• M A Samkaoui, A Bouaggad, R al Harrar, M A Bouderka, and O Abbassi.
• Service d'anesthésie-réanimation des urgences chirurgicales, CHU Ibn Rochd, Casablanca 20000, Maroc.
• Ann Fr Anesth Reanim. 2001 Mar 1;20(3):255-9.

ObjectiveEvaluate the effect of the addition of clonidine to lidocaine on postoperative pain after intravenous regional anaesthesia.Study DesignDouble blind prospective study.Patients And MethodsForty-five patients were randomly allocated to two groups: group 1 (n = 25) receiving 3 mg.kg-1 of lidocaine 0.5% added to saline and group 2 (n = 20) receiving 3 mg.kg-1 of lidocaine 0.5% added to clonidine (150 micrograms). Postoperative analgesia was assessed using a visual analogue pain score (VAPS) and the time to first analgesic request. The incidence of side effects after tourniquet release was noted. Analysis of variance, Kruskall Wallis and chi 2 tests were used for statistical analysis. A p-value of < 0.05 was considered significant.ResultsAge, ASA class, duration and type of surgery, tourniquet time and sensory block duration were comparable for the two groups. The time to first antalgic request after deflation of tourniquet was similar in the two groups (38 +/- 15 min versus 44 +/- 19 min), while VAPS score was lower (p < 0.05) in the clonidine group (5.2 versus 6.8). The incidence of side effects was comparable in the two groups.ConclusionThe addition of clonidine (150 micrograms) to lidocaine for intravenous regional anaesthesia improved postoperative analgesia but in a limited and short-lasting manner.

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