Abstract
The incidence of increased drug metabolism activity as a consequence of multiple drug therapy at a surgical intensive care ward has been studied non-invasively by determinations of daily urinary D-glucaric acid (GA) excretion rates. Among 165 randomly selected patients, GA excretion was stimulated in 76 cases (= 46%). Exploratory data analysis showed that increases in GA excretion are primarily due to administration of barbiturates (pentobarbitone, Nembutal), miconazole (Daktar) and, to a lesser extent, neuroleptics. Surprisingly, the large number of simultaneously administered additional drugs failed to increase GA excretion. Urinary 6 beta-hydroxycortisol (6 beta-OHF) and 17-hydroxycorticosteroid (17-OHCS) excretion rates were correlated in 34 patients with GA excretion; patients not receiving known enzyme inducers showed low GA values but high 6 beta-OHF and 17-OHCS values, however, with a ratio of 6 beta-OHF/17-OHCS in the normal range. Patients receiving high dose pentobarbitone treatment failed to exhibit significantly increased 6 beta-OHF and 17-OHCS or 6 beta-OHF/17-OHCS values. Miconazole treatment resulted in a significantly increased ratio of 6 beta-OHF/17-OHCS. gamma-Glutamyltranspeptidase activity in serum showed no correlation with GA excretion (n = 91).
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