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Related Experiment Videos

Rapid ventricular parasystole with possible multilevel exit block

S Ogawa, L S Dreifus, Y Watanbe

    Journal of Electrocardiology
    |July 1, 1981
    PubMed
    Summary

    A rare case of rapid ventricular parasystole (214 bpm) was observed. Reducing digoxin improved exit block, revealing parasystolic tachycardia.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Arrhythmias

    Background:

    • Ventricular parasystole is a rare arrhythmia where an ectopic ventricular pacemaker competes with the sinus node.
    • Understanding the mechanisms of exit block is crucial for managing complex ventricular arrhythmias.

    Observation:

    • A 73-year-old woman presented with ventricular parasystole at an exceptionally high rate of 214 beats per minute.
    • The parasystolic complexes exhibited variable cycle lengths, indicating fluctuating degrees of exit block.
    • Digoxin therapy was associated with increased exit block, masking the underlying rapid parasystole.

    Findings:

    • The variable exit block was best explained by multilevel block or alternating Wenckebach periodicity at the ventriculo-ectopic junction.
    • Discontinuation of digoxin led to a reduction in exit block.
    • Unmasking of a rapid parasystolic tachycardia was observed after digoxin withdrawal.

    Implications:

    • This case highlights the complex interplay between medications and cardiac electrophysiology in ventricular arrhythmias.
    • The findings suggest that digoxin can exacerbate exit block in certain parasystolic conditions.
    • Accurate interpretation of parasystole requires considering factors like medication effects and the concept of multilevel block.

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