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British Journal of Anaesthesia, Vol 78, Issue 3 311-313, Copyright © 1997 by The Board of Management and Trustees of the British Journal of Anaesthesia

SHORT COMMUNICATIONS

Does intrathecal fentanyl produce acute cross-tolerance to i.v. morphine?

D. W. Cooper, S. L. Lindsay, D. M. Ryall, M. S. Kokri, S. S. Eldabe and G. A. Lear
Department of Anaesthetics, South Cleveland Hospital, Middlesbrough, Cleveland TS4 3BW

We have examined the hypothesis that intrathecal fentanyl at operation can increase postoperative i.v. morphine requirements. We studied 60 patients undergoing Caesarean section. All received intrathecal 0.5% plain bupivacaine 2 ml combined with either fentanyl 0.5 ml (25 micrograms) (group F) (n = 30) or normal saline 0.5 ml (group S) (n = 30). In addition, 10 ml of an extradural solution (fentanyl 1 ml (50 micrograms) combined with 0.5% bupivacaine 9 ml) was administered after delivery. Extradural solution was only given before delivery if the intrathecal injection failed to produce a block above T6 or the patient required further analgesia. Postoperative analgesia was provided with i.v. morphine patient-controlled analgesia. At operation, intrathecal fentanyl reduced the need to administer extradural solution before delivery, increased the anaesthetist's satisfaction with analgesia and reduced nausea, but increased pruritus. Up to 6 h after delivery there was no difference in postoperative morphine requirements or pain scores. Between 6 h and 23 h there was a 63% increase in morphine requirements in group F. We consider the most likely explanation for this finding to be that intrathecal fentanyl induced acute spinal opioid tolerance.
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