 The purpose of this study is to evaluate whether patients with chronic heart failure not due to coronary artery disease who require use of a left ventricular assist device LVAD for refractory heart failure can recover sufficient heart function to allow the pump to be explanted. The study aims to avoid the need for transplantation in these patients by using standard heart failure medications to reduce the size of the left ventricle and then using the investigational drug, clenbuterol, to further improve left ventricular function. 