Abstract
Venous plasma bupivacaine concentrations were measured in patients undergoing resection and reconstruction surgery for intra-oral malignancy. Fifth cranial nerve and cervical plexus blocks were performed using 0.5% bupivacaine. Total dosage was higher than recommended by UK manufacturers. Mean peak venous plasma concentrations were higher than previously recorded. A significant difference was found in the peak concentrations when adrenaline [epinephrine] was included. The significance of these results in relation to systemic toxicity and recommended dosage is discussed.

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