Effect of mixture versus sequential injections of lignocaine and bupivacaine on block characteristics for supraclavicular brachial plexus nerve block in patients undergoing upper limb surgery. A randomised clinical trial.

This study is a randomised, double blind, parallel group, trail comparing the effect of mixture versus sequential injections of 2% lignocaine with adrenaline and 0.5% bupivacaine for supraclavicular brachial plexus nerve block in 152 patients undergoing upper limb surgery. The primary outcome measures will be the duration of sensory block. The secondary outcomes will be onset of sensory and motor block, the duration of motor block, the duration of analgesia, the percentage of patients having block in all four nerve areas by 15 min.