[2 cases of intermittent left bundle-branch block].
D000293:Adolescent; D002037:Bundle-Branch Block / Q000209:etiology*; D003327:Coronary Disease / Q000150:complications*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008875:Middle Aged