What does thallium scanning assess regarding the heart?

What does thallium scanning assess regarding the heart?

• A. It monitors action of the heart valves.
• B. It assesses myocardial ischemia and perfusion.
• C. It visualizes ventricular systole and diastole.
• D. It identifies the adequacy of the conduction system.

Answer: (B)

Thallium scanning assesses myocardial perfusion and ischemia. Thallium-201 is taken up by viable myocardial cells in proportion to blood flow, so imaging after stress (exercise or pharmacologic) reveals areas with reduced perfusion as defects. If those defects disappear or fill in on rest or redistribution images, the tissue is viable and the problem is reversible ischemia; persistent defects suggest scar tissue. This test helps identify coronary artery disease and regional perfusion status, whereas it does not directly measure valve function, visualize ventricular systole/diastole, or assess conduction system integrity.

Thallium scanning assesses myocardial perfusion and ischemia. Thallium-201 is taken up by viable myocardial cells in proportion to blood flow, so imaging after stress (exercise or pharmacologic) reveals areas with reduced perfusion as defects. If those defects disappear or fill in on rest or redistribution images, the tissue is viable and the problem is reversible ischemia; persistent defects suggest scar tissue. This test helps identify coronary artery disease and regional perfusion status, whereas it does not directly measure valve function, visualize ventricular systole/diastole, or assess conduction system integrity.