British Journal of Anaesthesia, 2002, Vol. 88, No. 5 659-668
© 2002 The Board of Management and Trustees of the British Journal of Anaesthesia
Clinical Investigations |
Volatile anaesthetics may be the main cause of early but not delayed postoperative vomiting: a randomized controlled trial of factorial design
1Department of Anaesthesiology, Julius-Maximilians-University of Wuerzburg, Josef-Schneider Strasse 2, D-97080 Wuerzburg, Germany and 2Director of Health, 101 Grove Street, Room 308, San Francisco, CA 94102-4593, USA*Corresponding author
Dedicated to the Editor-in-chief.
Background. Despite intensive research, the main causes of postoperative nausea and vomiting (PONV) remain unclear. We sought to quantify the relative importance of operative, anaesthetic and patient-specific risk factors to the development of PONV.
Methods. We conducted a randomized controlled trial of 1180 children and adults at high risk for PONV scheduled for elective surgery. Using a five-way factorial design, we randomly assigned subjects by gender who were undergoing specific operative procedures, to receive various combinations of anaesthetics, opioids, and prophylactic antiemetics.
Results. Of the 1180 patients, 355 (30.1% 95% CI (27.532.7%)) had at least one episode of postoperative vomiting (PV) within 24 h post-anaesthesia. In the early postoperative period (02 h), the leading risk factor for vomiting was the use of volatile anaesthetics, with similar odds ratios (OR (95% CI)) being found for isoflurane (19.8 (7.751.2)), enflurane (16.1 (6.241.8)) and sevoflurane (14.5 (5.637.4)). A doseresponse relationship was present for the use of volatile anaesthetics. In contrast, no dose response existed for propofol anaesthesia. In the delayed postoperative period (224 h), the main predictors were being a child (5.7 (3.010.9)), PONV in the early period (3.4 (2.44.7)) and the use of postoperative opioids (2.5 (1.73.7)). The influence of the antiemetics was considerably smaller and did not interact with anaesthetic or surgical variables.
Conclusion. Volatile anaesthetics were the leading cause of early postoperative vomiting. The pro-emetic effect was larger than other risk factors. In patients at high risk for PONV, it would therefore make better sense to avoid inhalational anaesthesia rather than simply to add an antiemetic, which may still be needed to prevent or treat delayed vomiting.
Br J Anaesth 2002; 88: 65968
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