title: [Body surface isopotential mapping of ventricular extrasystole, with special reference to the QRS mapping during ventricular pacing].
mesh_terms: D000818:Animals; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D004285:Dogs; D004562:Electrocardiography; D006801:Humans; D010138:Pacemaker, Artificial