When the patient’s nails are lightly pressed with a finger or the mucous membrane of the patient’s mouth and lips with a slide, it can make the area white, and when the heart contracts, the area is red again, and the regular alternation of red and white occurs locally with the cardiac cycle is the capillary pulsation sign. Capillary pulsation is often due to severe aortic valve insufficiency caused by damage to the valve leaflets due to rheumatic fever. When these conditions occur, small veins or arteries appear on the skin as red filamentous mesh or stellate damage pressure of the peripheral capillary wall dilatation, the disease is a capillary dilatation disease of unknown cause that spreads over the extremities and trunk. It is most commonly seen in women aged 40 to 50 years. The following are also common causes of capillary pulsation: 1. aortic insufficency Aortic insufficency can be caused by lesions of the aortic valve and annulus, as well as the ascending aorta, and is common in men, accounting for about 75% of patients; in women, it is accompanied by mitral valve lesions. Chronic onset is most often caused by leaflet damage due to rheumatic fever, accounting for two-thirds of all patients with aortic valve insufficiency. 2, generalized idiopathic telangiectasia (generalized idiopathic telangiectasia). This disease is a kind of capillary dilatation of the extremities and trunk of unknown cause. It is most commonly seen in women aged 40 to 50 years. The cause is unknown. The lesions first appear on the lower legs or along the nerves, usually in a linear pattern, and may also appear as small hemangiomas. No specific treatment, oral antibiotics may be effective for some patients. 3, arteriovenous ductus arteriosus This disease is more common, accounting for 15% of the total number of precordial disease, more common in women. The ductus arteriosus begins to close functionally 10-15 hours after birth. After 2 months to 1 year of age, most of them are closed, and those who are still not occluded after 1 year of age are considered to have an unclosed ductus arteriosus. 4.Aortopulmonary septal defect Aortopulmonary septal defect or aortopulmonary window is a relatively rare congenital macrovascular malformation, according to Stansel 1977, less than 100 cases have been reported in the literature. The defect or window is located between the ascending aorta and the common pulmonary artery, and its pathophysiological and clinical manifestations resemble those of an unclosed ductus arteriosus. During the 5th to 8th week of embryonic life, the main-pulmonary septum separates the arterial trunk into the ascending aorta and the common pulmonary artery. During the same period, the ventricular septum separates the ventricular cavity into the left and right ventricles, and eventually the lower part of the arterial septum fuses with the upper part of the ventricular septum, allowing the left and right ventricles to communicate with the aorta and the pulmonary artery, respectively. If the above separation is imperfect, the main-pulmonary artery septal defect, constant arterial trunk or high ventricular septal defect are formed according to their elevated position, respectively.