A comparison of prophylactic antiemetic therapy with palonosetron and dexamethasone as single-agents or in combination in adult patients undergoing laparoscopic surgery: A randomized trial.

Background: The incidence of postoperative nausea and vomiting (PONV) is quite high after laparoscopic surgeries. This study endeavors to compare the efficacy of the combination of palonosetron and dexamethasone with that of either drug alone in the prevention of PONV in patients undergoing laparoscopic surgeries.

Methods: This randomized, parallel-group trial was done on ninety adults of American Society of Anesthesiologists Grade I and II patients aged 18-60 years undergoing laparoscopic surgeries under general anesthesia. The patients were randomly divided into three groups of thirty patients each. Group P (n = 30) received palonosetron 0.075 mg intravenously (iv), Group D (n = 30) received dexamethasone 8 mg iv and Group P + D (n = 30) received palonosetron 0.075 mg and dexamethasone 8 mg iv. The primary outcome was incidence of PONV in 24 h, and the secondary outcome was a number of rescue antiemetics required. To compare the proportions in the groups, unpaired t-test, Mann-Whitney U-test, Chi-square test, or Fisher's exact test was applied.

Results: We found that the overall incidence of PONV was 46.7% in Group P, 50% in Group D, and 43.3% in Group P + D during the first 24 h. Rescue antiemetic was required in 27% of the patients in Group P and Group D compared to 23% of the patients in Group P + D and twice in 3% of the patients in Group P, 7% of the patients in Group D, and none in Group P + D which were not significant.

Conclusions: The combination therapy of palonosetron plus dexamethasone did not significantly reduce the incidence of PONV when compared with either drug alone.