title: The electrocardiographic response to maximal treadmill exercise of asymptomatic men with left bundle branch block.
abstract: This study presents the results of maximal treadmill testing and coronary angiography in 31 asymptomatic USAF aircrewmen with acquired left bundle branch block. There were two subgroups: 26 men with normal coronary angiography and five men with significant angiographic coronary angiography and five men with significant angiographic coronary artery disease. The mean amount of maximal ST-segment depression induced by treadmill exercise was --0.5 mv. for both groups and the range in the normal subgroup was --0.3 to --1.0 mv. No significant differences were found between the groups. We concluded that apparently healthy, asymptomatic men with acquired left bundle branch block can have considerable ST-segment depression in response to maximal treadmill testing and that their ST-segment response cannot be used to make diagnostic decisions about them.
mesh_terms: D000328:Adult; D000337:Aerospace Medicine; D002037:Bundle-Branch Block / Q000175:diagnosis* / Q000503:physiopathology; D003327:Coronary Disease / Q000175:diagnosis; D005080:Exercise Test; D005500:Follow-Up Studies; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D011379:Prognosis; D012306:Risk