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The predictive value of the time course of ST segment depression during exercise testing in patients referred for
M H Ellestad1, L Thomas, R Ong
1Memorial Heart Institute, Long Beach Memorial Medical Center, CA 90801-1428.
Insights
Analyzing the timing of ST segment depression during exercise tests reveals significant coronary artery disease. This detailed analysis of exercise stress tests improves diagnostic accuracy for heart conditions.
Area of Science:
- Cardiology
- Exercise Physiology
Background:
- Exercise stress testing is a common method for diagnosing coronary artery disease (CAD).
- ST segment depression during exercise is a key indicator of myocardial ischemia.
- The interpretation of ST segment depression patterns requires further refinement for improved diagnostic accuracy.
Purpose of the Study:
- To investigate the diagnostic value of the time course of ST segment depression during and after exercise testing in relation to coronary angiogram findings.
- To assess the correlation between specific ST depression patterns (onset, offset, and resting changes) and the severity of coronary artery disease.
Main Methods:
- Retrospective analysis of 462 subjects who underwent exercise testing and coronary angiography.
- Detailed evaluation of the time course of ST segment depression, including onset, offset, and resting changes.
- Correlation of ST depression patterns with the presence and severity of coronary artery disease (e.g., significant CAD, three-vessel disease).
Main Results:
- Patients with late onset-early offset ST depression, often considered false positives, showed significant CAD in 63% and three-vessel disease in 32%.
- Early onset and late offset ST depression, as well as exercise-accentuated resting ST depression, were associated with a high prevalence of significant and three-vessel CAD.
- The temporal dynamics of ST depression provide crucial information beyond the standard exercise test interpretation.
Conclusions:
- The time course of ST segment depression during and after exercise testing significantly enhances diagnostic information for coronary artery disease.
- Specific patterns of ST depression, including their onset and offset, are valuable indicators of significant coronary artery disease.
- Incorporating the temporal analysis of ST depression can improve the accuracy of exercise stress testing in identifying patients with significant CAD.
Abstract:
We studied the time course of ST segment depression during and after exercise testing in 462 subjects who also had coronary angiograms. Sixty-three percent of patients with late onset-early offset ST depression, previously reported to be likely to have false positive tests, had significant coronary artery disease, and 32% had three-vessel disease. Those with early onset and late offset ST depression and those with resting ST depression that was accentuated with exercise had a high prevalence of significant coronary artery disease and three-vessel disease. We found that observation of the time course of ST depression during and after exercise adds significantly to the information gained during exercise testing.