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Received from the Department of Anesthesiology and Pharmacology, University of Turku, Turku, Finland and from the Department of Clinical Pharmacology, University of Helsinki, Helsinki, Finland. Address correspondence to Dr. Salonen, Fellow in Anesthesiology, Turku University Central Hospital, Kiinamyllynkatu 4–8, 20520 Turku 52, Finland.
Abstract
The pharmacokinetics of midazolam was studied in 21 children undergoing elective surgery at five different dose levels for induction of general anesthesia and were compared with a control group (n = 6) given thiopental, 5 mg/kg. The clearance of midazolam was found to be dose-related. The elimination half-life varied from 0.79 to 2.83 hr, which is shorter than in adult patients. Even a dose of 0.6 mg/kg midazolam was found to be unreliable as an agent for induction of anesthesia. Compared with thiopental 5 mg/kg, significantly longer times of onset to closing of the eyes (P<0.01) and the disappearance of eyelid reflex (P<0.01) were seen with midazolam.
Key Words: HYPNOTICS, BENZODIAZEPINES—midazolam. INDUCTION, ANESTHESIA—midazolam. ANESTHETICS, INTRAVENOUS—benzodiazepines. ANESTHESIA—pediatric.
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