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Practice guidelines for treatment of systolic dysfunction strongly recommend titrating beta-blockers to doses used in published randomized trials. Achieving this goal is often challenging in practice, because the adverse effects of beta-blockade are largely dose-related. To explore whether the benefits of beta-blockade for heart failure relates to the reduction in heart rate, even at lower-than-target doses, investigators conducted a meta-analysis of 23 randomized trials of beta-blockers in patients with heart failure.
All-cause mortality was reported in all trials, and virtually all patients had systolic dysfunction (96%) and were receiving ACE inhibitors (93%). In four trials, beta-blockade conferred a significant survival benefit; in all …