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Related Experiment Videos

Sinus node re-entrant tachycardia in man.

G M Weisfogel, W P Batsford, K L Paulay

    American Heart Journal
    |September 1, 1975
    PubMed
    Summary

    Sinus node re-entry tachycardia (SNRT) can be sustained and initiated by electrical stimulation. Electrophysiologic study helps differentiate SNRT from other tachycardias like AV nodal re-entry.

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    Area of Science:

    • Electrophysiology
    • Cardiology
    • Cardiac Electrophysiology

    Background:

    • Sinus node re-entry (SNR) is typically a single ectopic beat.
    • Sustained sinus node re-entry tachycardia (SNRT) is less common but clinically significant.

    Purpose of the Study:

    • To describe the electrophysiologic characteristics of sustained sinus node re-entry tachycardia (SNRT).
    • To differentiate SNRT from atrioventricular nodal re-entry (AVNRT).

    Main Methods:

    • Electrophysiologic study in six patients with sustained SNRT.
    • Analysis of atrial activation sequence, P-wave morphology, and cycle length.
    • Exclusion of atrioventricular nodal re-entry and stimulation site re-entry.

    Main Results:

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    • SNRT was initiated by premature atrial or ventricular pacing.
    • Atrial activation was high-to-low, with P-wave morphology similar to sinus rhythm.
    • SNRT cycle lengths ranged from 625 to 320 msec and terminated spontaneously or with intervention.

    Conclusions:

    • Sustained SNRT can be induced and characterized by specific electrophysiologic findings.
    • Distinctive features allow differentiation of SNRT from AVNRT.
    • Understanding SNRT mechanisms is crucial for accurate diagnosis and management.