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Related Experiment Videos

Long-term antiarrhythmic therapy with acetylprocainamide.

J Kluger, S Leech, M M Reidenberg

    The American Journal of Cardiology
    |December 1, 1981
    PubMed
    Summary

    Long-term acetylprocainamide treatment suppressed ventricular premature beats for one year in most patients. However, limited usefulness was observed due to recurrent arrhythmias and adverse effects.

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    Area of Science:

    • Cardiology
    • Pharmacology

    Background:

    • Arrhythmias, particularly ventricular premature beats, pose significant clinical challenges.
    • Acetylprocainamide is an antiarrhythmic drug used for initial suppression of arrhythmias.

    Purpose of the Study:

    • To evaluate the long-term efficacy and safety of acetylprocainamide in suppressing arrhythmias.
    • To assess the persistence of antiarrhythmic effects after one year of treatment.

    Main Methods:

    • Nineteen patients with arrhythmias initially suppressed by acetylprocainamide were enrolled in a long-term treatment study.
    • Ventricular premature beats and ventricular performance (via systolic time intervals) were monitored.
    • Drug withdrawal and placebo substitution were used to assess continued efficacy.

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    Main Results:

    • Eleven of 19 patients continued acetylprocainamide for 12 months, maintaining suppression of ventricular premature beats.
    • Eight patients withdrew due to death (n=6) or arrhythmia recurrence.
    • Ventricular performance improved during treatment and declined upon withdrawal.
    • Symptomatic effects led to dosage reduction or discontinuation in seven patients.

    Conclusions:

    • Acetylprocainamide demonstrated sustained suppression of ventricular premature beats for up to one year in a subset of patients.
    • High withdrawal rates due to mortality and recurrent arrhythmias limit its long-term clinical utility.
    • The presence of procainamide due to deacetylation suggests potential contribution to both efficacy and adverse effects.