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Related Experiment Videos

Midazolam sedation following open heart surgery.

H M Mathews, I W Carson, P S Collier

    British Journal of Anaesthesia
    |May 1, 1987
    PubMed
    Summary

    Continuous infusion of midazolam provides faster stable plasma concentrations for postoperative sedation compared to intermittent injections. This method ensures quicker drug level stabilization and faster decline post-therapy in patients after cardiopulmonary bypass.

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    Area of Science:

    • Pharmacology
    • Anesthesiology
    • Critical Care Medicine

    Background:

    • Postoperative sedation is crucial for patients recovering from cardiopulmonary bypass.
    • Midazolam is a commonly used sedative agent.
    • Optimizing midazolam administration can improve patient outcomes and resource utilization.

    Purpose of the Study:

    • To compare the pharmacokinetic profiles of midazolam administered via continuous infusion versus intermittent injections for postoperative sedation.
    • To determine the time to achieve stable plasma concentrations and the duration of drug effect after discontinuation.

    Main Methods:

    • A comparative study involving patients undergoing cardiopulmonary bypass.
    • Administration of midazolam via hourly intermittent injections versus continuous infusion at the same dosage.

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  • Monitoring of plasma midazolam concentrations over time.

    • Main Results:

    • Continuous infusion rapidly achieved stable midazolam plasma concentrations.
    • Intermittent injections required 6-8 hours to reach stable trough concentrations.
    • Plasma concentrations declined rapidly within 6 hours after stopping infusion.
    • One patient exhibited high concentrations and a prolonged half-life, suggesting slow metabolism.

    Conclusions:

    • Continuous infusion of midazolam is more efficient for achieving rapid and stable plasma concentrations in postoperative sedation.
    • Intermittent injections lead to delayed achievement of therapeutic levels.
    • Further investigation into genetic factors influencing midazolam metabolism may be warranted.