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Anesth Analg 2005;101:1516-1520
© 2005 International Anesthesia Research Society
doi: 10.1213/01.ANE.0000181338.35454.6A

REGIONAL ANESTHESIA

Prophylactic Intravenous Ondansetron and Dolasetron in Intrathecal Morphine-Induced Pruritus: A Randomized, Double-Blinded, Placebo-Controlled Study

Christos A. Iatrou, MD, PhD, Christos K. Dragoumanis, MD, Theodosia D. Vogiatzaki, MD, PhD, George I. Vretzakis, MD, PhD, Constantinos E. Simopoulos, MD, PhD, and Vasilios K. Dimitriou, MD, PhD

Departments of Anesthesia and Surgery, Democritus University of Thrace, Alexandroupolis, Greece, and the Department of Anesthesia, "G. Gennimatas" Hospital, Athens, Greece

Address correspondence and reprint requests to Christos Dragoumanis MD, University Hospital of Alexandroupolis, Level 2, Room: 54.10, Dragana, Alexandroupolis 68100, Greece. Address e-mail to christosdr{at}panafonet.gr.

Pruritus is the most common side effect of intrathecal morphine for postoperative pain relief. Activation of central 5-hydroxytryptamine subtype 3 (5-HT3) receptors is one of its possible mechanisms. The role of 5-HT3 antagonists in the prevention of pruritus has not been clearly established. In a prospective, randomized, double-blind, placebo-controlled study, we evaluated the efficacy of prophylactic administration of ondansetron and dolasetron for the prevention of intrathecal morphine-induced pruritus. The patients were randomized into 3 groups to receive either 4 mg ondansetron IV (group O, n = 35), 12.5 mg dolasetron IV (group D, n = 35) or 5 mL placebo (group P, n = 35) 30 min before administration of spinal anesthesia with 10 to 17.5 mg of 0.5% hyperbaric bupivacaine and 0.25 mg of morphine for urologic, orthopedic, or vascular surgery. Patients were evaluated for incidence and severity of pruritus at arrival to the postanesthesia care unit and at 2, 4, 8, and 24 h postoperatively. The incidence and severity of pruritus was significantly less frequent in the ondansetron and dolasetron groups compared with placebo (34%, 20%, and 66% respectively, P < 0.01). Patients who received 5-HT3 antagonist reported significantly less total severity of pruritus compared with placebo during the first 8 h and the severe pruritus was observed only in patients within P group (P group: 4 of 35; 11%, O or D group: 0 of 35; 0%, P < 0.05). We conclude that the prophylactic use of ondansetron and dolasetron helps to reduce the incidence and severity of intrathecal morphine-induced pruritus.




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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 2005 by the International Anesthesia Research Society.