Nuclear stress test

A nuclear stress test measures:

Blood flow to heart muscle at rest and during stress.

It is performed similar to a routine exercise stress test but provides images in addition to electrocardiograms.

How nuclear stress test works

1. During a nuclear stress test, a radioactive substance is injected into the bloodstream.

2. This radioactive substance mixes with blood and travels to the heart.

3. A scanner detects the radioactive material in the heart and creates images of the heart muscle.

3. Inadequate blood flow to any part of the heart will show up as a light spot on the images ( less radioactive substance got there)

Types of nuclear stress test

Myocardial perfusion scan

In Myocardial perfusion scan, the patient is requested to exercise on a treadmill

When the patient reachs the maximum heart rate, the patient is given the injection.

Images are made of the heart shortly after exercise and also a few hours later.

This test shows how well blood flows into the heart muscle and can detect narrowing of the coronary arteries (coronary artery disease).

Multiple gated acquisition (MUGA) scan

In Multiple gated acquistion scan the patient receives the injection before exercising.

Images are made of the heart before and after exercise.

A MUGA scan shows the motion of the heart and how well it pumps out blood (ejection fraction).

Ejection Fraction

Ejection Fraction is the percentage of blood that's pumped out of a filled ventricle with each heartbeat. This measures the capacity at which your heart is pumping.

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