title: Electrocardiogram of the month. Alternating bundle branch block.
mesh_terms: D002037:Bundle-Branch Block / Q000175:diagnosis* / Q000628:therapy; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011379:Prognosis