• Br J Anaesth · Feb 1993

    Plasma concentrations of bupivacaine and its enantiomers during continuous extrapleural intercostal nerve block.

    • R G Berrisford, S Sabanathan, A J Mearns, B J Clarke, and A Hamdi.
    • Department of Thoracic Surgery, Bradford Royal Infirmary.
    • Br J Anaesth. 1993 Feb 1; 70 (2): 201-4.

    AbstractPlasma concentrations of bupivacaine have been measured in 12 patients given bupivacaine through a paravertebral catheter placed under direct vision at thoracotomy. After an initial bolus of 0.5% bupivacaine 20 ml, mean (SEM) Cpmax was 1.45 (0.32) micrograms ml-1 and median (range) tCpmax was 25 (10-60) min. A concentration of 4.43 micrograms ml-1 measured in one patient was not associated with toxic signs. During continuous infusion of bupivacaine for 120 h, Cpmax was 4.9 (0.7) micrograms ml-1 and tCpmax 48 (5-96) h. No symptoms or signs of toxicity occurred. Separate measurement of R- and S-bupivacaine concentrations demonstrated significantly different concentration-time profiles.

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