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Myocardial Infarction and Functional Outcome Assessment in Pigs
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Long-term outcome of patients with chronotropic incompetence after an acute myocardial infarction

Antti M Kiviniemi1, Mikko P Tulppo, Arto J Hautala

  • 1Department of Exercise and Medical Physiology, Verve Research, Oulu, Finland. Antti.Kiviniemi@verve.fi

Annals of Medicine
|October 28, 2010
PubMed

Insights

Chronotropic incompetence, a measure of heart rate response to exercise, is a strong predictor of cardiac death in patients after a myocardial infarction (MI). This finding aids in risk stratification for post-MI mortality.

Area of Science:

  • Cardiology
  • Clinical Medicine
  • Exercise Physiology

Background:

  • Chronotropic incompetence is a known mortality risk marker in general populations.
  • Its predictive value in patients post-myocardial infarction (MI) remains unestablished.
  • Risk stratification is crucial for managing post-MI patients.

Purpose of the Study:

  • To investigate the prognostic value of chronotropic incompetence in patients with recent MI.
  • To determine if chronotropic incompetence predicts cardiac death and sudden cardiac death (SCD) in this cohort.
  • To compare its predictive power against established markers like left ventricular ejection fraction (LVEF).

Main Methods:

  • A cohort of 494 patients with recent MI underwent exercise testing and echocardiography.
  • Maximal chronotropic response index (CRI) was calculated to assess heart rate response to exercise.
  • Cardiac death and SCD were tracked over an 8-year follow-up period.

Main Results:

  • Abnormal CRI (<39) was the strongest predictor of cardiac death (adjusted RR 5.4) and SCD (adjusted RR 7.3).
  • Decreased LVEF (<45%) also predicted cardiac death (adjusted RR 3.4).
  • Excluding CRI from the predictive model significantly reduced its accuracy (c-index decreased from 0.817 to 0.778).

Conclusions:

  • Chronotropic incompetence is a powerful and independent predictor of cardiac mortality in post-MI patients.
  • CRI offers significant value in risk stratification beyond traditional markers like LVEF.
  • This highlights the importance of assessing heart rate response to exercise in MI survivors.
Abstract

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