This test is performed with an isotope (thallium, sestamibi, or a combination of the two). The test is performed in conjunction with a treadmill exercise test.
Myocardial perfusion imaging is performed:
- When the results of a routine treadmill study are equivocal.
- When there is known coronary artery occlusive disease and it is desirable to know the extent and severity of the disease (so-called risk stratification).
- In some patients, to determine the functional significance of coronary blockage observed on an angiogram.
- To determine if coronary disease is the cause of, or associated with, abnormalities on the resting electrocardiogram.
- To evaluate the results of coronary bypass surgery or coronary balloon angioplasty (PTCA)
Myocardial perfusion imaging is a non-invasive test and carries no risk beyond that of the treadmill testing itself. The radioactive isotope injected for the study produces less radiation than x-ray procedures such as a CAT scan and is non-allergenic.
Procedure
The heart is imaged both at rest and during exercise. The exercise portion of the test is similar to that described in treadmill testing. The isotope tracer is injected into an arm vein one minute before you stop walking. After the termination of the treadmill test the isotope will be imaged in the heart area by a large camera. This imaging will take 20 to 25 minutes during which time you will be asked to lie on a bed with your arms over your head. You are asked not to move during the imaging.
Preparation for the Test
Do not eat or drink anything except water for three hours before the test. Please consult your doctor regarding whether you should take your medications. Please inform your doctor if there is a possibility that you are pregnant.
After the Test
The results of the test are not usually available immediately, and your doctor will go over the findings with you at a subsequent visit.
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