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Related Experiment Videos

Amiodarone: historical development and pharmacologic profile.

B N Singh

    American Heart Journal
    |October 1, 1983
    PubMed
    Summary

    Amiodarone hydrochloride, an antiarrhythmic drug, effectively controls cardiac dysrhythmias through unique electrophysiologic and pharmacokinetic properties. Understanding its long-term effects is crucial for safe and rational therapeutic use.

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    Area of Science:

    • Pharmacology
    • Cardiac Electrophysiology
    • Drug Metabolism

    Background:

    • Amiodarone hydrochloride, initially developed as a coronary dilator, is now recognized for its potent antiarrhythmic properties.
    • Recent data highlight its unusual electrophysiologic, pharmacologic, and pharmacokinetic characteristics.

    Purpose of the Study:

    • To explore the electrophysiologic, pharmacologic, and pharmacokinetic properties of amiodarone hydrochloride.
    • To understand the mechanisms behind its efficacy in controlling cardiac dysrhythmias.

    Main Methods:

    • Review of clinical and experimental data on amiodarone hydrochloride.
    • Analysis of its effects on cardiac action potential duration, effective refractory period, and electrophysiologic parameters.
    • Pharmacokinetic evaluation, including elimination half-life and onset of therapeutic effect.

    Main Results:

    • Amiodarone hydrochloride is a potent coronary dilator with minimal direct negative inotropic effects and mild noncompetitive sympathetic antagonism.
    • It exhibits a long elimination half-life, leading to a delayed and variable onset of therapeutic effect.
    • Long-term administration lengthens action potential duration and effective refractory period in cardiac tissues, suppressing ectopic activity.

    Conclusions:

    • Amiodarone hydrochloride's antiarrhythmic efficacy in supraventricular and ventricular tachyarrhythmias is linked to its ability to suppress ectopic activity and prolong the effective refractory period.
    • Clinical effects differ between oral and intravenous administration, necessitating a thorough understanding of its properties for safe and effective use.

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