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61, 95% confidence interval [CI] 0.38-0.96, p=0.03). This effect was present in 192 patients with LVEF ≤40% (HR 0.57, 95% 95% CI 0.34-0.97, p=0.04) but was not clear in 643 patients with LVEF 40% (HR 0.67, 95% 95% CI 0.25-1.76, p=0.42). In the LVEF 40% group, the results raise reasonable doubts about the real benefit of systematic use of beta-blockers as treatment for these patients. These findings reinforce the need for large randomized clinical trials within this group of patients. 40% group, the results raise reasonable doubts