Atrial septal defect of 7.1 millimeters is abnormal and belongs to one kind of congenital heart disease. The interval between the left atrium and the right atrium is called the atrial septum, if the mother’s environment during pregnancy is not good or other pathological reasons can lead to fetal atrial septal insufficiency, the formation of an abnormal pathway between the atria is called atrial septal defect, which is a kind of congenital heart disease, not a normal situation. Atrial septal defect 7.1 mm is a medium-sized defect, if not treated in time will not only affect the child’s growth and development, but also may appear dyspnea, fatigue and weakness, lower limb edema and other symptoms, should be taken seriously. Generally speaking, atrial septal defect 7.1 mm can be effectively cured after surgical treatment and interventional occlusion, but it also requires annual review of electrocardiogram, echocardiogram and chest X-ray.