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Related Experiment Videos

Use of calcium antagonists in ventricular dysfunction.

M A Josephson, B N Singh

    The American Journal of Cardiology
    |January 25, 1985
    PubMed
    Summary

    Calcium antagonists like verapamil, nifedipine, and diltiazem have varied hemodynamic effects. Caution is advised when using these agents in patients with impaired heart function.

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    Area of Science:

    • Cardiology
    • Pharmacology

    Background:

    • Calcium antagonists are frequently prescribed for cardiocirculatory disorders.
    • Many of these conditions involve impaired myocardial function.

    Purpose of the Study:

    • To evaluate the hemodynamic effects of calcium antagonists in patients with normal and depressed ventricular function.
    • To determine the clinical relevance of these effects in various cardiac conditions.

    Main Methods:

    • Review of existing clinical data on verapamil, nifedipine, and diltiazem.
    • Analysis of their impact on myocardial function and ventricular pressures.

    Main Results:

    • Verapamil, nifedipine, and diltiazem show minimal negative inotropic effects in normal hearts.
    • Verapamil and diltiazem may increase left ventricular end-diastolic pressure.
    • Nifedipine generally improves function in depressed hearts if sympathetic reflexes are intact, but deterioration is possible.

    Conclusions:

    • Calcium antagonists are not recommended as afterload-reducing agents in heart failure.
    • Careful consideration is necessary when administering these drugs to patients with compromised ventricular performance.

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