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Ionic currents in cardiac muscle: a framework for glycoside action.

G W Beeler

    Federation Proceedings
    |August 1, 1977
    PubMed
    Summary

    Cardiac glycosides

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    Area of Science:

    • Cardiovascular Physiology
    • Pharmacology

    Background:

    • Cardiac excitation-contraction coupling is crucial for heart function.
    • Cardiac glycosides are used to treat heart failure and arrhythmias.

    Purpose of the Study:

    • To review the current understanding of cardiac glycoside action.
    • To elucidate the mechanisms underlying the inotropic effects and toxicity of cardiac glycosides.

    Main Methods:

    • Review of existing literature, including voltage clamp studies.
    • Analysis of ionic currents and their role in cardiac glycoside action.

    Main Results:

    • Glycoside inotropic effects may not directly result from increased Ca2+ influx during action potentials.
    • Inhibition of Na+,K+-ATPase alters ionic exchange mechanisms, contributing to inotropic effects.
    • A dynamic, depolarizing current, mediated by extracellular Ca2+, is involved in glycoside toxicity.

    Conclusions:

    • Membrane ionic currents play a secondary role in glycoside inotropism.
    • Ionic currents are also secondary contributors to many toxic effects of cardiac glycosides.

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