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- W1878553387 abstract "Previous studies have indicated concentration-dependent inhibition of halothane's biotransformation by the hepatic cytochrome P-450 enzyme system. In order to investigate this phenomenon in the guinea pig model of acute halothane-associated hepatotoxicity, male outbred Hartley guinea pigs underwent 4 hr inhalation exposures to either subanesthetic (0.1%) or anesthetic (1.0%) concentrations of halothane with 40% O2. Plasma concentrations of the primary halothane metabolite, trifluoroacetic acid (TFA) were one-half as great immediately (0 hr) after the 1% exposure as they were with 0.1%. By 10 hr after exposure plasma TFA had increased significantly in both treatment groups. However, there was a much greater rate of increase with 1% halothane so that values were now more than 50% greater than with 0.1% halothane. Plasma TFA in the 1% halothane group remained significantly greater over the 96-hr time course of the experiment. Covalent binding of reactive halothane biotransformation intermediates to hepatic protein paralleled plasma TFA. At 0 hr, the degree of binding in the 1% halothane group was one-half as great as in the 0.1% group and by 10 hr after had increased to be nearly twice as great as the 0.1% group that had not increased between the time points. These data provide strong evidence for substrate-specific inhibition of halothane biotransformation with the majority of biotransformation occurring in the hours following exposure to an anesthetic (1%) concentration of the drug. These metabolic dynamics should be considered in studies of other organohalogens, including the new refrigerants that are structurally similar to halothane." @default.
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- W1878553387 date "1993-03-01" @default.
- W1878553387 modified "2023-09-23" @default.
- W1878553387 title "Concentration-dependent inhibition of halothane biotransformation in the guinea pig." @default.
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