<unk>  is a congenital<unk>  defect in which the<unk>  atrium and<unk>  ventricle are underdeveloped. This defect causes inadequate blood flow to the lungs and thus, a blue or cyanotic infant.
Hypoplastic right heart syndrome
Hypoplastic left heart syndrome
Asphyxiating thoracic dysplasia
Pulmonary atresia
Pulmonary hypoplasia
Congenital diaphragmatic hernia
Absent pulmonary valve syndrome
Double aortic arch