Patent Ductus Arteriosus (PDA)

Patent ductus arteriosus is the second most common congenital heart defect seen in adults (approximately 10%-15% of all CHD in adults). PDA is present as an isolated lesion in most adults, unlike in children, in whom it is often seen with more complex heart defects. The ductus connects the descending aorta at the level of the subclavian artery to the proximal left pulmonary artery. As in VSD, patients with a large uncorrected PDA can develop pulmonary hypertension.