Congenital heart disease is one of the common congenital malformations in children, which is caused by the abnormal development of the heart and blood vessels during the fetal period, and the child is born with cardiovascular vascular lesions, which is the most common and diverse congenital malformation. The clinical manifestations of congenital heart disease are closely related to the pathological anatomy and pathophysiological changes caused by the congenital malformation. Some congenital malformations such as simple bilateral superior vena cava, the pathological anatomy and pathophysiological changes caused by them are not important, and the patient can have neither symptoms nor signs; some congenital malformations such as simple right-sided heart do not cause obvious pathophysiological changes, and the patient has no symptoms, but the anatomical changes of the heart moving to the right chest cavity lead to special signs. Most of the precordial diseases have certain clinical symptoms and signs, and the symptoms appear early and obvious in patients with right-to-left shunt type, while patients with no shunt type and left-to-right shunt type have mild symptoms and appear late if the lesions are mild, but those with more serious lesions may have symptoms earlier; the most obvious sign is the typical murmur. In China, Huang Kewen reported that the main clinical manifestations of neonatal precordial disease are characterized by heart murmur, cyanosis, shortness of breath, heart failure, feeding difficulties and weight gain. 2, symptoms The symptoms of precardiac disease are closely related to the type of disease, the hemodynamic changes of the lesion and its severity. Common symptoms include palpitations, shortness of breath, cough, hemoptysis, chest pain, easy fatigue, headache, dizziness, syncope, cyanosis, squatting distance and swelling, etc. Infant patients also have difficulty swallowing, poor feeding, weight loss, vomiting, easy sweating, and susceptibility to respiratory infections. The respiratory symptoms are related to pulmonary congestion, pulmonary ischemia, reduced oxygen content, tracheal compression or heart failure; chest pain, easy fatigue and central nervous symptoms are related to insufficient blood and oxygen supply to the coronary arteries, the whole body and the brain; cyanosis and squatting are common in patients with right-to-left shunts, which are caused by low arterial oxygen saturation and systemic hypoxia; edema and oliguria are often seen in congestive heart failure; Digestive system symptoms are mainly due to esophageal compression and stasis of the digestive system caused by congestive heart failure; the enlarged heart or large blood vessels compressing other organs (such as the recurrent laryngeal nerve) can also cause corresponding symptoms (such as hoarseness, etc.). In addition, the common complications of precardiac disease are: infective endocarditis, pneumonia, heart failure, arrhythmia, brain abscess, thromboembolism, etc. Most of these murmurs are accompanied by tremors, and their nature, main auscultation sites, distribution and direction of conduction vary with different malformations. Other common signs include dysplasia, cyanosis, pestle-like fingers (toes), thoracic deformity, enlargement of the heart’s turbinate, elevated pulsations in the precordial region, and changes in blood pressure and pulse rate. Patients with precordial disease have poor systemic blood supply, so most of them are stunted, but milder lesions may have no effect on development, and some patients (such as aortic constriction) are taller; cyanosis and pestle-like fingers (toes) are seen in patients with right-to-left shunts; enlarged heart is the main cause of thoracic deformity in patients with this disease, and thoracic deformity is mainly anterior cardiac bulge, but also posterior or lateral spinal protrusion deformity; aortic The blood pressure of the upper extremity is often increased when the aorta is narrowed, reduced when the aortic orifice is severely stenosed, and the pulse pressure is widened when the arteriovenous catheter is not closed or the aortic valve is not closed, and causes corresponding changes in pulse palpation.