• Can J Anaesth · Nov 1991

    Randomized Controlled Trial Comparative Study Clinical Trial

    Metabolism of desflurane and isoflurane to fluoride ion in surgical patients.

    • R M Smiley, E Ornstein, E J Pantuck, C B Pantuck, and R S Matteo.
    • Department of Anesthesiology, Columbia University College of Physicians and Surgeons, New York, NY 10032.
    • Can J Anaesth. 1991 Nov 1; 38 (8): 965-8.

    AbstractThe metabolism of isoflurane and the investigational volatile anaesthetic desflurane to fluoride ion was examined in 25 surgical patients. The patients were randomly assigned to four groups, to receive isoflurane or desflurane at either 0.65 MAC or 1.25 MAC. Anaesthesia was induced in all patients with thiopentone and midazolam and included nitrous oxide 60% in addition to the volatile agent. Blood was drawn before induction and at the end of the operation for determination of serum fluoride ion concentration. Plasma fluoride ion concentrations increased (+ 1.36 +/- 0.93 microM, P less than 0.01) in patients receiving isoflurane but were unchanged (-0.13 +/- 0.50 microM) in patients receiving desflurane. Metabolic release of fluoride ion is less with desflurane than with isoflurane during administration of the anaesthetics to surgical patients, and is unlikely to be of clinical significance.

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