Related Experiment Videos
Diagnosis of myocardial ischemia in hypertensive patients
E Picano1, A Pálinkás, R Amyot
1Istituto di Fisiologia Clinica, CNR, Pisa, Italy. picano@ifc.pi.cnr.it
Insights
Arterial hypertension impacts coronary flow reserve via epicardial coronary artery disease, left ventricular hypertrophy, and microvascular issues. Diagnostic markers must differentiate these conditions for effective treatment.
Area of Science:
- Cardiology
- Hypertension Research
- Diagnostic Imaging
Background:
- Arterial hypertension can reduce coronary flow reserve through multiple, non-exclusive mechanisms.
- These include epicardial coronary artery disease (CAD), left ventricular hypertrophy, and microvascular dysfunction.
- Different diagnostic approaches are necessary to identify these distinct pathological targets.
Purpose of the Study:
- To outline the mechanisms by which arterial hypertension affects coronary flow reserve.
- To differentiate the diagnostic markers for epicardial CAD, left ventricular hypertrophy, and microvascular disease in hypertensive patients.
- To guide the appropriate use of diagnostic testing for coronary artery disease in hypertension.
Main Methods:
- Review of mechanisms linking hypertension to reduced coronary flow reserve.
- Analysis of diagnostic specificity for stress-induced wall motion abnormalities (epicardial CAD) versus ST depression/perfusion abnormalities (LVH/microvascular disease).
- Evaluation of the role of exercise-electrocardiography stress testing and imaging stress echocardiography.
Main Results:
- Stress-induced wall motion abnormalities are specific for epicardial CAD.
- ST depression and perfusion abnormalities often indicate LVH and/or microvascular disease in normal epicardial arteries.
- Exercise-electrocardiography has a high negative predictive value, useful for screening.
- Imaging stress echocardiography is recommended for positive or ambiguous exercise tests to identify significant epicardial CAD.
Conclusions:
- Hypertension-induced coronary flow reduction involves diverse pathologies requiring tailored diagnostics.
- Exercise-electrocardiography is a valuable screening tool, especially for ruling out significant CAD.
- Imaging stress echocardiography is crucial for confirming epicardial CAD and guiding revascularization decisions in hypertensive patients.
Abstract:
Arterial hypertension can provoke a reduction in coronary flow reserve through several mechanisms that are not mutually exclusive (i.e. epicardial coronary artery disease (CAD), left ventricular hypertrophy and structural and/or functional microvascular disease). These different targets of arterial hypertension should be explored with different diagnostic markers. In fact, stress-induced wall motion abnormalities are highly specific for angiographically assessed epicardial CAD, whereas ST segment depression and/or myocardial perfusion abnormalities are frequently found with angiographically normal coronary arteries associated with left ventricular hypertrophy and/or microvascular disease. Exercise-electrocardiography stress test can be used to screen patients with negative maximal test due to its excellent negative predictive value, which is high and comparable in normotensives and hypertensives. When exercise-electrocardiography stress test is positive (or uninterpretable or ambiguous), an imaging stress-echo test is warranted for a reliable identification of significant, prognostically malignant epicardial CAD in view of an ischemia-guided revascularization.