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Related Experiment Videos

Verapamil in ventricular tachycardia.

Y Hasin, M Kriwisky, M S Gotsman

    Cardiology
    |January 1, 1984
    PubMed
    Summary

    Verapamil accelerated ventricular tachycardia (VT) rates and prevented sustained VT in patients, unlike procainamide which slowed it. Verapamil showed potential as an oral antiarrhythmic therapy.

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    Area of Science:

    • Cardiology
    • Pharmacology

    Background:

    • Ventricular tachycardia (VT) is a critical arrhythmia.
    • Assessing antiarrhythmic drug effects on VT is crucial for patient management.

    Purpose of the Study:

    • To compare the effects of verapamil and high-dose procainamide on induced and spontaneous ventricular tachycardia (VT).

    Main Methods:

    • Electrophysiological study in 10 patients with VT.
    • Administration of verapamil and procainamide.
    • Measurement of tachycardia rate (R-R interval).

    Main Results:

    • Verapamil significantly increased VT rate (decreased R-R interval from 278±54 ms to 233±32 ms, p<0.025).
    • Procainamide significantly slowed VT rate (mean R-R interval 328±72 ms, p<0.02).
    • Verapamil prevented sustained VT induction and was effective in 2 patients for chronic oral therapy.

    Conclusions:

    • Verapamil accelerates VT, potentially by increasing conduction velocity or shortening the reentrant cycle.
    • Procainamide slows VT, acting as a conventional antiarrhythmic.
    • Verapamil's pro-arrhythmic effect warrants caution, despite potential chronic therapeutic use.

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