Patient: Description of the condition (time of onset, main symptoms, hospital visited, etc.): Ultrasound findings AO:1.82cm LA:2.7cm RV:1.95cm IVS:0.48cm LV:3.14cm LVPW:0.49cm RA:3.87cm MPA:2.53cm The right atrial and right ventricular diameters of the heart were enlarged, and the rest of the internal diameter of the heart chambers was normal. The main pulmonary artery internal diameter was widened, the septum was continuous and intact, and a regenerative interruption was seen in the middle of the septum with a maximum diameter of 1.72 cm. The distance from the anterior inferior border of the defect to the root of the anterior mitral leaflet was about 0.6 cm, and the posterior superior stump was about 0.73 cm. The defect was far from the upper and lower vena cava. The anterior mitral valve night cusp was soft and loose, and the leaflet closure line was relatively straight: the morphology and echogenicity of the remaining group of valves were not abnormal. No abnormalities were seen in the aorta and descending aorta. The coronary venous sinuses were not abnormal. The pulmonary veins were not abnormal in relation to their position. Ventricular wall motion analysis: no abnormalities in myocardial echogenicity, thickness and motility in all segments of the left ventricle. What is the best procedure to treat this condition? Which procedure is less risky, conventional or interventional, and is interventional surgery appropriate for this condition? Is the blocker inserted in the interventional procedure harmful to human body? Is there an expiration date for the blocker? Doctor: Interventional occlusion treatment for atrial septal defect has requirements for the location, size and edge of the defect. If the edge is close to the mitral valve, there is a risk of damage to the mitral valve or atrioventricular block (a type of arrhythmia) during occlusion. Interventional blocking therapy has been performed abroad in the last 20 years, and the blocker has been performed for a shorter period of time than conventional surgical treatment, and the long-term results are not clear. There have been reports of dislocation and perforation of the heart in the long term. In recent years, there is a tendency of blind expansion. Our hospital is the first hospital in China to perform atrial defect blocking. From our experience, we should strictly control the indications for atrial defect blocking (not all atrial defects are suitable for blocking) in order to reduce complications. For your child, surgery is recommended because the edge of the atrial defect is close to the mitral valve.