Nuclear ventriculography is a test that uses radioactive materials called tracers to show the heart chambers. The procedure is noninvasive. The instruments do not directly touch the heart.
Cardiac blood pooling imaging; Heart scan - nuclear; Radionuclide ventriculography (RNV); Multiple gate acquisition scan (MUGA); Nuclear cardiology
How the Test is Performed
The test is done while you are resting.
The health care provider will inject a radioactive material called technetium into your vein. This substance attaches to red blood cells and passes through the heart.
The red blood cells inside the heart that carry the material form an image that a special camera can pick up. These scanners trace the substance as it moves through the heart area. The camera is timed with an electrocardiogram. A computer then processes the images to make it appear as if the heart is moving.
How to Prepare for the Test
You may be told not to eat or drink for several hours before the test.
How the Test will Feel
You may feel a brief sting or pinch when the IV is inserted into your vein. Most often, a vein in the arm is used. You may have trouble staying still during the test.
Why the Test is Performed
The test will show how well the blood is pumping through different parts of the heart.
Normal results show that the heart squeezing function is normal. The test can check the overall squeezing strength of the heart (ejection fraction). A normal value is above 50 - 55%.
The test also can check the motion of different parts of the heart. If one part of the heart is moving poorly while the others move well, it may mean that there has been damage to that part of the heart.
What Abnormal Results Mean
Abnormal results may be due to:
- Blockages in the coronary arteries (coronary artery disease)
- Heart valve disease
- Other cardiac disorders that weaken the heart
- Past heart attack (myocardial infarction)
- Poor pumping function
The test may also be performed for:
- Atrial septal defect
- Dilated cardiomyopathy
- Heart failure
- Idiopathic cardiomyopathy
- Peripartum cardiomyopathy
- Senile cardiac amyloid
- Testing whether a medicine has affected heart function
Nuclear imaging tests carry a very low risk. Exposure to the radioisotope delivers a small amount of radiation. This amount is safe for patients who do not have nuclear imaging tests often.
Cramer CM, Beller GA. Noninvasive cardiac imaging. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 24th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 56.
Udelson JE, Dilsizian V, Bonow RO. Nuclear cardiology. In: Bonow RO, Mann DL, Zipes DP, Libby P, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 9th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 17.