Since the valve does not open properly in<unk><unk> , there is a decrease in the forward movement of blood into the aorta.<unk>  impairs left ventricular development, which can lead to hypoplastic left heart syndrome. If untreated, HLHS is lethal, as a result of the inability of the left heart to pump enough blood to sustain normal organ function. In<unk>  life, this is condition is manageable because the ductus arteriosus acts as a bypass, and supports the delivery of oxygenated blood to the systemic circulation. However, the ductus arteriosus closes during the first few days of life, resulting in systemic circulation failure in babies born with<unk>  valve<unk> .
Fetal aortic stenosis
Small for gestational age
Large for gestational age
Fetal hydantoin syndrome
Persistent fetal circulation
Fetal warfarin syndrome
Neonatal sepsis
Craniopagus twins