British Journal of Anaesthesia, Vol 78, Issue 3 256-259, Copyright © 1997 by The Board of Management and Trustees of the British Journal of Anaesthesia
M. Tramer, A. Moore and H. McQuay
Data from two published and one new meta-analysis were reviewed to compare
the antiemetic efficacy of three different anaesthetic regimens: (i)
propofol anaesthesia compared with another anaesthetic (control); (ii)
anaesthesia without nitrous oxide compared with the same anaesthetic with
nitrous oxide (control); (iii) propofol anaesthesia without nitrous oxide
(TIVA) compared with another anaesthetic with nitrous oxide (control).
Efficacy (prevention of postoperative nausea and vomiting compared with
control) was estimated using odds ratio and number-needed-to-treat methods,
and compared within a range of 20-60% control event rates for early
efficacy (0-6 h) and 40-80% for late efficacy (0-48 h). Propofol
anaesthesia or omitting nitrous oxide had similar effects on vomiting, both
early and late. Propofol (but not omitting nitrous oxide) decreased the
incidence of nausea. TIVA studies were documented poorly; appropriate
comparison with other interventions were not possible. Efficacy of
treatments should be compared within a setting-specific range of control
event rates. There is insufficient evidence that TIVA with propofol is an
anaesthetic technique with a low emetogenic potency.
CLINICAL INVESTIGATIONS
Meta-analytic comparison of prophylactic antiemetic efficacy for postoperative nausea and vomiting: propofol anaesthesia vs omitting nitrous oxide vs total i.v. anaesthesia with propofol
Pain Research, Nuffield Department of Anaesthetics, The Churchill, Oxford Radcliffe Hospital, Headington, Oxford OX3 7LJ
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