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Illustrations
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Alternative names
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Definition
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How the test is performed
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How to prepare for the test
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How the test will feel
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Why the test is performed
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Normal Values
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What abnormal results mean
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What the risks are
Illustrations
Heart, front view
MUGA test
Alternative names
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Cardiac blood pooling imaging; Heart scan - nuclear; Radionuclide ventriculography (RNV); Multiple gate acquisition scan (MUGA)
Definition
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Nuclear ventriculography is a test that uses radioactive materials called tracers to make heart chambers and blood vessels visible. The procedure is non-invasive. The heart structures are not touched by instruments.
How the test is performed
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A radioactive isotope called technetium is injected into your vein. Radioactive isotopes attach to red blood cells and pass through the heart in the circulating blood. The radioactive isotope can be traced through the heart using special cameras or scanners. The images may be combined with an electrocardiogram.
You will be tested when you are resting, then tested again with exercise or after you take certain medications.
How to prepare for the test
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You may beВ told not to eat or drinkВ beverages containing caffeine or alcohol for several hours before the test.
How the test will feel
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You may feel a brief sting or pinch when the IV is inserted. You may have trouble staying still during the test.
Why the test is performed
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The test will show how well the blood is pumping through the heart, and will check for clogged arteries.
Normal Values
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Normal results indicate normal heart function, or a normal cardiac response to exercise.
What abnormal results mean
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Abnormal results may indicate poor pumping function, a prior heart attack (myocardial infarction), blockages in the coronary arteries (coronary artery disease), heart valve disease, or other cardiac disorders associated with weakening of the heart function.
Additional conditions under which the test may be performed:
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Atrial septal defect
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Dilated cardiomyopathy
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Heart failure
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Idiopathic cardiomyopathy
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Mitral stenosis
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Peripartum cardiomyopathy
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Senile cardiac amyloid
What the risks are
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Nuclear imaging tests carry a very low risk of complications. Exposure to the radioisotope is safe for patients undergoing an occasional nuclear imaging test.
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