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Cardiac autonomic function and incident coronary heart disease: a population-based case-cohort study. The ARIC Study.

D Liao1, J Cai, W D Rosamond

  • 1Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill 27514, USA.

American Journal of Epidemiology
|April 15, 1997
PubMed

Insights

Reduced cardiac autonomic activity, particularly lower parasympathetic function, is linked to an increased risk of developing coronary heart disease (CHD). This finding highlights HRV as a potential indicator for CHD incidence.

Area of Science:

  • Cardiology
  • Autonomic Nervous System Research
  • Public Health

Background:

  • Cardiac autonomic activity, measured by heart rate variability (HRV), is known to predict mortality post-myocardial infarction and all-cause mortality.
  • The relationship between HRV and the incidence of coronary heart disease (CHD) requires further elucidation.

Purpose of the Study:

  • To investigate the association between baseline cardiac autonomic activity and the incidence of CHD over a 3-year follow-up period.
  • To determine if HRV indices predict new-onset CHD in a general population cohort.

Main Methods:

  • A case-cohort design was employed using data from the Atherosclerosis Risk in Communities Study.
  • 137 incident CHD cases and 2,252 participants without CHD at baseline were analyzed.
  • Conventional HRV indices, including high-frequency power, low-frequency power, and their ratio, were calculated from spectral and time-domain analyses.

Main Results:

  • Lower high-frequency power (indicating reduced parasympathetic activity) was significantly associated with an increased risk of incident CHD (RR 1.72, 95% CI 1.17-2.51).
  • Low-frequency power, high-/low-frequency ratio, and standard deviation of R-R intervals showed non-significant associations with incident CHD in adjusted analyses.
  • These findings suggest a specific role for parasympathetic dysfunction in CHD development.

Conclusions:

  • Altered cardiac autonomic activity, specifically diminished parasympathetic function, is associated with an elevated risk of developing coronary heart disease.
  • HRV analysis may serve as a valuable tool for identifying individuals at risk for incident CHD.

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