2426 /-Blockade With Bucindolol in Heart Failure Caused by Ischemic Versus Idiopathic Dilated Cardiomyopathy
Background. We investigated the effects of bucindolol, a nonselective, non-ISA j-blocker with mild vasodilatory properties, in patients with congestive heart failure from ischemic dilated cardiomyopathy (ISCDC, n=27) and compared the results with those in subjects with heart failure from idiopathic dilated cardiomyopathy (IDC, n=22). Methods and Results. Patients were randomized in a double-blind fashion to receive 12 weeks' treatment with either bucindolol or placebo, with randomization stratified for IDC or ISCDC. Invasive (right heart catheterization) and noninvasive (echo, MUGA, central venous norepinephrine, exercise treadmill studies, and symptom scores) tests of heart failure severity were determined at baseline and end of the study. For all subjects (ISCDC plus IDC), relative to placebo treatment, bucindolol-treated patients had significant improvement in ejection fraction, left ventricular size and filling pressure, stroke work index, symptom score, and central