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[Circadian variability of cardiac arrhythmias in patients with cardiovascular diseases]

S B Shustov, V A Iakovlev, V P Kitsyshin

    Vestnik Rossiiskoi Akademii Meditsinskikh Nauk
    |October 7, 2000
    PubMed

    Insights

    Cardiovascular disease patients exhibit daily patterns in arrhythmias, with higher risks in the morning. Understanding these circadian rhythms is crucial for managing heart conditions and preventing adverse events.

    Area of Science:

    • Cardiology
    • Chronobiology
    • Medical Monitoring

    Background:

    • Cardiovascular diseases are a leading cause of mortality worldwide.
    • Arrhythmias and conduction disturbances are common complications in patients with heart conditions.
    • Circadian variations in physiological processes can influence cardiovascular events.

    Purpose of the Study:

    • To analyze the circadian rhythm of arrhythmias in patients with cardiovascular diseases.
    • To identify the main factors influencing the diurnal pattern of cardiac arrhythmias.
    • To determine the most unfavorable periods for arrhythmia occurrence.

    Main Methods:

    • Analysis of 1063 Holter monitoring results from patients with cardiovascular diseases.
    • Statistical evaluation of arrhythmia occurrence in relation to time of day.
    • Identification of influencing factors such as sleep-wake cycles and disease severity.

    Main Results:

    • A distinct circadian rhythm of arrhythmias was observed, with lower rates at night and higher rates during the day, peaking in the morning.
    • Conduction disturbances were notably increased during sleep and early morning hours.
    • The specific rhythm profile varied based on arrhythmia type and cardiac disease pattern.

    Conclusions:

    • The early morning, pre-awakening, and post-awakening periods represent the most critical times for arrhythmia disturbances in cardiovascular patients.
    • Circadian variations in sympathetic tone, myocardial oxygen demand, and blood pressure significantly contribute to arrhythmia patterns.
    • These findings highlight the importance of considering diurnal rhythms in the management and monitoring of cardiovascular diseases.

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