Perfusion Imaging
Perfusion imaging may be done in conjunction with an exercise test, in order to evaluate the amount of healthy and functioning heart tissue.
During this test, intravenous injections of a radioactive tracer, (either thallium or technetium) are given to produce images of the heart muscle. This is followed by scanning, using a specialized camera and computer system. The scans will be performed while you are at rest and again after you have completed a short period of strenuous exercise. This scanning period may last 40 minutes. Scans will be compared to search for areas of the heart tissue that do not receive enough blood either at rest or during increased demands.
Preparation for the scan is similar to that described for the exercise studies, but in addition, an intravenous line will be placed to use for injection of the radioactive tracer. You will be asked to change into a hospital gown; women will be asked to remove their bras.
Pharmacologic Stress Test/Imaging
If you are unable to perform a walking exercise test on a treadmill, medication (dobutamine, adenosine, or dipyridamole) may be injected intravenously to increase the demands on your heart, in order to study the heart’s function at rest and during times when demands are increased. You may feel flushed, or experience chest pressure, dizziness, nausea, or shortness of breath as the medication is given. This type of procedure may be done together with a perfusion scan. Follow the preparation guidelines listed for exercise testing.
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