Once someone is found to have an atrial septal defect, a determination of whether it should be corrected has to be made. Surgical mortality due to closure of an ASD is lowest when the procedure is performed prior to the development of major pulmonary hypertension. The lowest mortality rates are achieved in individuals with a pulmonary artery systolic pressure of less than 40 mmHg.
Atrial septal defect (ASD) is a form of congenital heart defect that enables blood flow between the left and right atria via the interatrial septum. The interatrial septum is the tissue that divide the right and left atria. Without this septum, or if there is a imperfection in this septum, it is possible for blood to travel from the left side of the heart to the right side of the heart, or vice versa. Irrespective of interatrial communication bi-directions, this results in the mixing of arterial and venous blood