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Related Experiment Videos

Retrograde His bundle deflection in bundle-branch re-entry.

A Castellanos, A Embi, J Aranda

    British Heart Journal
    |March 1, 1976
    PubMed
    Summary
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    Premature atrial impulses in a patient with an A-V nodal bypass tract caused atrial echo beats via a reciprocating mechanism involving bundle-branches. This study elucidates the electrophysiological basis of this specific arrhythmia.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Arrhythmias

    Background:

    • Atrial arrhythmias can arise from complex electrophysiological mechanisms.
    • Accessory pathways, such as A-V nodal bypass tracts, can predispose individuals to reentrant tachycardias.
    • Understanding the precise mechanisms of premature atrial contractions is crucial for diagnosis and management.

    Observation:

    • A patient presented with premature atrial impulses triggering atrial echo beats.
    • The arrhythmia involved a reciprocating mechanism utilizing the bundle-branches.
    • Electrocardiographic findings included a retrograde His bundle deflection sandwiched between a right bundle-branch block QRS complex and a negative P wave.

    Findings:

    • The study identified a specific reciprocating mechanism involving the bundle-branches and an A-V nodal bypass tract.

    Related Experiment Videos

  • Retrograde His bundle activation was observed, providing insight into the arrhythmia's timing.
  • At shorter cycle lengths, echo beats were absent due to the effective refractoriness of the bypass tract and A-V node.
  • Concealed retrograde activation of the right bundle branch at faster rates explained the observed right bundle-branch block patterns.

    • Implications:

    • This research clarifies the electrophysiological basis of atrial echo beats in patients with A-V nodal bypass tracts.
    • The findings contribute to the understanding of complex cardiac arrhythmias and their underlying mechanisms.
    • Accurate identification of such mechanisms is vital for effective therapeutic strategies in affected individuals.