| Recruiting | N/A | 1500 | US | | Johns Hopkins University, University of Maryland, Baltimore, Medstar Health Research Institute, Virginia Commonwealth University, National Heart, Lung, and Blood Institute (NHLBI) | Heart Failure, Congestive, Death, Sudden, Cardiac, Arrhythmia, Cardiomyopathies | 03/28 | 03/29 | | |