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Related Experiment Videos

Verapamil decreases MAC for halothane in dogs.

M Maze, D M Mason, R E Kates

    Anesthesiology
    |October 1, 1983
    PubMed
    Summary

    Verapamil hydrochloride, a cardiovascular drug, was found to reduce anesthetic requirements. This study shows verapamil significantly lowers the minimum alveolar concentration (MAC) for halothane anesthesia in dogs.

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    Area of Science:

    • Anesthesiology
    • Pharmacology

    Background:

    • Verapamil hydrochloride is increasingly used for cardiovascular conditions during surgery.
    • Verapamil exhibits non-selective calcium channel blocking activity, also affecting sodium channels.
    • Sodium channel blockers are known to influence anesthetic needs.

    Purpose of the Study:

    • To investigate the effect of verapamil on the minimum alveolar concentration (MAC) of halothane in dogs.
    • To determine if verapamil alters anesthetic requirements due to its sodium channel activity.

    Main Methods:

    • The study measured the MAC for halothane in canine subjects.
    • Halothane MAC was assessed before and after administering a therapeutic dose of verapamil (0.5 mg/kg).
    • Verapamil plasma levels were monitored to ensure a therapeutic concentration was achieved.

    Main Results:

    • A statistically significant 25% reduction in halothane MAC was observed (from 0.97% to 0.72%, P < 0.01).
    • This reduction occurred when dogs reached a therapeutic plasma level of verapamil (64 ng/mL).

    Conclusions:

    • Dl-verapamil may reduce anesthetic requirements for halothane, potentially due to its local anesthetic-like sodium channel blocking properties.
    • Clinical adjustments in anesthetic dosage might be necessary for patients receiving verapamil during perioperative care.

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