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Exercise-induced ST segment elevation. Electrocardiographic, angiographic, and scintigraphic evaluation
British Heart Journal
|May 1, 1980
Summary
ST segment elevation after myocardial infarction, particularly with QS complex, indicates severe left ventricular abnormalities. This finding may stem from mechanical issues rather than ischemia, suggesting a need for advanced cardiac imaging.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Exercise Physiology
Background:
- Myocardial infarction (MI) can lead to significant left ventricular (LV) dysfunction.
- Post-MI electrocardiogram (ECG) changes require careful interpretation to assess cardiac health.
Purpose of the Study:
- To investigate the significance of ST segment elevation in patients with previous myocardial infarction.
- To determine the underlying cardiac conditions associated with exercise-induced ST elevation in leads with QS configuration.
Main Methods:
- Computer-assisted 12-lead exercise electrocardiography in 215 patients post-MI.
- Serial thallium-201 scintigraphy, coronary arteriography, and left ventricular angiography for selected patients.
- Utilized esophageal leads for improved detection in specific cases.
Main Results:
- 17% of patients exhibited ST segment elevation over the infarct zone with QS configuration on exercise ECG.
- All investigated patients showed LV wall motion abnormalities.
- 89% were diagnosed with LV aneurysm (dyskinesia/akinesia).
- Esophageal leads detected ST elevation in a posterior aneurysm case.
Conclusions:
- Exercise-induced ST elevation in leads with QS configuration post-MI reflects severe LV wall motion abnormalities.
- The mechanism is likely mechanical, not solely reversible myocardial ischemia.
- Suggests advanced imaging is crucial for patients with these ECG findings.