Long-term effects of carvedilol or metoprolol on left ventricular function in ischemic and nonischemic cardiomyopathy.

Data regarding the effects of beta blockers on left ventricular (LV) function after 12 months are scarce in ischemic and nonischemic cardiomyopathy. Echocardiograms of 72 patients with ischemic and nonischemic cardiomyopathy, who were free of clinical events susceptible to alter LV function while receiving carvedilol or metoprolol for at least 24 months, were prospectively reanalyzed. Twelve months after beta-blocker initiation, LV ejection fraction (EF) increased by > or = 5% in 75% of patients, whereas EF failed to increase by 5% or decreased in the remaining 25%.