title: Cardiac resynchronization therapy and the electrical substrate in heart failure: what does the QRS conceal?
authors: Department of Cardiac Electrophysiology, Cleveland Clinic, Cleveland, Ohio 44195, USA. varman@ccf.org
authors: Niraj
authors: N
authors: Varma
mesh_terms: D002037:Bundle-Branch Block / Q000175:diagnosis / Q000503:physiopathology* / Q000628:therapy; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006333:Heart Failure / Q000175:diagnosis / Q000503:physiopathology* / Q000628:therapy*; D006801:Humans