British Journal of Anaesthesia, Vol 80, Issue 3 289-293, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia
C. R. Cox, K. A. Faccenda, C. Gilhooly, J. Bannister, N. B. Scott and LMM. Morrison
Bupivacaine has a chiral centre and is currently available as a racemic
mixture of its two enantiomers: R(+)-bupivacaine and S(-)-bupivacaine.
Preclinical studies have demonstrated that there is enantiomer selectivity
of action with the bulk of central nervous system and cardiovascular
toxicity residing with the R(+) isomer. The aim of this study was to
compare the clinical efficacy and safety of S(-)- bupivacaine with racemic
RS-bupivacaine for extradural anaesthesia. We studied 88 patients
undergoing elective lower limb surgery under lumbar extradural anaesthesia
who received 15 ml of 0.5% or 0.75% S(-)- bupivacaine, or 0.5%
RS-bupivacaine in a randomized, double-blind study. There was no difference
in onset time, maximum spread of sensory block or intensity of motor block
between the three groups. Duration of sensory block was significantly
longer for 0.75% S(-)-bupivacaine. We conclude that S(-)-bupivacaine has
similar local anaesthetic characteristics to RS-bupivacaine when used for
extradural anaesthesia.
CLINICAL INVESTIGATIONS
Extradural S(-)-bupivacaine: comparison with racemic RS-bupivacaine
Department of Anaesthesia, Ninewells Hospital and Medical School, Dundee DD1 9SY; Department of Anaesthesia, St John's Hospital, Howden Road West, Livingston, West Lothian EH54 6PP; Department of Anaesthesia, HCI International Medical Centre, Beardmore Street, Clydebank G81 4HX
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