DSA is generally an acronym for Digital Subtraction Angiography, which is mainly used in the diagnosis of coronary artery disease and unexplained heart disease. DSA, also known as Digital Subtraction Angiography, which means Digital Subtraction Angiography, is a way to digitally image blood vessels. After a patient undergoes angiography, the entire heart will show a complex histological image, and analyzing the image at this time requires a huge amount of work, which is not conducive to accurate diagnosis. Digital subtraction angiography can remove unnecessary histologic images and retain only the vascular images. The clarity of the image is improved, with high resolution, which can be very intuitive and detailed observation of vascular lesions, accurately find the site of vascular stenosis, and save diagnostic time. In addition, DSA can also provide strong conditions for subsequent better interventional therapy, which is applicable to the diagnosis of coronary heart disease, unexplained arrhythmia and other valvular diseases. Of course, the decision of whether or not to undergo a DSA examination should be made by the doctor according to the patient’s condition, and the specific treatment should follow the doctor’s instructions.