Serum inorganic fluoride levels in obese patients during and after enflurane anesthesia

J. B. Bentley, R. W. Vaughan, M. S. Miller, J. M. Calkins, A. J. Gandolfi

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29 Scopus citations


Serum ionic fluoride levels in 24 markedly obese patients (127.6 ± 6.0 kg) and 7 nonobese control subjects (67.3 ± 1.2 kg) were compared during and following enflurane anesthesia (<2.0 MAC hr). Peak serum fluoride levels were higher (28.0 ± 1.9 vs 17.3 ± 1.3 μM/L, p < 0.01) and the rate at which fluoride levels increased was more rapid (slope 5.6 vs 2.5 μM/L/hr) in obese patients than in control patients. No clinical evidence of nephrotoxicity was found in either group. Vasopressin resistance tests were not performed, and thus it is unknown whether subclinical nephrotoxicity occurred in either study group. Possible reasons for increased enflurane metabolism in obesity are discussed. These possibilities include differences in fluoride ion kinetics, hepatic delivery and penetration of volatile anesthetics, and altered hepatic microsomal enzyme activity. Obesity rather than weight is an important determinant of anesthetic biotransformation.

Original languageEnglish (US)
Pages (from-to)409-412
Number of pages4
JournalAnesthesia and analgesia
Issue number5
StatePublished - 1979

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine


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