Patients were randomized into two treatment arms consisting of conventional therapy alone for congestive heart failure or combined with a twenty-four week regimen of immunosuppressive therapy. Immunosuppressive therapy consisted of prednisone with either cyclosporine or azathioprine. The primary outcome measure was a change in the left ventricular ejection fraction at twenty-eight weeks. Secondary endpoints included survival, failures of therapy, requirements for conventional therapy, assessments of symptoms, myocardial histology, and arrhythmias.