Patient: Description of condition (onset, main symptoms, hospital visited, etc.): My daughter is 5 years and 9 months old with an unclosed arterial duct (funnel-shaped) and currently has a heart murmur and no other significant symptoms. The most recent echocardiography (April 28, 2011) showed: 1. normal internal diameter of each atrium; 2. normal thickness and amplitude of motion of each ventricular wall; 3. good continuity of atrial septum, CDFI: (-); 4. no significant abnormality of each valve, CDFI: (-); 5. aorta in the right posterior and pulmonary artery in the left anterior. A small anomalous channel was seen between the descending aorta and the left pulmonary artery, with a pulmonary artery end of about 2 mm, CDFI: left-to-right thin linear shunt signal was detected at the level of the aorta, Vmax 458 cm/s, PG:84 mmHg. Echocardiogram on March 31, 2011 showed a funnel-shaped echogenic loss between the bifurcation of the main pulmonary artery and the descending aorta, with an opening at the aortic end of about 1.6 mm. The opening at the aortic end was about 1.6 mm, the opening at the descending aorta end was about 3.5 mm, and the length was about 5 mm. A two-phase continuous positive turbulent flow spectrum was seen in the main pulmonary artery. At 4 years of age, the echocardiogram showed a loss of echo at the bifurcation of the main pulmonary artery, which was connected to the descending aorta, and a 2-mm double-phase continuous shunt was seen. At 7 months of age, the echocardiogram showed that the descending aorta was connected to the bifurcation of the main pulmonary artery near the opening of the left pulmonary artery with an abnormal duct with a 3-4 mm hollowness and a continuous flow signal with a Vmax of 4.5 m/s. A 4 mm left-to-right shunt signal was seen in the middle of the septum. I have consulted with the doctor concerned, there are two views: 1, timely intervention to avoid future problems; 2, observation, there is no need for intervention the chance of future problems is very small, in addition, the gap is very small, intervention may not be successful. Now we parents are in a dilemma, please help solve it in your busy schedule, thank you very much: 1, 2mm can be interventional treatment? We have a check of 1.6 mm. 2. When is the best time to intervene? There is a view that the arteries are becoming increasingly hardened and fragile as the child gets older, and the risk of surgery increases. Does this problem exist? 3.What are the problems that need attention after the intervention? Some people say that MRI cannot be done and high pressure cannot be approached, is this true? 4. I would really like to hear your advice on the pros and cons of intervention and non-intervention.