• Br J Clin Pharmacol · Aug 1976

    Cardiovascular effects of labetalol during halothane anaesthesia.

    • D B Scott, F P Buckley, G B Drummond, D G Littlewoods, and W R Macrae.
    • Br J Clin Pharmacol. 1976 Aug 1; 3 (4 Suppl 3): 817-21.

    Abstract1 The circulatory effects of labetalol 25 mg intravenously in six patients during 1% halothane anaesthesia were studied. 2Labetalol caused a marked decrease in arterial pressure and a consistent but modest (20%) decrease in cardiac output. Heart rate was slowed and stroke volume did not change significantly. Central venous pressure increased and peripheral resistance decreased. 3 Increasing the halothane concentration of 3% led to marked myocardial depression as evidenced by reduced cardiac output and increased central venous pressure with increasing arterial hypotension. 4 Labetalol may be a suitable drug for controlling induced hypotension under general anaesthesia, although high concentrations of halothane should be used with care.

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