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Related Experiment Videos

The proarrhythmic effects of flecainide.

A W Nathan, K J Hellestrand, R S Bexton

    Drugs
    |January 1, 1985
    PubMed
    Summary

    Flecainide acetate, a potent antiarrhythmic drug, can cause proarrhythmic effects in some patients, including ventricular arrhythmias and conduction abnormalities. Careful patient selection and monitoring are crucial when using this medication.

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    Area of Science:

    • Cardiology
    • Clinical Pharmacology

    Background:

    • Flecainide acetate is a potent Class I antiarrhythmic agent.
    • This study evaluated the proarrhythmic effects of flecainide in a large patient cohort.

    Observation:

    • Proarrhythmic effects were observed in 7 out of 152 patients treated with flecainide.
    • Conduction abnormalities included PR interval prolongation and QRS widening; no significant sinus bradyarrhythmias were induced.
    • Ventricular tachycardia or fibrillation occurred in 5 patients, 3 of whom had pre-existing ventricular arrhythmias.

    Findings:

    • QT and QTc interval prolongation was noted, primarily due to QRS widening.
    • Proarrhythmic events occurred with both normal and high flecainide concentrations.
    • Specific effects included induction of antidromic tachycardia in a Wolff-Parkinson-White patient and accelerated ventricular rates in atrial flutter.

    Implications:

    • Flecainide can induce serious proarrhythmic events, necessitating careful patient selection and monitoring.
    • The risk of proarrhythmia exists even in patients without pre-existing conduction abnormalities.
    • Co-administration with other antiarrhythmic agents may influence flecainide's proarrhythmic potential.

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