Atrial Septal Defect (ASD) is a condition where there is an opening in the wall between the atria of the heart. It is also known as the heart hole among the public. ASD may cause some of the clean blood to pass to the right heart, causing enlargement of the lungs and heart over time. ASD Symptoms: Since Atrial Septal Defect does not cause any serious symptoms for a long time, it can occur very late in some patients...