BJA Advance Access originally published online on October 29, 2004
British Journal of Anaesthesia 2005 94(1):112-116; doi:10.1093/bja/aei009
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© The Board of Management and Trustees of the British Journal of Anaesthesia 2004
Clonidine as an adjuvant to local anaesthetic axillary brachial plexus block: a randomized, controlled study
Department of Anesthesiology and General Intensive Care, Medical University of Vienna, Waehringer Guertel 18-20/9i, 1090 Vienna, Austria
* Corresponding author. E-mail: andreas.duma{at}schmerzlos.info
Background. We compared the effects of clonidine added to levobupivacaine and bupivacaine on axillary brachial plexus block as well as the effectiveness of levobupivacaine alone compared with bupivacaine alone.
Methods. In this prospective, randomized, controlled, double-blind trial, four groups of 20 patients each were investigated, using (i) 40 ml of levobupivacaine 0.5% plus 0.150 mg of clonidine, (ii) 40 ml of levobupivacaine 0.5% plus 1 ml of NaCl 0.9%, (iii) 40 ml of bupivacaine 0.5% plus 0.150 mg of clonidine, and (iv) 40 ml of bupivacaine 0.5% plus 1 ml of NaCl 0.9%, respectively. The onset of motor and sensory block and duration of sensory block were recorded.
Results. There was no significant difference in duration between groups, but a significantly higher variance (P<0.001) was found in the two groups with clonidine than in the two groups without.
Conclusions. These findings suggest responder and non-responder behaviour is a result of the addition of clonidine.
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