Angiography is a definitive diagnostic procedure performed to determine the presence and severity of coronary artery stenosis. Angiography is used as a definitive diagnosis of coronary artery disease when clinical examination, electrocardiography, and other procedures such as exercise testing, echocardiography, and sometimes a cardiac scan or CT angiography suggest a significant likelihood of coronary artery stenosis. In the traditional method, angiography is performed through the groin, in which a narrow tube (catheter) enters the femoral artery and from there is directed to the coronary arteries. Then, by injecting radiological contrast material into these arteries, the narrow points of the artery are identified. Usually stenoses of 70% or more should be treated with angioplasty, which today is mostly done with balloons and stents at the same time. However, some specialists insert the catheter through the radial artery (wrist), which sometimes has advantages over the femoral artery (groin).

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