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Hypoplastic left heart syndrome (HLHS) is a birth defect that affects normal blood flow through the heart. As a baby develops during pregnancy, the left side of the heart does not form correctly. HLHS is one type of congenital heart defect. Congenital means present at birth. Because a baby with this defect needs surgery or other procedures soon after birth, HLHS is considered a critical congenital heart defect (CCHD).Hypoplastic left heart syndrome (HLHS) is a birth defect that affects normal blood flow through the heart. As a baby develops during pregnancy, the left side of the heart does not form correctly. HLHS is one type of congenital heart defect. Congenital means present at birth. Because a baby with this defect needs surgery or other procedures soon after birth, HLHS is considered a critical congenital heart defect (CCHD).
