Hypoplastic Left Heart Syndrome

**Definition:** A condition caused by underdevelopment of the whole left half of the heart. It is characterized by hypoplasia of the left cardiac chambers (HEART ATRIUM; HEART VENTRICLE), the AORTA, the AORTIC VALVE, and the MITRAL VALVE. Severe symptoms appear in early infancy when DUCTUS ARTERIOSUS closes.

**Tree numbers:** - C14.240.400.625 - C14.280.400.625 - C16.131.240.400.625

**Synonyms:** - Left Heart Hypoplasia Syndrome - Left Heart Syndrome, Hypoplastic