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Ventricular parasystole: a chronobiologic study.

G A Lanza, M Lucente, A G Rebuzzi

    Pacing and Clinical Electrophysiology : PACE
    |November 1, 1986
    PubMed
    Summary
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    This study found that ventricular parasystole (VP) exhibits a circadian rhythm, similar to the heart

    Area of Science:

    • Cardiovascular Physiology
    • Chronobiology
    • Electrophysiology

    Background:

    • Circadian rhythms influence various cardiovascular parameters.
    • Ventricular parasystole (VP) is a cardiac arrhythmia.
    • The chronotropic activity of cardiac pacemakers is typically circadian.

    Purpose of the Study:

    • To investigate if the chronotropic activity of parasystolic foci in ventricular parasystole (VP) exhibits a circadian rhythm.
    • To compare the circadian rhythm of parasystolic rates (PRs) with heart rates (HRs).

    Main Methods:

    • 24-hour ECG Holter monitoring was conducted in seven patients with VP.
    • Hourly parasystolic rates (PRs) and heart rates (HRs) were calculated.
    • Chronobiologic analysis using single and mean cosinor methods was performed.

    Related Experiment Videos

  • Pearson's correlation coefficient assessed the relationship between mean hourly PR and HR.

    • Main Results:

    • Statistically significant circadian rhythms (P < 0.05) were found for both HR and PR.
    • HR showed an acrophase at 1:27 PM, mesor of 73.28 beats/min, and amplitude of 9.53 beats/min.
    • PR exhibited an acrophase at 1:42 PM, mesor of 38.31 beats/min, and amplitude of 3.64 beats/min.
    • A strong positive correlation (r = 0.96, P < 0.001) was observed between mean hourly HR and PR.

    Conclusions:

    • The chronotropic activity of parasystolic foci demonstrates a circadian variability similar to that of the sinus node.
    • This similarity suggests potential responsiveness of parasystolic foci to circadian variations in autonomic nervous system tone and/or circulating substances like catecholamines.