Atrial septal defect is one of the most common congenital defects in children and adults. If small, an atrial septal defect is often discovered incidentally and does not cause any problems. Atrial septal defect closure can even occur spontaneously in newborns without intervention. On the contrary, large, long-standing atrial septal defects can damage the patient's heart and lungs. Atrial septal defect closure surgery is considered a necessary treatment to correct an atrial septal defect and prevent subsequent complications.