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The predictive value of a strongly positive stress test in patients with minimal symptoms
Insights
A strongly positive stress test can predict left main coronary artery disease (LMCA) even in patients with minimal angina. Anterior and inferior electrocardiographic changes during exercise were most predictive of LMCA disease.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Left main coronary artery disease (LMCA) is a critical condition.
- Predicting LMCA in patients with minimal or no symptoms is challenging.
- Standard stress electrocardiography criteria may not be optimal for this population.
Purpose of the Study:
- To evaluate the predictive ability of a strongly positive stress test for LMCA disease.
- To assess the utility of exercise electrocardiography in patients with suspected coronary artery disease (CAD) and minimal symptoms.
Main Methods:
- Studied 40 patients with suspected CAD and minimal/no angina.
- Analyzed stress electrocardiograms using established LMCA criteria.
- Assessed prevalence of LMCA and severe CAD.
Main Results:
- Prevalence of LMCA disease was 35%; severe CAD was 75%.
- Anterior and inferior electrocardiographic changes during exercise strongly predicted LMCA disease (P < 0.01).
- Other criteria included S-T segment changes, hypotension, and prolonged recovery.
Conclusions:
- Exercise electrocardiography is valuable for predicting LMCA and severe CAD in patients with minimal angina or post-myocardial infarction symptoms.
- Specific electrocardiographic patterns during exercise are key predictors.
Abstract:
The ability of a strongly positive stress test to predict left main coronary artery disease in people with suspected coronary artery disease but with minimal or no angina was investigated in 40 such patients. Nine had a history of myocardial infarction but no angina. Thirty-one had mild angina or a history of mild angina. The stress electrocardiograms were analyzed according to criteria known to be associated with left main coronary artery disease in moderately or severely symptomatic patients; (1) early S-T segment changes (stage I or II of exercise), (2) 2 mm or more S-T segment depression, (3) downsloping S-T segments, (4) associated exercise-induced hypotension, (5) prolonged S-T segment changes after the test (greater than or equal to 8 minutes) and (6) anterior and inferior S-T segment depression. The prevalence of left main coronary artery disease was 35 percent and that of any severe coronary artery disease 75 percent. The criterion of anterior and inferior electrocardiographic changes with exercise was most predictive of left main coronary artery disease (P less than 0.01 by chi 2). Exercise electrocardiography is useful in the prediction of left main or other severe coronary artery disease even when performed in patients who have minimal angina or in those who are asymptomatic after myocardial infarction.