An Electrocardiographic Study on the Electrical Axis of Right Bundle Branch Block in the Aged

Abstract

There were 177 cases of complete right bundle branch block (RBBB) among 3, 698 aged people more than 60 years of age, which was an incidence of 4.8%. Electrical axis was normal in 44 cases (24.8%), left in 92 cases (52.0%) and right in 41 cases (23.2%). RBBB with left axis deviation rather constituted the most important population among the RBBB in the aged. Development of RBBB and axis deviation was examined, and about a half of cases showed stepwise development of both conduction disturbances.