The tricuspid septal and/or posterior valves occasionally attach to the right ventricular wall near the apex along with the anterior valve inferiorly in about 0.5% to 1.0% of cases of precordial disease. The pulmonary blood is low and the heart shadow is enlarged, the aortic and pulmonary artery shadows are small, and the heart shadow resembles a balloon. Congenital cardiovascular disease is the most common type of congenital malformation. With advances in cardiac diagnostic methods and surgical treatment techniques, the majority of congenital cardiovascular diseases can now be clearly diagnosed and surgically corrected for treatment, and the prognosis has improved significantly from the previous ones. What are the symptoms that are easily confused? 1, arteriovenous ductus arteriosus, ventricular septal defect, atrial septal defect In the early stage of the disease, there is no cyanosis because the blood is shunted from the artery to the vein, which is a left-to-right shunt type; however, in the late stage, the pressure on the left side of the heart exceeds that on the right side, and cyanosis appears. 2, Tetralogy of Fallot, transposition of the great arteries, pulmonary atresia Because some or all of the venous blood shunts directly into the arteries, it belongs to the right-to-left shunt type, so there is cyanosis after birth. 3. Pulmonary stenosis, aortic stenosis, aortic constriction Despite the presence of cardiac malformation, there is no abnormal channel between the left and right sides, which is a non-shunt type, and therefore, cyanosis does not appear throughout life. Among congenital cardiovascular diseases, ventricular septal defect, patent ductus arteriosus and tetralogy of Fallot are more likely to be complicated by infective endocarditis, which affects the prognosis and requires attention to prevention and treatment. The optimal timing of surgery depends on a number of factors, including the complexity of the congenital malformation, the age and weight of the child, and the general development and nutritional status of the child. Generally, for simple congenital heart, it is recommended to be 1 – 5 years old, because too young, low weight, poor systemic development and nutritional status will increase the risk of surgery; too old, the heart will compensate for the increase in size, and some will even have increased pulmonary artery pressure, which will also increase the difficulty of surgery and longer postoperative recovery time. For those with combined pulmonary hypertension, serious congenital malformations that affect growth and development, malformations that threaten the life of the child, or complex malformations that require staged surgery, the earlier the surgery the better, regardless of age.