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Background:Postoperative nausea and vomiting (PONV) is a serious concern in patients undergoing laparoscopic cholecystectomy (LC), with an incidence of 46 to 72%. The purpose of this study was to compare the antiemetic efficacy of intravenous (iv) ondansetron 8 mg, ramosetron 0.3 mg, and palonosetron 0.075 mg for prophylaxis of PONV in high-risk patients undergoing LC.Materials and Methods:In this prospective, randomized, double-blinded study, 87 female patients, 18 to 70 years of age (ASA I and II) and undergoing elective LC under general anesthesia were randomly allocated into three equal groups, the ondansetron group (8 mg iv; n=29), the ramosetron group (0.3 mg iv; n=29), and the palonosetron group (0.075 mg iv; n=29), and the treatments were given just after completion of surgery before extubation. The incidence of complete response (patients who had no PONV and needed no other rescue antiemetic medication), nausea, vomiting, retching, and need for rescue antiemetics over 24 hours after surgery were evaluated.Results:The number of complete responders were 19 (65.5%) for ramosetron, 11 (37.9%) for palonosetron, and 10 (34.5%) for ondansetron, representing a significant difference overall (P=0.034) as well as between ramosetron and ondansetron (P=0.035). Comparison between ramosetron and palonosetron also showed a clear trend favoring the former (P=0.065).Conclusion:Ramosetron 0.3 mg iv was more effective than palonosetron 0.075 mg and ondansetron 8 mg in the early postoperative period, but there was no significant difference in the overall incidence of nausea suffered.

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