title: Mechanisms of bradyarrhythmias and blocks.
mesh_terms: D000818:Animals; D001283:Atrioventricular Node / Q000503:physiopathology; D001919:Bradycardia / Q000503:physiopathology*; D004594:Electrophysiology; D006327:Heart Block / Q000145:classification / Q000503:physiopathology*; D006329:Heart Conduction System / Q000033:anatomy & histology / Q000502:physiology / Q000503:physiopathology*; D006801:Humans; D012804:Sick Sinus Syndrome / Q000503:physiopathology; D012849:Sinoatrial Node / Q000503:physiopathology