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Autonomic nervous system activity in idiopathic dilated cardiomyopathy and in hypertrophic cardiomyopathy

K Ajiki1, Y Murakawa, A Yanagisawa-Miwa

  • 12nd Department of Internal Medicine, Tokyo University Hospital, Japan.

The American Journal of Cardiology
|June 1, 1993
PubMed

Insights

Autonomic nervous system imbalance, marked by reduced parasympathetic and increased sympathetic activity, is evident in patients with cardiomyopathies. Heart rate variability analysis reveals these changes, aiding in understanding disease pathophysiology.

Area of Science:

  • Cardiology
  • Autonomic Neuroscience

Background:

  • Cardiomyopathies are characterized by structural and functional abnormalities of the heart muscle.
  • Autonomic nervous system dysfunction is increasingly recognized as a contributing factor in cardiovascular diseases.

Purpose of the Study:

  • To evaluate autonomic nervous system activity in patients with idiopathic dilated cardiomyopathy (IDC) and hypertrophic cardiomyopathy (HC).
  • To correlate heart rate variability (HRV) findings with disease characteristics.

Main Methods:

  • 24-hour ambulatory electrocardiograms were used to analyze heart rate variability.
  • Fast-Fourier transform was applied to quantify power spectra in low-frequency (LF) and high-frequency (HF) bands.
  • Log(HF) and Log(LF/HF) were used as indices for parasympathetic and sympathetic activity, respectively.

Main Results:

  • Patients with IDC showed significantly lower parasympathetic activity (Log(HF)) and higher sympathetic activity (Log(LF/HF)), related to ejection fraction.
  • Patients with HC exhibited reduced parasympathetic and enhanced sympathetic activity primarily during nighttime, independent of hypertrophy severity.

Conclusions:

  • Cardiomyopathies are associated with significant autonomic nervous system imbalance.
  • HRV analysis is a valuable tool for assessing autonomic dysfunction in cardiomyopathies and understanding their pathophysiology.

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