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Related Experiment Videos

Reciprocal tachycardias using accessory pathways with long conduction times.

J Farré, D Ross, I Wiener

    The American Journal of Cardiology
    |November 1, 1979
    PubMed
    Summary

    This study details three cases of reentrant tachycardia involving accessory pathways with prolonged conduction times. These unique pathways exhibited unidirectional conduction, impacting tachycardia mechanisms and localization.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Anatomy

    Background:

    • Reentrant tachycardia can be sustained by accessory pathways that bypass normal atrioventricular (A-V) conduction.
    • Accessory pathways with significantly long conduction times present unique electrophysiological characteristics.

    Purpose of the Study:

    • To describe the electrophysiological properties and anatomical localization of accessory pathways with very long conduction times in three patients with reentrant tachycardia.
    • To elucidate the role of these unique accessory pathways in the tachycardia circuit.

    Main Methods:

    • Case series analysis of three patients with reentrant tachycardia.
    • Electrophysiological study to assess accessory pathway conduction properties (unidirectional conduction, decremental conduction).

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  • Analysis of tachycardia circuit and pathway localization (septal, atrial/ventricular exits).

    • Main Results:

    • All three patients had reentrant tachycardia involving an accessory pathway with a very long conduction time.
    • Two patients demonstrated retrograde-only accessory pathway conduction, suggesting septal location and bypassing the A-V node.
    • One patient showed anterograde conduction with wide QRS during tachycardia, with the pathway possibly near the right ventricular apex.

    Conclusions:

    • Accessory pathways with very long conduction times can sustain reentrant tachycardia through unidirectional conduction.
    • Pathway location (septal, right ventricular apex) influences electrophysiological behavior and tachycardia characteristics.
    • These findings highlight the diverse anatomical and functional substrates for cardiac arrhythmias.