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Hypoplastic Left Heart Syndrome National Organization for Rare
Disorders, Inc. - Aortic and Mitral Atresia with Hypoplasic Left
Heart Syndrome Hypoplastic left heart syndrome is a term used to
describe a group of closely related rare heart defects that are
present at birth (congenital). The normal heart has four
chambers. The two upper chambers, known as atria, are separated
from each other by a fibrous partition known as the atrial
septum. The two lower chambers are known as ventricles and are
separated from each other by the ventricular septum. Valves
connect the atria (left and right) to their respective
ventricles. The valves allow for blood to be pumped through the
chambers. Blood travels from the right ventricle through the
pulmonary artery to the lungs where it receives oxygen. The
blood returns to the heart through