A radionuclide ventriculogram (RVG) measures the pumping ability of your heart. It uses a camera to trace a small radioactive substance, which is called isotope, in your bloodstream. This test is also called a multi-gated acquisition (MUGA) scan.

What does it tell the doctor?
This test tells your doctor how well your heart pumps. It gives your doctor the percentage of blood your heart empties into your body. Also, it shows your doctor if areas of your heart muscle are not contracting (pumping) well.

What happens before the test?
There is no advance preparation for this test.

What will I experience?
A medical professional will draw a small amount of blood from your vein (intravenously or IV). The blood will be mixed with a radioactive isotope. About 30 minutes later, it will be returned into your bloodstream through the same IV. During the test, you will lie flat with your left arm above your head for about 15-20 minutes. A scanner (camera) rotates around your chest to take pictures of your heart.