Atrial septal defect (ASD) is a hole in
the wall between the two upper chambers of your heart
. Smaller ASD’s may close on its own during infancy or early childhood. However, larger ASD’s can damage the heart and lungs, and contribute to shortened life span. In this case, surgery is necessary for repair to prevent complications. To know more about ASD and its course, it might be best to ask a pediatric cardiologist for medical advice. Hope this helps.