In pulmonary atresia, the valve that lets blood flow from the heart to the lungs isn't formed properly. Instead, some blood may enter the lungs through a temporary connection (ductus arteriosus) between a baby's aorta and the pulmonary artery. Some babies born with pulmonary atresia may have a small right ventricle.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Make your tax-deductible gift and be a part of the cutting-edge research and care that's changing medicine.