Is atrial septal defect the same thing as patent ductus?

These are not the same thing, an atrial septal defect, or ASD, is an opening in the tissue separating the left and right atrium. The ductus arteriosus is a structure present in fetus which allows blood to bypass the lungs and go to the placenta. This usually closes at delivery but can be closed surgically if needed. Often doctors use medications to close it after delivery.