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Myocardial perfusion scintigraphy is a nuclear medicine test that assesses blood flow in the heart muscle under rest and stress conditions. It uses a small amount of radioactive substance to visualize areas with reduced blood flow, helping to identify ischemic regions and previous infarcts. This test is crucial for evaluating coronary artery disease, which often results from atherosclerosis and can lead to chest pain or shortness of breath. The results guide treatment decisions, including medication, coronary angiography, or revascularization procedures.