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Plasma Concentrations after High Doses of Mepivacaine with Epinephrine in the Combined Psoas Compartment/Sciatic Nerve Block
  1. M. A.M. Simon, M.D.*,
  2. T. B. Vree, PH.D.,
  3. M. J.M. Gielen, PH.D.** and
  4. A. J. Lagerwerf
  1. *Anesthesiologist, Department of Anesthesiology, Medisch Spectrum Twente, The Netherlands
  2. **Associate Professor of Anesthesiology, Institute for Anesthesiology, University of Nijmegen, The Netherlands
  3. Biochemistry Technician, Institute for Anesthesiology, University of Nijmegen, The Netherlands
  4. Head of the Pharmacokinetic Laboratory, Departments of Clinical Pharmacy and Anesthesiology, University of Nijmegen, The Netherlands

Abstract

A combination or psoas compartment block and sciatic nerve block was performed with a total dose of 731.5 mg mepivacaine (55 ml, 133%) with epinephrine (1:600,000) in patients scheduled for orthopedic surgery on one leg. In 20 patients, arterial blood samples were collected at timed intervals over a 6-hour period to determine the mepivacaine plasma concentration. In all patients, good sensory and motor blocks were obtained and no analgesics were required during surgery. Despite the high dose of mepivacaine, the plasma concentrations stayed below 6.0 μg/ml, with one exception, although no clinical signs of local anesthetic toxicity were observed. Plasma pharmacokinetic variables of mepivacaine were as follows: Cmar 4.22 mg·l-1 (SD, 1.28); Tmax: 0.99 hours (SD, 0.76); T½: 3.25 hours (SD, 1.12); CL 0.55 l·hour-1·kg-1.

  • Mepivacaine
  • psoas compartment block
  • sciatic nerve block
  • plasma concentration

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