title: The first heart sound: its relation with the apex cardiogram.
mesh_terms: D006321:Heart / Q000503:physiopathology*; D006326:Heart Auscultation; D006331:Heart Diseases / Q000503:physiopathology*; D006801:Humans; D007702:Kinetocardiography; D008946:Mitral Valve Stenosis / Q000503:physiopathology; D010701:Phonocardiography