What is the role of nuclear imaging studies in the workup of coronary artery atherosclerosis?

Updated: Apr 09, 2021
  • Author: Sandy N Shah, DO, MBA, FACC, FACP, FACOI; Chief Editor: Yasmine S Ali, MD, MSCI, FACC, FACP  more...
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Answer

These studies are useful in assessing patients for hemodynamically significant coronary artery stenoses. Stress and rest nuclear scintigraphic studies using thallium, sestamibi, or teboroxime are sometimes helpful.

Types of nuclear imaging stress tests include a treadmill nuclear stress test, a dipyridamole (Persantine) or adenosine nuclear stress test, and a dobutamine nuclear stress test. Stress nuclear imaging findings are depicted below.

Coronary Artery Atherosclerosis. Stress nuclear im Coronary Artery Atherosclerosis. Stress nuclear imaging showing anterior, apical, and septal wall perfusion defects during stress, which are reversible as observed on the rest images. These defects strongly suggest the presence of significant stenosis in the left anterior descending coronary artery.

Radionuclide stress myocardial perfusion imaging can be used to quantify CFR. Thallium-201 (201 Tl) or sestamibi are widely used for this. Flow reserve is typically assessed during exercise or with pharmacologic coronary vasodilators.

MI-avid scintigraphy may be indicated for detection and localization of infarcted myocardium if evidence from other tests is inconclusive.


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