Depending on recipe and cooking method it may be either a flaky potato pie, or a heavy potato pudding.
Ductus arteriosus: A short vessel through which blood headed from the heart via the pulmonary artery to the lungs is shunted before birth. This blood is shunted away from the lungs and returned to the aorta. When the shunt is open, it is said to be patent.
At this point, the ductus arteriosus is not needed to bypass the lungs. Under normal circumstances, within the first few days or weeks after birth, the ductus arteriosus closes and blood no longer passes through it. Most babies have a closed ductus arteriosus by 72 hours after birth. In some babies, however, the ductus arteriosus remains open (patent) and becomes a problem, PDA. The opening between the aorta and the pulmonary artery allows oxygen-rich (red) blood to pass back through the blood vessels in the lungs.