Myocardial nuclear testing, also known as nuclear myocardial imaging and loading test, is a test primarily used to check the activity of cardiac myocytes to show the activity of cardiac myocytes and the presence of necrosis. Myocardial nuclide examination mainly utilizes atomic tracers of radionuclides, such as cobalt-20, which can be quickly taken up by normal myocardial cells along with the blood flow in the coronary arteries. It is mainly used to diagnose myocarditis and determine myocardial ischemia status after myocardial infarction, and has high diagnostic value. It is commonly used for diagnosis and prognostic examination of cardiomyopathy, coronary heart disease and pulmonary heart disease. It is not recommended for patients to judge or diagnose the disease by themselves only based on this one test, and should combine all the tests to make a clear diagnosis under the guidance of a professional doctor.