title: The first heart sound in intermittent left bundle branch block.
mesh_terms: D000328:Adult; D001794:Blood Pressure; D002037:Bundle-Branch Block / Q000503:physiopathology*; D006328:Cardiac Catheterization; D004562:Electrocardiography; D006801:Humans; D007702:Kinetocardiography; D008297:Male; D010701:Phonocardiography