title: AV synchrony and cardiac rate.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000503:physiopathology / Q000628:therapy*; D001283:Atrioventricular Node / Q000503:physiopathology*; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D009200:Myocardial Contraction; D010138:Pacemaker, Artificial