PLASMA CONCENTRATIONS OF LOCAL ANAESTHETICS AFTER INTERSCALENE BRACHIAL PLEXUS BLOCK

Abstract
Plasma concentrations of local anesthetic agents were measured after 40 interscalene brachial plexus blocks in 39 patients, using lignocaine, prilocaine, bupivacaine and etidocaine. Lignocaine produced greater concentrations than prilocaine, and bupivacaine greater concentrations than etidocaine. The addition of adrenaline [epinephrine] resulted in much lower concentrations in the case of all 4 agents.