Background: This study was conducted to compare efficiency of different concentrations of lidocaine in intravenous regional anesthesia in terms of onset and duration of sensory and motar blockade. Methods: Sixty patients were divided in to 2 groups; the first group received 0.5% concentration of 30-40 ml of lidocaine and the second group received 2% of lidocaine 12-15ml.preoperative and intraoperative hemodynamic parameters were monitored and recorded at 1,5,10,20,30,40 minutes after anesthesia. Results: The onset time of sensorial block was shorter and duration of sensorial block was longer in group 2 than group 1.the onset of motor blockade and duration of motor blockade was longer in group 2 than group 1.there was no comparatively significant differences in hemodynamic vital parameters in both groups. Conclusions: IVRA with 2% ligocaine is effective and safer than the 0.5% ligocaine.

Keywords: IVRA; 0.5% Lignocaine; 2%Lignocaine; Regional Anaesthesia.