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Diagnosing coronary artery disease in patients with hypertension: a resolved dilemma?
1Department of Cardiology and Cardiovascular Sciences, Hospital San Raffaele, Milan, Italy. fragasso.gabriele@hsr.it
Insights
For hypertension patients with chest pain, stress echocardiography is more accurate than perfusion scintigraphy for detecting coronary artery disease. This helps differentiate true disease from other causes of abnormal heart tests.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Hypertension Management
Background:
- Hypertension often causes chest pain and abnormal exercise electrocardiograms (ECGs).
- These ECG changes have low specificity for coronary artery disease (CAD) in hypertensive patients, often showing normal coronary angiograms.
- Non-invasive diagnostic tests are crucial for accurate CAD assessment in this population.
Purpose of the Study:
- To review diagnostic tests for identifying significant epicardial coronary artery disease (CAD) in hypertensive patients.
- To compare the diagnostic accuracy of stress echocardiography versus perfusion scintigraphy.
- To understand the limitations of myocardial scintigraphy in this clinical setting.
Main Methods:
- Systematic review of relevant literature on diagnostic tests for CAD in hypertension.
- Comparative analysis of stress echocardiography and perfusion scintigraphy performance.
- Evaluation of factors contributing to low specificity in myocardial scintigraphy.
Main Results:
- Stress echocardiography demonstrates superior diagnostic accuracy compared to perfusion scintigraphy for identifying epicardial CAD in hypertensive patients.
- Myocardial scintigraphy's lower specificity may stem from detecting perfusion abnormalities not solely due to epicardial CAD, potentially related to microvascular disease.
Conclusions:
- Stress echocardiography is a more reliable non-invasive test for diagnosing significant epicardial CAD in hypertensive patients.
- Perfusion scintigraphy's limitations in specificity highlight the need for careful interpretation in the context of potential microvascular dysfunction.
Abstract:
Patients with hypertension frequently complain of chest pain and exhibit ischemic-like ST segment changes on exercise electrocardiogram. However, the specificity of such changes for predicting significant coronary artery disease is very low, since these patients often exhibit a normal coronary angiogram. Several alternative non-invasive tests have been proposed and, recently, the relative performance of the available techniques has been systematically assessed. The purpose of this article is to review the relevant literature on the diagnostic tests employed in the clinical setting. Recent evidence suggests that stress echocardiography yields a better diagnostic accuracy than perfusion scintigraphy in identifying significant epicardial coronary artery disease in patients with hypertension. The low specificity of myocardial scintigraphy probably relates to the fact that this method traces perfusion abnormalities, not necessarily caused by epicardial coronary artery disease, possibly due to microvascular disease, and not axiomatically causing obvious wall motion abnormalities.