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  • Title: Metabolism of synthane: comparison with in vivo and in vitro defluorination of other halogenated hydrocarbon anaesthetics.
    Author: Mazze RI, Beppu WJ, Hitt BA.
    Journal: Br J Anaesth; 1979 Sep; 51(9):839-44. PubMed ID: 508489.
    Abstract:
    Aerobic defluorination of the inhalation anaesthetic agent, synthane, was compared with that of methoxyflurane, enflurane and halothane and with two other anaesthetics, isoflurane and sevoflurane. In vitro, in microsomes prepared from phenobarbitone-induced and control livers, synthane and halothane were not defluorinated. The relative order of defluorination of the other anaesthetics was methoxyflurane greater than enflurane greater than isoflurane. In vivo, following 4 h of 1.2% (MAC) synthane anaesthesia, urinary inorganic fluoride excretion was increased by only a trivial amount and only in phenobarbitone-treated rats; polyuria was not observed. Synthane is the least metabolized of the fluorinated ether anaesthetics; its administration will not result in inorganic fluoride nephropathy. An index of nephrotoxic potential for fluorinated anaesthetic agents was formulated utilizing in vitro fluoride production data and oil: gas partition coefficients.
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