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Received from the Department of Anesthesiology, Rebecca Sieff Government Hospital, Safed, Israel, and the Department of Anesthesiology, University of Alabama at Birmingham, Birmingham, Alabama.
Abstract
The effect of thiopental on the induction dose-response curve for midazolam was studied innonpremedicated ASA physical status I and II patients. As an endpoint of anesthesia, ability to open eyes on command was used. Dose-response curves for thiopental, midazolam, and their combination were determined with a probit procedure and compared with an isobolographic analysis. Interaction between midazolam and thiopental was found to be synergistic (supraadditive). The degree of midazolam-thiopental anesthetic synergism in surgical patients was close to that reported previously in rats with loss of the righting reflex as an index of anesthesia.
Key Words: ANESTHETIC, INTRAVENOUS—midazolam, thiopental INTERACTIONS, DRUGS—barbiturates, benzodiazepines
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