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Related Experiment Videos

Sinus node function in children. Factors influencing its evaluation.

S M Yabek, J M Jarmakani, N K Roberts

    Circulation
    |January 1, 1976
    PubMed
    Summary
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    This study establishes normal sinus node recovery time (SNRT) values in children using overdrive atrial stimulation. Expressing SNRT relative to the resting sinus interval is recommended for accurate pediatric assessments.

    Area of Science:

    • Pediatric Cardiology
    • Electrophysiology
    • Cardiac Physiology

    Background:

    • The sinus node recovery time (SNRT) is a critical electrophysiological parameter.
    • Establishing normal SNRT values in pediatric populations is essential for accurate diagnosis.

    Purpose of the Study:

    • To determine normal sinus node recovery time (SNRT) values in electrophysiologically normal children.
    • To assess the influence of pacing rates and autonomic tone on SNRT in children.

    Main Methods:

    • Overdrive atrial stimulation was performed in 20 children during cardiac catheterization.
    • SNRT was measured at pacing rates of 120, 150, 180, and 200 beats/min.
    • The effect of atropine on SNRT was evaluated.

    Main Results:

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    • Absolute SNRT values showed a wide range (420-1280 msec).
    • When expressed as a percentage of the resting P-P interval, values at 120 and 150 beats/min were 109-166%.
    • Faster pacing rates (180, 200 beats/min) resulted in significantly less overdrive suppression (P < 0.001). Atropine diminished maximum SNRT.

    Conclusions:

    • This study provides reference values for SNRT in children.
    • Factors influencing SNRT include resting heart rate, overdrive pacing rate, and autonomic tone.
    • Recommends expressing pediatric SNRT relative to the resting sinus interval for improved clinical utility.