Ondansetron in prophylaxis of postoperative nausea and vomiting in patients undergoing breast surgery: a placebo-controlled double blind study.

The present study was to evaluate the efficacy of ondansetron, 5-HT3 receptor antagonist, versus placebo in the prevention of postoperative nausea and vomiting (PONV) in a homogenous group of female patients undergoing breast reduction surgery under general anaesthesia. Approximately one hour before skin closure, 70 patients were randomly divided into two groups of 35 each. In a double blind manner each group of patients received either intravenous ondansetron (4mg) or a matching placebo. The overall incidences of PONV during first 24-hour were 60% and 20% in placebo and ondansetron group respectively (p<0.05). However, there was no significant difference after 24-hour postoperatively. In placebo group 42.9% of patients received rescue anti-emetic (metoclopramide) for the treatment of severe PONV (ie, 2 or more episodes of PONV), whereas, only 8.6% patients were administered such intervention in the ondansetron group (p<0.05). It is, therefore, concluded that prophylactic administration of intravenous ondansetron (4mg) one hour before skin closure is safe and effective in preventing PONV in female patients undergoing breast surgery and routine use of ondansetron in the patient population is recommended.