<qa>  What type of heart condition is a congenital heart defect?All subjects who are treated at Sibley Heart Center at Childrens Healthcare of Atlanta with the diagnosis of a congenital heart defect or an acquired heart condition i.e. heart failure may be approached for possible participation into the study. These patients will include newly diagnosed patients as well as patients who were diagnosed in previous years and have received medical treatment for their defect or condition. The following describe study procedures: 