What is the prognostic significance of asymptomatic left bundle branch block?
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In the absence of structural heart disease, left bundle branch block (LBBB) in an asymptomatic patient has not been shown to confer greater all-cause mortality risk. (SOR B, based on a single cohort study.) However, asymptomatic LBBB is associated with later development of heart failure and with cardiac death (SOR B, with a single cohort study reporting each association).
Evidence Based Practice 11(5): 07.