Infant with cyanosis due to<unk>  Closing of the ductus arteriosus in a<unk>  that is severely underdeveloped on the<unk>  results in cyanosis and respiratory distress which can progress to cardiogenic shock and death. Early symptoms might include poor feeding or cyanosis that does not respond to oxygen administration. Peripheral pulses may be weak and extremities cool to the touch.<unk> S often co-occurs with low birth weight and premature birth. In neonates with a small atrial septal defect, termed "restrictive", there is inadequate mixing of oxygenated and deoxygenated blood. These neonates quickly decompensate and develop acidosis and cyanosis. On EKG, right axis deviation and right ventricular hypertrophy are common, but not indicative of<unk> S. Chest x-ray may show a large<unk>  (cardiomegaly) or increased pulmonary vasculature. Neonates with<unk> S do not typically have a<unk>  murmur, but in some cases, a pulmonary flow murmur or tricuspid regurgitation murmur may be audible. Co-occurring tricuspid regurgitation or right ventricular dysfunction can cause hepatomegaly to develop.
Hypoplastic left heart syndrome
Hypoplastic right heart syndrome
Asphyxiating thoracic dysplasia
Double aortic arch
Pulmonary atresia
Double outlet right ventricle
Pulmonary hypoplasia
Congenital diaphragmatic hernia