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Alternate ventriculoatrial Wenckebach conduction

S Levy, R Roudaut, E Bouvier

    Circulation
    |March 1, 1980
    PubMed
    Summary

    This study describes retrograde alternate Wenckebach periods, a type of 2:1 ventriculoatrial (VA) block. These findings offer insights into cardiac conduction block and its clinical significance.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Electrophysiology

    Background:

    • Wenckebach block typically refers to atrioventricular (AV) block.
    • Retrograde conduction from the ventricles to the atria can exhibit unique block patterns.

    Purpose of the Study:

    • To present and characterize cases of retrograde alternate Wenckebach periods.
    • To explore the electrophysiological properties and clinical implications of this specific block pattern.

    Main Methods:

    • Case series presentation.
    • Analysis of electrocardiographic findings in three patients with 2:1 ventriculoatrial (VA) block.
    • Electrophysiological studies to attempt localization of the block level.

    Main Results:

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    • Three cases of retrograde alternate Wenckebach periods were identified.
    • This pattern involves progressive prolongation of ventriculoatrial (VA) conduction time followed by blocked beats.
    • In one case, the block was localized to the atrioventricular (AV) node; in two cases, the location was undetermined.
    • Evidence supports the concept of multilevel block within the AV node.

    Conclusions:

    • Retrograde alternate Wenckebach periods are a distinct phenomenon of 2:1 VA block.
    • This condition may explain variations in atrial depolarization during ventricular tachycardia.
    • Understanding this block pattern is clinically significant for interpreting complex cardiac arrhythmias.