Thallium and Sestamibi Stress Tests
Alternate Names : MIBI Stress Test, Sestamibi and Thallium Stress Tests
Definition
Thallium and sestamibi stress tests are nuclear imaging methods that provide a view of the blood flow into the heart muscle. The thallium and sestamibi tests are also called MIBI stress test and myocardial perfusion scintigraphy, and are used to evaluate how well your heart is perfused (supplied with blood) at rest as compared with activity.
During these tests, heart images can be obtained because the patient receives an injection of a substance that is labeled with a radioactive marker or radiotracer to make it visible in the bloodstream. These substances are also called radiopharmaceuticals, and include thallium-201 and technetium-99m MIBI or sestamibi.
In comparison to the standard treadmill stress test, thallium and sestamibi stress tests are more accurate and provide additional information.
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Why is the Test Performed?
The thallium and sestamibi stress tests are indicated when your doctor needs to evaluate for example:
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how well your heart responds to exercise
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the degree of blockage in your coronary arteries
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how well a heart procedure done to improve blood flow in your coronary arteries is working
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