Over time, children and young adults who have had a Fontan operation may find they are more tired, have difficulty breathing and cannot exercise as well as before. Currently, there are no approved medicines to prevent this decline. The purpose of this research study is to learn whether children who have had the Fontan operation can improve their ability to…
The purpose of this study is to find out if the mitral valve can be safely replaced using a procedure that issimpler than the open-heart procedure being used today and may be safer for patients who are at ahigher risk from conventional open-heart surgery. The device being studied would be implanted without the need for an open-heart procedure and without…