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*Department of Anesthesiology, The Childrens Hospital of Philadelphia, Pennsylvania;
Department of Anesthesiology, The Joe DiMaggio Childrens Hospital, Hollywood, Florida;
Departments of Anesthesiology, Critical Care Medicine, and Pediatrics, The Johns Hopkins Medical Institutions; and
Department of Biostatistics, The Johns Hopkins University School of Public Health, Baltimore, Maryland
Address correspondence to Myron Yaster, MD, Richard J. Traystman Professor, Blalock 935, The Johns Hopkins Hospital, 600 North Wolfe St., Baltimore, MD 21287. Address e-mail to myaster{at}jhmi.edu.
Opioids are frequently associated with side effects such as nausea, vomiting, and pruritus. We hypothesized that a prophylactic, continuous small-dose naloxone infusion would reduce the incidence of opioid-induced side effects without affecting analgesia or opioid consumption. In this prospective, double-blind, randomized, controlled clinical trial, we studied 46 postoperative patients (M:F, 21:25), averaging 14 ± 2.5 yr and 53 ± 17 kg, at the start of morphine IV patient-controlled analgesia. Patients were randomized to either saline (control, n = 26) or naloxone 0.25 µg · kg1 · h1 (n = 20). We found that the incidence and severity of pruritus (77% versus 20%; P < 0.05) and nausea (70% versus 35%; P < 0.05) was significantly more frequent in the placebo group compared with the naloxone group. Morphine consump-tion (1.02 ± 0.41 mg · kg1 · d1 versus 1.28 ± 0.61 mg · kg1 · d1), pain scores at rest (4 ± 2 versus 3 ± 2), and pain scores with coughing (6 ± 2 versus 6 ± 2) were not different. We conclude that, in children and adolescents, a small-dose naloxone infusion (0.25 µg · kg1 · h1) can significantly reduce the incidence and severity of opioid-induced side effects without affecting opioid-induced analgesia. When initiating morphine IV patient-controlled analgesia for the treatment of moderate to severe pain, clinicians should strongly consider starting a concomitant small-dose naloxone infusion.
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