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Related Experiment Videos

[Fluoride-induced nephrotoxicity: factor fiction?]

M Nuscheler1, P Conzen, D Schwender

  • 1Institut für Anästhesiologie, Ludwig-Maximilians-Universität München.

Der Anaesthesist
|February 1, 1996
PubMed
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The historical 50 mumol/l fluoride threshold for anesthetic nephrotoxicity is outdated. Modern anesthetics like sevoflurane do not cause kidney damage despite elevated fluoride levels, indicating clinical insignificance.

Area of Science:

  • Anesthesiology
  • Nephrology
  • Pharmacology

Background:

  • Methoxyflurane anesthesia in the 1960s was linked to renal dysfunction due to inorganic fluoride ion release.
  • A nephrotoxic threshold of 50 mumol/l serum fluoride was established based on methoxyflurane, and later applied to other fluorinated anesthetics.
  • Prolonged use of enflurane and isoflurane can elevate fluoride levels above 50 mumol/l without reported renal dysfunction.

Purpose of the Study:

  • To re-evaluate the clinical significance of elevated serum fluoride concentrations associated with modern volatile anesthetics.
  • To determine if the historical 50 mumol/l nephrotoxicity threshold remains applicable to sevoflurane, enflurane, and isoflurane.

Main Methods:

  • Review of clinical data and studies on methoxyflurane, enflurane, isoflurane, and sevoflurane.

Related Experiment Videos

  • Analysis of reported postoperative renal dysfunction in relation to serum fluoride concentrations.
  • Consideration of intrarenal metabolism of volatile anesthetics.

    • Main Results:

    • Sevoflurane metabolism leads to fluoride concentrations frequently exceeding those of enflurane.
    • Despite elevated fluoride levels, no renal toxicity has been observed with sevoflurane, even in prolonged use or in patients with renal disease.
    • Enflurane and isoflurane can also produce fluoride levels above 50 mumol/l without causing nephrotoxicity.

    Conclusions:

    • The 50 mumol/l serum fluoride concentration is no longer a reliable indicator of nephrotoxicity for isoflurane, enflurane, or sevoflurane.
    • Elevated fluoride levels following sevoflurane anesthesia are clinically insignificant and do not predict renal dysfunction.
    • New understanding of intrarenal anesthetic metabolism likely explains the absence of fluoride-related toxicity with sevoflurane.