Left bundle branch block.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D002037:Bundle-Branch Block; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D008297:Male; D008722:Methods; D008875:Middle Aged