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Hypoplastic Left Heart Syndrome Overview. Hypoplastic left heart syndrome (HLHS) is a spectrum of disease characterized by underdevelopment of the left ventricle with obstruction or atresia of ventricular inflow and outflow. HLHS accounts for approximately 2% to 3% of all…

Atrial Septal Defect Overview. An atrial septal defect (ASD) is a defect in the atrial septum that allows communication between the right atrium (RA) and left atrium (LA). Isolated ASDs account for 6% to 10% of all congenital heart disease.…