Circulation, Vol 51, 477-484, Copyright © 1975 by American Heart Association
M Rotman and JH Triebwasser
The experience with bundle branch block at the USAF School of Aerospace
Medicine was reviewed. The clinical and follow-up status was evaluated in
394 subjects with right bundle branch block (RBBB) and 125 subjects with
left bundle branch block (LBBB). The majority of subjects were asymptomatic
at the time of bundle branch block diagnosis. The subjects were divided
into subfroups based on electrocardiographic (EEG) findings to determine if
any one subfroup was at higher risk for initial or follow-up morbidity of
cardiobascular disease or follow-up mortality. At initial diagnosis and
clinical evaluation, 94% of RBBB and 89% of LBBB subjects had no evidence
of cardiobascular disease. In the RBBB group, 3 and 2% had cornary heart
disease and hypertension, respectively; in LBBB subjects, 9 and 7% had
cornary heart disease and hypertension, respectively. No one ECG subfroup
in either the RBBB or LBBB group had a higher incidence of cardiobascular
disease. Complete follow-up information was available in 94% of the RBBB
subgroup subjects and 91% of the LBBB group. In the follow-up period, new
cases of coronary heart disease and hypertension occurred in 6% of the RBBB
group and 5 and 8%, respectively, in the LBBB group. Fourteen (4%) RBBB and
nine (8%) LBBB subjects died during the follow-up period. No differences
for follow-up groups. Progressive electrical dysfunction in the form of
complete heart block occurred in one subject each absence, and degree of
associated cardiobascular disease. Furthermore, within the age limits of
the present aeromedical implications of bundle block are discussed.
ARTICLES
A clinical and follow-up study of right and left bundle branch block
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