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Related Experiment Videos

Intraventricular reentry with narrow QRS complex

C P Reddy, A Khorasanchian

    Circulation
    |March 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A novel His-Purkinje reentry (V3) phenomenon was identified where left bundle branch divisions act separately. This differs from typical V3, offering new insights into ventricular conduction.

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    Area of Science:

    • Electrophysiology
    • Cardiology

    Background:

    • Reentry within the His-Purkinje system, known as the V3 phenomenon, is common during ventricular refractory period studies.
    • Typically, both left bundle branch divisions function as one limb in this reentry circuit, resulting in V3 beats with bundle branch block patterns.

    Observation:

    • This study describes a new V3 phenomenon in three patients.
    • The reentry circuit involved one left bundle branch division as the retrograde limb and the right bundle branch and the other left bundle branch division as the antegrade limbs.

    Findings:

    • This distinct reentry pattern was confirmed by narrow V1V2 intervals, critical retrograde His-Purkinje conduction delays (V2H2), and lack of reentry with retrograde block.
    • The V3 beats had QRS duration <90 msec, and in most patients, the HV interval matched sinus beats.

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    Implications:

    • This finding reveals a previously undescribed mechanism of His-Purkinje reentry.
    • Understanding this new V3 pattern can refine interpretations of ventricular electrophysiology studies and arrhythmia mechanisms.