Cardiac PDA refers to a congenital heart disease with an unclosed ductus arteriosus. The pathologic process is mainly that blood can enter the pulmonary artery through the unclosed ductus arteriosus during the cardiac cycle, resulting in increased blood flow in the pulmonary circulation, making the load on the left ventricle heavier. In newborns, the ductus arteriosus closes on its own within the first year of life, but if it does not close after that age, it is called ductus arteriosus. Adults with patent ductus arteriosus may show different symptoms according to the flow rate of the heart, such as small flow rate with no obvious clinical symptoms; medium flow rate patients often have chest tightness, shortness of breath, palpitations, fatigue and other manifestations; and large flow rate patients can be secondary to severe pulmonary hypertension, and can be heard a clear heart murmur. Treatment can be interventional or surgical.