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Hypoplastic Left Heart Syndrome

A heart condition that is present at birth, and often is called a congenital heart defect. It is a group of related defects that, together, mean that the left side of the heart is underdeveloped.

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This effort is supported by funding from the U.S. Centers for Disease Control and Prevention Environmental Public Health Tracking Program, Cooperative Agreement Number 5U38EH000619-02. The contents of this Website are solely the responsibility of the authors and do not necessarily represent the official views of the Centers for Disease Control and Prevention.