Left ventricular performance during exercise testing in patients with silent and symptomatic myocardial ischemia

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Myocardial Infarction and Functional Outcome Assessment in Pigs
12:03

Myocardial Infarction and Functional Outcome Assessment in Pigs

Published on: April 25, 2014

K Matsubara1, M Yokota, T Miyahara

  • 1First Department of Internal Medicine, Nagoya University School of Medicine, Japan.

American Heart Journal
|March 1, 1995
PubMed

Insights

Patients with silent myocardial ischemia show less severe exercise-induced left ventricular dysfunction compared to those with symptomatic ischemia. This finding impacts understanding of coronary artery disease progression.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Clinical Medicine

Background:

  • Exercise-induced myocardial ischemia is a critical indicator of coronary artery disease (CAD).
  • Patients with CAD can experience ischemia with or without symptoms like chest pain.
  • Left ventricular dysfunction during exercise is a key concern in managing CAD.

Purpose of the Study:

  • To compare the cardiohemodynamic response to dynamic exercise in patients with silent versus symptomatic myocardial ischemia.
  • To investigate differences in exercise-induced left ventricular dysfunction between these patient groups.

Main Methods:

  • 32 patients with coronary artery disease and exercise-induced ST-segment depression were studied.
  • Patients underwent supine leg-exercise testing with right heart catheterization.
  • Patients were divided into silent (Group 1, n=10) and symptomatic (Group 2, n=22) ischemia groups based on chest pain presence.

Main Results:

  • No significant difference in peak ST-segment depression magnitude between groups.
  • Group 1 (silent ischemia) had significantly lower pulmonary artery wedge pressure at peak exercise (p < 0.01).
  • Group 1 (silent ischemia) exhibited a significantly higher cardiac index at peak exercise (p < 0.01) compared to Group 2.

Conclusions:

  • Exercise-induced left ventricular dysfunction is less severe in patients with silent myocardial ischemia.
  • Cardiohemodynamic responses during exercise differ between silent and symptomatic ischemia.
  • These findings suggest distinct pathophysiological mechanisms or compensatory strategies in silent ischemia.

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