Nuclear stress testing is a vital diagnostic procedure to confirm coronary heart disease, and unlike exercise stress test, it can detect the real cause of symptoms like chest pain and shortness of breath. If you have existing heart disease, it will aid in keeping track of your heart’s overall health. The test measures the blood flow of your heart when you are at rest and after you have experienced strenuous exercise. It demonstrates specific areas of the heart where blood flow is decreased and shows images of damaged heart muscles. If you are unable to walk on a treadmill, a medication can be used to stress the heart muscle. The before and after pictures are important to demonstrate the overall function of your heart.