PROLONGED INFUSION OF CHLORMETHIAZOLE IN INTENSIVE CARE

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Abstract
Chlormethiazole has proved useful for prolonged sedation in patients receiving artificial ventilation of the lungs during intensive care. In short-term infusions sedation and unconsciousness can be produced quickly and reversal is rapid on stopping the administration. After prolonged infusion, however, recovery is much slower because of accumulation of the drug. The pharmacokinetics of chlormethiazole in both short and prolonged infusions were studied in four patients. Following brief administrations the drug disappeared very quickly from the blood as a result of re-distribution and the patients wakened after a few minutes. Unconsciousness was associated with plasma concentrations in the range of 3–5 (μg ml−1. After 48 h administration, recovery was much slower, the elimination half-life varying from 3.5 to 12.1 h.

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