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Anesth Analg 2000;90:1384-1389
© 2000 International Anesthesia Research Society


OBSTETRIC ANESTHESIA

Ambulatory Labor Epidural Analgesia: Bupivacaine Versus Ropivacaine

David C. Campbell, MD, MSc, FRCPC, Rhonda M. Zwack, MD, Lesley-Ann L. Crone, MD, FRCPC, and Ray W. Yip, MD, FRCPC

Department of Anesthesiology, Royal University Hospital, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

Address correspondence and reprint requests to David C. Campbell, MD, MSc, FRCPC, Department of Anesthesiology, Royal University Hospital, University of Saskatchewan, 103 Hospital Dr., Saskatoon, Saskatchewan, Canada S7N 0W8. Address e-mail to campbelld{at}sdh.sk.ca

Dilute concentrations of bupivacaine combined with fentanyl have recently been used to initiate labor epidural analgesia in an attempt to balance adequate analgesia and minimal maternal motor blockade. Similar concentrations of ropivacaine have not been evaluated. This prospective, randomized, double-blinded study was designed to compare the efficacy of 20 mL of either 0.08% bupivacaine plus 2 µg/mL fentanyl or 0.08% ropivacaine plus 2 µg/mL fentanyl to initiate ambulatory labor epidural analgesia. Forty nulliparous women in early (<=5 cm) established labor received either 20 mL of 0.08% bupivacaine plus 2 µg/mL fentanyl (BF) or 0.08% ropivacaine plus 2 µg/mL fentanyl (RF) to initiate epidural analgesia. One woman (BF) required supplemental analgesia, and two (one BF and one RF) had visual analog scale scores > 0 but < 20 at 20 min. The time (mean ± SD) to visual analog scale score = 0 was BF (n = 18): 12.0 ± 4.5 min and RF (n = 19): 12.4 ± 4.0 min (P > 0.05). Spontaneous micturition was observed in 65% (13 of 20) BF compared with 100% (20 of 20) RF (P < 0.01), and ambulation was demonstrated in 75% (15 of 20) BF compared with 100% (20 of 20) RF (P < 0.03). The incidence of forceps delivery was 35% (7 of 20) BF compared with 10% (2 of 20) RF (P < 0.04). The results of this study indicate that dilute ropivacaine combined with fentanyl effectively initiates epidural analgesia while concurrently preserving maternal ability to void and ambulate.

Implications: As compared with a similar dilute concentration of bupivacaine, 20 mL of dilute (0.08%) ropivacaine combined with fentanyl (2 µg/mL) effectively initiates epidural analgesia in nulliparous women in early, established labor while preserving their ability to micturate and ambulate. Of importance, it appears that a true ambulatory epidural analgesic for women in labor is now possible.




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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 © 2000 by the International Anesthesia Research Society.