title: Narrow QRS ventricular tachycardia.
mesh_terms: D002037:Bundle-Branch Block / Q000175:diagnosis; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D013610:Tachycardia / Q000175:diagnosis* / Q000503:physiopathology; D013997:Time Factors