Forensic Sci Med Pathol
Department of Forensic Medicine Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo Bunkyo-ku, 113-0033, Tokyo, Japan,
Published: March 2005
The individual differences in alcohol pharmacokinetics were studied using the one-compartment model with first-order absorption and zero-order elimination kinetics in humans. The blood alcohol concentrations (BACs) were simulated by obtained parameters, absorption rate constant (ka), and climination rate constant (β). The 81 healthy young Japanese volunteers, who had been divided into those without alcohol-induced facial flushing (nonflushers) and those with facial flushing (flushers) according to alcohol patch test results and a questionnaire beforehand, ingested 0.50 g/kg ethanol within 1 minute. Breath alcohol concentrations (BrACs) were measured during absorption and during the elimination period. BACs were obtained based on BrACs. Fifteen percent of subjects exhibited low BAC profile (below 0.4 mg/mL) (first-pass effect [FPE] group), although the majority showed normal BAC profile (normal group). The ka was approximately 5 to 8 (h(-1)) in the normal group without significant difference between nonflushers and flushers, whereas that in the FPE group was significantly smaller than in the normal group. For the normal group, peak BACs were well simulated by the one-compartment model with first-order absorption and zero-order elimination kinetics. A considerable portion of subjects exhibited FPE. Absorption of alcohol from the intestine plays an important role in alcohol pharmacokinetics in humans.
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