title: What's wrong with pacing?
mesh_terms: D001283:Atrioventricular Node / Q000503:physiopathology; D002302:Cardiac Output; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000628:therapy; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D009200:Myocardial Contraction; D010138:Pacemaker, Artificial; D005082:Physical Exertion