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Chronotropic incompetence and a higher frequency of myocardial ischemia in exercise echocardiography

Joselina L M Oliveira1, Thiago J S Góes, Thaiana A Santana

  • 1Department of Internal Medicine, Cardiology Division, Federal University of Sergipe, Aracaju, Sergipe, Brazil. joselinasergipe@ig.com.br

Cardiovascular Ultrasound
|November 6, 2007
PubMed

Insights

Chronotropic incompetence (CI) during exercise echocardiography (EE) is linked to more frequent myocardial ischemia and severe coronary artery disease (CAD). This finding highlights CI as a significant indicator of ischemia severity in CAD diagnosis.

Area of Science:

  • Cardiology
  • Diagnostic Imaging
  • Exercise Physiology

Background:

  • Exercise echocardiography (EE) is a standard diagnostic tool for coronary artery disease (CAD).
  • Chronotropic incompetence (CI), a reduced heart rate response during exercise, is a potential indicator of myocardial ischemia.
  • This study investigates the additional diagnostic value of CI in EE for CAD.

Purpose of the Study:

  • To determine if chronotropic incompetence (CI) during exercise echocardiography (EE) provides additive value in diagnosing coronary artery disease (CAD).
  • To assess the association between CI and myocardial ischemia during EE.
  • To evaluate CI as a marker for the severity of myocardial ischemia.

Main Methods:

  • 4042 patients underwent EE between 2000 and 2006.
  • Patients were divided into two groups based on achieving 85% of maximal age-predicted heart rate (HR): G1 (failed to achieve) and G2 (achieved).
  • Comparison included clinical characteristics, left ventricular wall motion abnormalities (WMSI), and coronary angiography (CA) results.

Main Results:

  • Left ventricular wall motion abnormalities were significantly more frequent in the G1 group (54%) compared to the G2 group (26%).
  • WMSI was higher at rest and post-exercise in the G1 group.
  • 82% of G1 patients with positive EE for ischemia had obstructive CAD, versus 71% in G2.

Conclusions:

  • Chronotropic incompetence (CI) during EE is associated with a higher incidence of myocardial ischemia.
  • CI serves as a marker for the severity of myocardial ischemia in patients undergoing EE.
  • The findings support the role of CI in enhancing CAD diagnosis through EE.
Abstract

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