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Chronotropic incompetence in exercise testing.

C F Chin, J C Messenger, P S Greenberg

    Clinical Cardiology
    |February 1, 1979
    PubMed
    Summary
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    Chronotropic incompetence, a blunted heart rate response during exercise, often indicates significant coronary heart disease, even without ST segment changes. Autonomic dysfunction may underlie this condition, highlighting its importance in cardiac risk assessment.

    Area of Science:

    • Cardiology
    • Exercise Physiology
    • Autonomic Nervous System

    Background:

    • Chronotropic incompetence (CI) is defined as an inadequate heart rate increase during exercise.
    • Coronary artery disease (CAD) is a leading cause of cardiovascular morbidity and mortality.
    • Exercise testing is a common diagnostic tool for CAD, typically evaluating ST segment changes.

    Purpose of the Study:

    • To investigate the prevalence and significance of CI in patients with and without known coronary artery disease.
    • To compare the diagnostic implications of CI with ST segment depression during exercise testing.
    • To explore potential pathophysiological mechanisms underlying CI.

    Main Methods:

    • Patients with CI were identified based on a heart rate response within two standard deviations of the expected increase during exercise.

    Related Experiment Videos

  • These patients were compared to individuals with angiographically confirmed CAD, with and without ST segment depression.
  • Intrinsic heart rate was measured to assess autonomic function.

    • Main Results:

    • A significant proportion (72%) of patients with CI but without ST depression had underlying coronary heart disease.
    • CI demonstrated predictive value comparable to ST segment changes in identifying significant CAD.
    • No evidence of sinoatrial (SA) node ischemia was found; autonomic dysfunction was suggested as a mechanism.

    Conclusions:

    • Chronotropic incompetence is a crucial indicator of coronary heart disease, regardless of ST segment changes.
    • Exercise testing protocols should incorporate predicted heart rate response with standard deviations for age and sex.
    • Autonomic dysfunction is a potential cause of CI, warranting further investigation.