What is ptc imaging? Is the imaging uncomfortable?

Coronary artery is a blood vessel supplying myocardial blood, with two branches, left and right, which open directly in the left and right aortic sinus respectively at the root of the aorta, from which they begin to extend to the surface of the heart and continue to branch into the heart. Since blood and vascular wall are equally opaque and overlap with the heart, when atherosclerotic plaque or stenosis occurs in the vascular lumen, it cannot be seen under ordinary X-ray. Selective coronary angiography is to make percutaneous puncture of a specially shaped cardiac catheter into the femoral artery of the lower extremity, retrograde along the descending aorta to the root of the ascending aorta. The catheter is placed at the left and right coronary artery opening respectively, and X-ray cinematography or tape recording is performed at the same time as the developer is injected. In this way, the vascular lumen of the whole left or right coronary artery and its branches can be clearly displayed. It can understand whether there is a stenosis lesion, make a clear diagnosis of the lesion site, scope, severity and condition of the vascular wall, decide the treatment plan (intervention, surgery or medical treatment), and judge the curative effect. This is a relatively safe and reliable invasive diagnostic technique, which has been more and more accepted in clinic and was once considered as the "gold standard" for diagnosing coronary heart disease.