has part has part characteristic of has modifier Hypoplastic ventricle Hypoplastic right ventricle Hypoplastic right ventricle generally occurs as part of the Hypoplastic right heart syndrome (HRHS), which causes inadequate blood flow to the lungs postnatally and thus leads to cyanosis. HRHS involves pulmonary valve atresia, hypoplasia of the right ventricle, hypoplasia of the tricuspid valve, and a small, hypoplastic pulmonary artery. As the ductus arteriosus closes postnatally, infants with HRHS become critically ill. Congenital malformation of the right heart abnormal hypoplastic heart anatomical entity