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Anesth Analg 1999;89:399
© 1999 International Anesthesia Research Society

REGIONAL ANESTHESIA AND PAIN MANAGEMENT

Perioperative Dextromethorphan Reduces Postoperative Pain After Hysterectomy

Duncan J. Henderson, MB, ChB, FRCA, Brian S. Withington, MB, ChB, John A. Wilson, MB, ChB, MRCP, and Lachlan M. M. Morrison, BSc, MB, ChB, FFARCSI

Department of Anaesthesia, St. John’s Hospital, Livingston, Scotland

Address correspondence and reprint requests to Dr. Lachlan M. M. Morrison, Department of Anaesthesia, St. John’s Hospital, Livingston, EH54 6PP, Scotland, UK.

We studied the effect of dextromethorphan, an N-methyl-D-aspartate antagonist, on analgesic consumption and pain scoring after abdominal hysterectomy. In this double-blinded study, 50 patients were randomized into two groups. Group DM was given oral dextromethorphan 40 mg with their premedication, then 40 mg three times per day for the next 2 days. Group P received placebo at identical times. Postoperative analgesic requirements were assessed using a patient-controlled analgesia system and subsequent oral analgesic intake using a set protocol. Pain was assessed at rest and on movement using a visual analog scale 4, 24, 48, and 72 h after the operation. Median pain scores at rest were significantly lower at 48 and 72 h and also for the sum of all resting pain scores. Mean morphine consumption was less in Group DM (1.1 vs 1.5 mg/h; P = 0.054). Usage of oral diclofenac, given every 8 h as needed, did not differ between groups, but consumption of codydramol (paracetamol 500 mg and dihydrocodeine 10 mg) was significantly less in Group DM. We conclude that the use of oral dextromethorphan has an analgesia-sparing effect and some beneficial effects on pain scoring at rest after abdominal hysterectomy.

Implications: Patients given dextromethorphan before and after surgery had a significant reduction in some pain scores at rest, but not on movement. There was a trend to lower morphine requirements in the first 24 h. Over the next 48 h, oral analgesic usage was significantly reduced.




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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 © 1999 by the International Anesthesia Research Society.