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Medline (1966 to November 2004), EMBASE/Excerpta Medica (1994 to February 2004), Cochrane Central Register of Controlled trials (Cochrane Library, Issue 3, 2004), and reference lists of retrieved studies.
Study selection and assessment:
randomised controlled trials (RCTs) that compared the efficacy of PCA (intermittent IV doses of morphine or other mu opioid agonists self administered by patients using PCA pumps) with conventionally administered opioids (intramuscular, IV, subcutaneous, or oral) for postoperative …
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