Re-examining the efficacy of -blockers for the treatment of hypertension: a meta-analysis

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Abstract
Background: In a recently published meta-analysis, investigators asserted that β-blockers should not be used to treat hypertension. Because the pathophysiology of hypertension differs in older and younger patients, we designed this meta-analysis to clarify the efficacy of β-blockers in different age groups. The primary outcome was a composite of stroke, myocardial infarction and death. Methods: We identified randomized controlled trials that evaluated the efficacy of β-blockers as first-line therapy for hypertension in preventing major cardiovascular outcomes. Both authors independently evaluated the eligibility of all trials. Trials enrolling older (mean age at baseline ≥ 60 years) patients were separated from those enrolling younger (mean age < 60 years) patients. Data were pooled using a random effects model. Results: Our analysis incorporated data from 145 811 participants in 21 hypertension trials. In placebo-controlled trials, β-blockers reduced major cardiovascular outcomes in younger patients (risk ratio [RR] 0.86, 95% confidence interval [CI] 0.74–0.99, based on 794 events in 19 414 patients) but not in older patients (RR 0.89, 95% CI 0.75–1.05, based on 1115 events in 8019 patients). In active comparator trials, β-blockers demonstrated similar efficacy to other antihypertensive agents in younger patients (1515 events in 30 412 patients, RR 0.97, 95% CI 0.88–1.07) but not in older patients (7405 events in 79 775 patients, RR 1.06, 95% CI 1.01–1.10), with the excess risk being particularly marked for strokes (RR 1.18, 95% CI 1.07–1.30). Interpretation: β-blockers should not be considered first-line therapy for older hypertensive patients without another indication for these agents; however, in younger patients β-blockers are associated with a significant reduction in cardiovascular morbidity and mortality.