ng/mL) on spontaneous contraction (ratios of amplitude, interval, and duration of the contraction) were examined and compared to saline controls (n=6 for each agent).
Results: None of the three 5-HT3 receptor antagonists significantly affected myometrial contraction.
Conclusion: 5-HT3 receptor antagonists do not affect the contraction of myometrial strips isolated from term pregnant women.
Keywords: 5-HT3 receptor antagonists; Myometrium; Term pregnancy.
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