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Accurate detection of triple vessel disease in patients with exercise induced ST segment depression after infarction
Insights
Exercise stress tests can predict severe coronary artery disease after heart attack. Specific ECG and blood pressure changes during exercise accurately identify triple vessel disease, aiding prognosis.
Area of Science:
- Cardiology
- Diagnostic Medicine
- Clinical Exercise Physiology
Background:
- Coronary artery disease (CAD) severity impacts prognosis post-acute myocardial infarction (AMI).
- Symptom-limited exercise testing is a common tool for assessing cardiac function after AMI.
Purpose of the Study:
- To evaluate the predictive value of exercise stress testing for detecting triple vessel disease (TVD) in patients post-MI.
- To identify specific electrocardiographic (ECG) and hemodynamic features indicative of TVD.
Main Methods:
- A cohort of 221 patients underwent symptom-limited exercise testing three weeks after AMI.
- Coronary angiography was performed for patients exhibiting exercise-induced ST-segment depression.
- Analysis focused on ST-segment configurations, onset/recovery times, and blood pressure response.
Main Results:
- ST-segment depression alone had limited predictive value for TVD.
- Specific ST-segment patterns (downsloping or horizontal with early onset/late recovery) combined with abnormal blood pressure response accurately identified 90% of TVD cases.
- These criteria correctly identified 85% of patients without TVD (single/double vessel disease).
Conclusions:
- Exercise stress testing, particularly specific ECG findings and hemodynamic responses, can accurately detect triple vessel disease in post-MI patients.
- This non-invasive assessment aids in determining prognosis and guiding further management strategies.
Abstract:
The severity of coronary artery disease is an important determinant of prognosis after acute myocardial infarction. The ability of a symptom limited exercise test to predict the presence of triple vessel disease was assessed in 221 patients three weeks after infarction. Coronary angiography was performed in patients with exercise induced ST segment depression. The presence of ST segment depression alone was poorly indicative of triple vessel disease; however, some specific features of ST segment changes on exercise were of predictive value. Downsloping ST segment configuration alone or horizontal ST segment depression associated with an early onset and a late recovery time after exercise correctly identified 30 (90%) of 33 patients with triple vessel disease whereas it incorrectly identified only 6 (15%) of 39 patients with single and double vessel disease. An abnormal blood pressure response was also predictive. In patients with ST segment depression after infarction triple vessel disease can be detected accurately by a combination of the electrocardiographic and haemodynamic variables attained on exercise.