Atrial septal defect open heart surgery scar is about 6~10 centimeters, mainly related to the patient’s condition, the size of the surgical trauma, the patient’s physical condition and recovery. There are two types of surgery for atrial septal defect, one is open heart surgery and the other is minimally invasive surgery. Minimally invasive surgery is more suitable for patients with small atrial septal defect, which usually does not leave obvious scars after the surgery, whereas open heart surgery is more suitable for patients with large atrial septal defect and more serious symptoms, which leaves more obvious scars after the surgery, and the more traumatized the surgery, the larger the scars will be. The more traumatic the surgery is, the bigger the scar will be. After the surgery, good care of the wound area can lighten and minimize the scar to a certain extent, and if the scar is still obvious, you can wait until your body recovers to undergo laser or freezing treatments. If you need open heart surgery for atrial septal defect, please go to a regular hospital in time and choose the appropriate treatment plan under the guidance of the doctor to avoid adverse consequences.