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Drugs for preventing postoperative nausea and vomitingCarlisle J, Stevenson CA
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SummaryDrugs for preventing nausea and vomiting after surgeryWe found eight drugs that reliably prevented nausea or vomiting after surgery. The drugs prevented nausea or vomiting in three or four people out of every 10 who would have vomited or felt nauseated with a placebo. We did not find reliable evidence that one drug was better than another. A person's age or sex, the type of surgery, or the time the drug was given did not change the effect of a drug. When drugs were given together, their effects simply added. Side effects were mild and affected four out of 100 people for the two drugs most studied. Either nausea or vomiting are reported to affect, at most, 80 out of 100 people after surgery. If all 100 of these people are given a drug, about 28 would benefit and 72 would not. Nausea or vomiting are usually less common and therefore drugs are usually less useful. Doctors should research how often drugs cause severe side effects.
This is a Cochrane review abstract and plain language summary, prepared and maintained by The Cochrane Collaboration, currently published in The Cochrane Database of Systematic Reviews 2009 Issue 4, Copyright © 2009 The Cochrane Collaboration. Published by John Wiley and Sons, Ltd.. The full text of the review is available in The Cochrane Library (ISSN 1464-780X).
This version first published online:
July 19. 2006 AbstractBackgroundDrugs can prevent postoperative nausea and vomiting, but their relative efficacies and side effects have not been compared within one systematic review. ObjectivesThe objective of this review was to assess the prevention of postoperative nausea and vomiting by drugs and the development of any side effects. Search strategyWe searched The Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library, Issue 2, 2004), MEDLINE (January 1966 to May 2004), EMBASE (January 1985 to May 2004), CINAHL (1982 to May 2004), AMED (1985 to May 2004), SIGLE (to May 2004), ISI WOS (to May 2004), LILAC (to May 2004) and INGENTA bibliographies. Selection criteriaWe included randomized controlled trials that compared a drug with placebo or another drug, or compared doses or timing of administration, that reported postoperative nausea or vomiting as an outcome. Data collection and analysisTwo authors independently assessed trial quality and extracted outcome data. Main resultsWe included 737 studies involving 103,237 people. Compared to placebo, eight drugs prevented postoperative nausea and vomiting: droperidol, metoclopramide, ondansetron, tropisetron, dolasetron, dexamethasone, cyclizine and granisetron. Publication bias makes evidence for differences among these drugs unreliable. The relative risks (RR) versus placebo varied between 0.60 and 0.80, depending upon the drug and outcome. Evidence for side effects was sparse: droperidol was sedative (RR 1.32) and headache was more common after ondansetron (RR 1.16). Authors' conclusionsEither nausea or vomiting is reported to affect, at most, 80 out of 100 people after surgery. If all 100 of these people are given one of the listed drugs, about 28 would benefit and 72 would not. Nausea and vomiting are usually less common and, therefore, drugs are less useful. For 100 people, of whom 30 would vomit or feel sick after surgery if given placebo, 10 people would benefit from a drug and 90 would not. Between one to five patients out of every 100 people may experience a mild side effect, such as sedation or headache, when given an antiemetic drug. Collaborative research should focus on determining whether antiemetic drugs cause more severe, probably rare, side effects. Further comparison of the antiemetic effect of one drug versus another is not a research priority. |