Diagnosis Information

What is Hypoplastic Left Heart Syndrome?

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Hypoplastic Left Heart Syndrome (HLHS) means left-side ventricle and ascending aorta of the heart are underdeveloped. This severe congenital heart defect prevents the heart from pumping a sufficient amount of oxygenated blood to the body, and is fatal without heart surgery very shortly after birth. While in the womb, a baby with HLHS receives the mother’s oxygenated blood through via patent ductus arteriosus (PDA). The PDA typically closes within hours after birth. Where HLHS is present, the right side of the heart can’t pump blood to the rest of the body once the PDA closes. There are surgical treatments for HLHS including heart transplant, the […]