vasodilator stress testing
Cardiac stress test using medications to dilate coronary arteries instead of exercise.
Full Definition
Vasodilator stress testing is a pharmacological method of cardiac stress testing that uses medications such as adenosine, dipyridamole, or regadenoson to dilate coronary arteries and increase coronary blood flow. This technique is employed when patients cannot achieve adequate exercise stress due to physical limitations, medications, or other contraindications. The vasodilators create a relative coronary steal phenomenon, where areas supplied by stenotic vessels receive less flow increase compared to normal vessels, allowing detection of coronary artery disease through nuclear perfusion imaging, echocardiography, or cardiac MRI. This method is particularly valuable for elderly patients and those with orthopedic or pulmonary limitations.
Usage
Usage note: Specify the vasodilator agent used; distinguish from inotropic stress testing.
In Context
- "Due to severe arthritis, the patient underwent vasodilator stress testing with adenosine." — Test selection
- "Vasodilator stress testing revealed reversible perfusion defects in the LAD territory." — Test results