Radionuclide Ventriculography (Multiple-Gated Acquisition Scanning)
The scan allows your doctor to check how well your heart pumps blood. The results can help your doctor learn more about why you may be having chest pain, trouble breathing, dizziness or fatigue. The scan may take up to two or three hours to complete. You can return to your normal activities after the test.
What happens during the test?
During the test, you wear small patches (electrodes) on your chest. The technician injects a small amount of radioactive substance (a radionuclide) into your blood. The substance is like a dye. It attaches to your red blood cells and makes it easier to see how your blood moves through your heart. Your technician places a special gamma camera above your chest. This camera takes pictures of your heart during each heartbeat. Your doctor sees the blood inside your ventricles as it pumps out. A computer analyzes these pictures. The pictures show if there are areas of your heart muscle that are not contracting normally.
This test may be done while you stay still. You may also be asked to exercise between pictures. This tells your doctor how well your heart responds to the stress of exercise.
What does the test show?
The test measures the amount of blood your heart pumps out during each heartbeat. This is called the ejection fraction. A normal ejection fraction is between 50 and 75 percent.
If your result is less than 50 percent, it may mean you have a cardiac disorder such as coronary artery disease, valvular heart disease, congenital heart defects or cardiomyopathy.
Your doctor will talk with you about the results of your test.