SummaryWe have compared the efficacy of ondansetron, metoclopramide, droperidol and placebo
Key wordsAnaesthesia; gynaecological, laparoscopy .Vomiting; antiemetics, ondansetron, droperidol, metoclopramide. Nausea and vomiting are frequent postoperative events, the incidence ranging from 30 to 83% and is an important cause of unscheduled hospital stay in day case surgery [l-51. The aetiology of postoperative nausea and vomiting (PONV) is multifactorial and includes age, gender, the day of the menstrual cycle, type of surgery, and the anaesthetic technique [6-81. Ondansetron, a 5-HT, receptor antagonist, is a relatively new antiemetic drug which has been shown to be effective in reducing chemo-and radiotherapy induced sickness [9, lo]. More recent studies have shown that it is effective in the prevention and treatment of PONV when compared to placebo [I 1-13]. However, there are no direct comparative studies with other commonly used and well established antiemetic drugs, such as metaclopramide and droperidol in day stay laparoscopic surgery. The present investigation was carried out to make a direct comparison between ondansetron and these antiemetics in a placebo-controlled study.
Patients and methodsFollowing approval by the local ethics committee and written informed consent, 140 patients undergoing diagnostic laparoscopy or laparoscopic sterilisation were included in the study. Patients were admitted to the Day Procedure Unit following an overnight fast of 8 to 10 h. At the pre-anaesthetic interview the patients were familiarised with a postoperative questionnaire and a scale (0-lOcm) for recording visual analogue scores (VAS). No premedication was administered. Patients were randomly allocated to receive one of the following by intravenous injection: ondansetron 4 mg, droperidol 1 mg, metoclopramide 10 mg, or placebo (0.90/, normal saline). A double-blind design was used and the drugs were administered 3 to 5min before induction of anaesthesia.Anaesthesia was induced with propofol 2-3 mg.kg-' and fentanyl 1-1.5 pg.kg-'. Atracurium 0.2-0.3 mg/kg-'