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Heart rate variability and left ventricular dilatation early after myocardial infarction

T Nishiue1, H Tsuji, N Tarumi

  • 1Cardiovascular Center, Kansai Medical University, Moriguchi-city, Osaka, Japan.

Journal of Electrocardiology
|August 28, 1999
PubMed

Insights

Autonomic tone alterations, specifically higher low-frequency (LF) and total power (TP) of heart rate variability, were found to precede early left ventricular dilatation in patients post-myocardial infarction.

Area of Science:

  • Cardiology
  • Autonomic Nervous System Research
  • Clinical Medicine

Background:

  • Left ventricular dilatation post-myocardial infarction (MI) is a significant predictor of adverse outcomes.
  • Understanding early predictors of left ventricular remodeling is crucial for timely intervention.
  • Autonomic dysfunction is increasingly recognized as a factor in cardiovascular disease progression.

Purpose of the Study:

  • To investigate whether changes in autonomic tone precede the development of early left ventricular dilatation after a first myocardial infarction.
  • To identify specific heart rate variability (HRV) parameters associated with subsequent left ventricular remodeling.

Main Methods:

  • Prospective observational study involving 53 patients after their first acute myocardial infarction.
  • Ambulatory electrocardiogram was used on day 1 to assess heart rate variability (HRV) parameters: low-frequency power (LF), high-frequency power (HF), and total power (TP).
  • Left ventricular end-diastolic volume was measured by echocardiography on day 1 and day 14. Stepwise linear regression analysis was employed for statistical assessment.

Main Results:

  • Higher levels of low-frequency power (LF) and total power (TP) were significantly associated with early left ventricular dilatation.
  • These associations remained significant after adjusting for multiple clinical variables including age, sex, MI location, revascularization, peak creatine kinase, hypertension history, and medications (ACE inhibitors, beta-blockers).
  • The findings indicate that specific HRV parameters indicative of autonomic tone precede left ventricular dilatation.

Conclusions:

  • Alterations in autonomic tone, particularly increased sympathetic modulation reflected by higher LF and TP, precede early left ventricular dilatation after myocardial infarction.
  • HRV analysis, specifically LF and TP, may serve as an early clinical marker for identifying patients at risk of adverse left ventricular remodeling post-MI.
  • These findings highlight the clinical relevance of assessing autonomic function in the early management of myocardial infarction patients.

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