Key result
Right bundle branch block was associated with a modest increase in all-cause mortality (HR 1.08) that was sensitive to exclusion of the largest study, with no significant association observed for cardiovascular mortality.
Why the study?
The prognostic significance of right bundle branch block (RBBB) in the general population remains uncertain.
Does right bundle branch block (RBBB) increase all-cause mortality and cardiovascular mortality in asymptomatic adults from the general population?
Meta-Analysis
Does right bundle branch block (RBBB) increase all-cause mortality and cardiovascular mortality in asymptomatic adults from the general population?
Hazard Ratio: 1.08 (95% CI 1.01–1.16)
In the general population, right bundle branch block acts as a weak prognostic marker associated with a modest but partially unstable increase in all-cause mortality and a higher risk of future pacemaker implantation, rather than a strong causal determinant of cardiovascular mortality.
RBBB should not yet inform mortality risk assessment in general populations; leaves open its utility for pacemaker implantation prediction.
Background: Because the prognostic significance of right bundle branch block (RBBB) in the general population remains uncertain, we conducted a systematic review and meta-analysis to evaluate the association of RBBB with clinical outcomes in general population cohorts. Methods and Results: We systematically searched major databases for population-based cohort studies reporting associations between RBBB and clinical outcomes. Hazard ratios (HRs) were pooled using a random-effects model. A total of 14 studies were included in the systematic review, of which 5 (all-cause mortality), 4 (cardiovascular mortality), and 2 studies (pacemaker implantation) were included in the meta-analyses. RBBB was associated with a modest increase in all-cause mortality (HR 1.08; 95% confidence interval (CI), 1.01-1.16), although the association was attenuated in the sensitivity analysis excluding the largest-weight study (HR 1.04; 95% CI, 0.87-1.24). No significant association was observed between RBBB and cardiovascular mortality (HR 1.20; 95% CI, 0.90-1.59). RBBB was associated with an increased risk of pacemaker implantation (HR 3.03; 95% CI, 1.70-5.38), although the number of studies was limited. Conclusions: RBBB was associated with a modest and partially unstable increase in all-cause mortality, but no significant association with cardiovascular mortality was observed. RBBB may reflect underlying risk profiles or progressive conduction system abnormalities, rather than serving as a strong independent predictor of mortality.
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Kawakami et al. (2026) conducted a meta-analysis in Asymptomatic adults from the general population. Right bundle branch block vs. Individuals without right bundle branch block was evaluated on All-cause mortality (HR 1.08, 95% CI 1.01-1.16). Right bundle branch block was associated with a modest increase in all-cause mortality (HR 1.08) that was sensitive to exclusion of the largest study, with no significant association observed for cardiovascular mortality.
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