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Although rare, hypoplastic left heart syndrome, a condition in which the left side of the heart is underdeveloped, is the most serious congenital cardiovascular defect.
In hypoplastic left heart syndrome, the baby seems normal at birth, but as the ductus closes, blood cannot reach the aorta and circulation fails.
If left untreated, hypoplastic left heart syndrome is always fatal.
Hypoplastic left heart syndrome-ashen color, rapid and difficult breathing, and inability to eat.
Hypoplastic left heart syndrome is the most serious type of congenital heart disease.