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Abstract Background Laparoscopic surgery is associated with a remarkably high risk of post-operative nausea and vomiting. The reasons for this high rate of PONV include mechanical factors (such as pressure on the stomach and gut caused by the pneumoperitoneum), neural factors (such as vagal reflexes elicited by irritation of parasympathetic nerve endings in the abdomen), and chemical factors (which include speculative considerations regarding a possible influence of CO2 on PONV). Objective To compare the effect of midazolam, ondansetron or dexamethasone on prophylaxis against PONV in patients undergoing laparoscopic abdominal surgeries. Patients and Methods After approval of anesthesiology department, scientific and ethical committees in Ain Shams University Hospitals, patients were included in the study, and were divided into three groups (n = 40; each); group M (midazolam group) and Group O (ondansetron group) and group D (dexamethasone group). Results The three groups were adequately monitored and assessed post-operatively and they were compared regarding post-operative nausea and vomiting outcome by recording the incidence of nausea and vomiting and recording the call for rescue antiemetic. Demographic data, intra-operative hemodynamics and post-operative pain score, occurrence of side effects, sedation score and patient satisfaction scores were also assessed, we found about 95% of (M) group achieve the complete response, that mean midazolam provided PONV prophylaxis comparable to dexamethasone and ondansetron in patients who underwent laparoscopic abdominal surgeries. Conclusion From this study, we can conclude that the midazolam is as effective as ondansetron and dexamethasone in reducing the incidence of nausea and vomiting in post-operative period of laparoscopic abdominal surgeries.
El-Taher et al. (Sat,) studied this question.