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Related Experiment Videos

Transverse dissociation of the human His bundle.

B Elencwajg, L Zaman, J J Rozanski

    Pacing and Clinical Electrophysiology : PACE
    |May 1, 1982
    PubMed
    Summary

    Alternating Wenckebach periods, both completed and abortive, were observed in a patient with mitral annulus calcification. This rare arrhythmia stemmed from His bundle dissociation, necessitating pacemaker implantation.

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    Sudden death due to cardiac arrhythmias.

    The New England journal of medicine·2002

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Anatomy

    Background:

    • Wenckebach periods are a type of atrioventricular block characterized by a progressive lengthening of the PR interval followed by a dropped QRS complex.
    • Transverse dissociation involves the splitting of cardiac conduction pathways, leading to complex arrhythmias.
    • Mitral annulus calcification is a common finding that can be associated with cardiac arrhythmias.

    Observation:

    • A symptomatic female patient presented with alternating completed and abortive Wenckebach periods.
    • These arrhythmias were linked to a unique anatomical finding: transverse dissociation of the His bundle into two distinct horizontal levels.
    • A 2:1 block was identified in the distal level, while Wenckebach periods occurred in the proximal level of the His bundle.

    Findings:

    Related Experiment Videos

    • The observed intra-Hisian alternating Wenckebach periods are rare and distinct from those originating in the atrioventricular node.
    • This specific pattern of His bundle dissociation led to symptomatic arrhythmias.
    • The condition required pacemaker implantation for management.

    Implications:

    • Intra-Hisian dissociation causing alternating Wenckebach periods is a rare but significant cause of symptomatic bradycardia.
    • Understanding His bundle anatomy is crucial for diagnosing and managing complex conduction abnormalities.
    • This case highlights the importance of differentiating His bundle dissociation from atrioventricular node dissociation for appropriate clinical management and treatment strategies.