Left bundle branch block.
D000293:Adolescent; D000328:Adult; D000337:Aerospace Medicine; D002037:Bundle-Branch Block / Q000453:epidemiology / Q000503:physiopathology*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D008887:Military Medicine; D014481:United States; D014672:Vectorcardiography