title: Medical mystery--the answer.
authors.forename: J Warren
authors.initials: JW
authors.lastname: Harthorne
authors.forename: Igor
authors.initials: I
authors.lastname: Palacios
mesh_terms: D000368:Aged; D002037:Bundle-Branch Block / Q000175:diagnosis / Q000209:etiology*; D004562:Electrocardiography; D004567:Electrodes, Implanted; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D019300:Medical Errors; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D011859:Radiography