title: Atrioventricular and intraventricular block.
mesh_terms: D002036:Bundle of His / Q000502:physiology; D004562:Electrocardiography; D004594:Electrophysiology; D006327:Heart Block / Q000453:epidemiology / Q000503:physiopathology*; D006329:Heart Conduction System / Q000033:anatomy & histology; D006801:Humans