title: Electrical activity in the left bundle branch.
mesh_terms: D000200:Action Potentials; D006328:Cardiac Catheterization; D004562:Electrocardiography; D006327:Heart Block / Q000503:physiopathology; D006329:Heart Conduction System / Q000502:physiology* / Q000503:physiopathology; D006331:Heart Diseases / Q000503:physiopathology; D006339:Heart Rate; D006801:Humans; D012849:Sinoatrial Node / Q000503:physiopathology; D013997:Time Factors