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ST segment changes post-infarction: predictive value for multivessel coronary disease and left ventricular aneurysm
Insights
Exercise stress tests can predict multivessel coronary artery disease and left ventricular aneurysm after myocardial infarction. ST depression indicates multivessel disease, while ST elevation alone suggests single-vessel involvement.
Area of Science:
- Cardiology
- Exercise Physiology
- Diagnostic Testing
Background:
- Myocardial infarction (MI) survivors require accurate risk stratification.
- Exercise testing is a common non-invasive tool post-MI.
- Predicting multivessel coronary artery disease (CAD) and left ventricular aneurysm (LVA) is crucial for management.
Purpose of the Study:
- To determine if exercise testing can predict multivessel CAD and LVA in post-MI patients.
- To correlate specific electrocardiographic (ECG) changes during exercise with angiographic findings.
Main Methods:
- 154 post-MI patients underwent exercise testing and coronary angiography.
- Patients were grouped based on ST-segment depression or elevation during exercise.
- Multivessel CAD defined as ≥70% narrowing in ≥2 coronary vessels.
Main Results:
- ST depression (with or without ST elevation) strongly predicted multivessel CAD (76-91% prevalence).
- ST elevation alone or no ST changes indicated lower rates of multivessel CAD (13-21%).
- ST elevation (with or without ST depression) was associated with a higher incidence of LVA (68-79%).
Conclusions:
- Exercise testing reliably predicts multivessel CAD and LVA post-MI.
- ST depression patterns during exercise are key indicators of coronary artery disease extent.
- Specific ST-segment changes during exercise testing offer valuable prognostic information.
Abstract:
To ascertain whether exercise testing might predict multivessel coronary disease and left ventricular aneurysm after a myocardial infarction, 154 patients with a single documented myocardial infarction who had both exercise testing and coronary angiography were grouped according to whether they had greater than or equal to 1 mm ST depression, greater than or equal to 1 mm ST elevation, or neither during exercise testing: 83 patients developed ST depression alone (group 1); 22 patients had ST elevation with concomitant ST depression in other leads (group 2); 19 patients had ST elevation alone (group 3); and 30 patients had no ST changes (group 4). Multivessel disease, defined as greater than or equal to 70% luminal narrowing in two or more coronary vessels, was present in 76% (63 of 83) of group 1, 91% (20 of 22) of group 2, 21% (four of 19) of group 3, and 13% (four of 30) of group 4. A left ventricular aneurysm was present in 31% (26 of 83) of group 1, 68% (15 of 22) of group 2, 79% (15 of 19) of group 3, and 40% (12 to 30) of group 1. We conclude that ST changes during exercise testing in patients after a myocardial infarction can reliably predict the extent of coronary disease and the presence of a left ventricular aneurysm; ST depression with or without ST elevation predicts multivessel disease; ST elevation alone or a negative exercise test suggests single vessel involvement; and ST elevation with or without ST depression predicts left ventricular aneurysm.