British journal of anaesthesia
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Randomized Controlled Trial
Effect of concentration of local anaesthetic solution on the ED₅₀ of bupivacaine for supraclavicular brachial plexus block.
The aim of this trial was to compare the effect of concentration of bupivacaine solution on the ED₅₀ dose required for supraclavicular brachial plexus block. ⋯ Our study demonstrates that the ED₅₀ dose of bupivacaine for supraclavicular block is not dependent on the concentration. Lowering the concentration or the strength of the local anaesthetic leads to an increase in the volume required for successful block.