Definitions for "Pulmonary atresia"
complete blockage between the heart and the pulmonary artery- the main lung artery.
Absence of the normal opening from the right ventricle into the pulmonary artery.
An imperforate pulmonary valve. When associated with a VSD (variant of tetralogy of Fallot), pulmonary blood flow arises from aorto-pulmonary collaterals, and systemic venous return exits the right heart via the VSD. When associated with intact interventricular septum, pulmonary artery blood supply is via a patent ductus arteriosus, and systemic venous return exits the right heart via an obligatory ASD.