1, what are the symptoms of congenital heart disease: frequent colds, recurrent bronchitis, pneumonia; infants have difficulty feeding or refusing to eat, choking, often shortness of breath, pallor, breath-holding and other phenomena. Some infants have persistent cyanosis of the skin, nose tip, lips, finger (toe) nail bed, and often prefer to squat for a moment when walking or playing. Infants and children with precordial disease are significantly behind the development of children of the same age, manifesting as thinness, malnutrition, growth retardation, etc. Young children appear chest pain, syncope. 2, when is the best time to operate for congenital heart disease: when to operate for congenital heart disease in children, this is a matter of great concern to parents. Many parents believe that the child is too young to withstand the torment of surgery, it is safer to wait until the child is older and stronger before performing surgery. Unbeknownst to them, many children delay the surgery time again and again, thus losing the timing of the surgery or seriously affecting the growth and development of the child, causing lifelong regrets. With the high development of modern medicine, the operation time for children with congenital heart disease cannot be determined by their age, but should be determined by a cardiologist according to their condition after a comprehensive examination at the hospital. The youngest age for heart surgery in our hospital is less than 30 days for newborns. The treatment of complex cyanotic heart disease: we often say “purple baby” often has cyanotic congenital heart disease (such as large-vessel dislocation, tetralogy of Fallot, etc.), these children often manifest as a persistent whole-body cyanosis after birth (can also be gradually obvious three to four months after birth), in the lips of the mouth, finger (toe) nail bed, the tip of the nose most It is most pronounced on the lips, nail beds, and nasal tips, and worsens with activity, crying, breath-holding, or pneumonia. Therefore, children with cyanosis should be examined by cardiovascular surgery as soon as possible after birth, and once the diagnosis is confirmed, early radical surgery should be performed if possible. For those who do not have the conditions for radical surgery, they can first undergo reduction surgery to improve the symptoms of the child, reduce cyanosis, improve the survival rate, and create conditions for second-stage radical treatment. With the progress of medical science and technology, most of the “purple children” can be cured, and some of them can improve their symptoms and quality of life. 4, interventional treatment of precordial disease: interventional treatment of precordial disease is to insert a catheter along the blood vessel to the site of the heart to be reached, the choice of special equipment to implement the lesion blockage, expansion or embolization of the treatment method. At present, some precardiac diseases such as atrial septal defect, ventricular septal defect, patent ductus arteriosus and pulmonary valve stenosis can be completely cured by interventional treatment, and the children can live, study and work as normal people after the operation. The success rate of interventional treatment has reached 95% to 100%. The advantages of interventional treatment are less trauma, shorter operation time and faster recovery after surgery. However, not all precordial diseases can be treated by intervention, only a small number of simple precordial patients can be treated by this method, while young and complex precordial diseases are not suitable for interventional treatment.