title: New studies on the first heart sound.
mesh_terms: D000162:Acoustics; D000818:Animals; D001011:Aorta / Q000502:physiology; D001021:Aortic Valve / Q000502:physiology; D001022:Aortic Valve Insufficiency / Q000503:physiopathology; D001281:Atrial Fibrillation / Q000503:physiopathology; D001794:Blood Pressure; D006328:Cardiac Catheterization; D006332:Cardiomegaly / Q000503:physiopathology; D002932:Cineangiography; D004106:Dilatation / Q000150:complications / Q000503:physiopathology; D004285:Dogs; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006326:Heart Auscultation; D006327:Heart Block / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D006984:Hypertrophy; D008943:Mitral Valve / Q000502:physiology; D008944:Mitral Valve Insufficiency / Q000503:physiopathology; D008946:Mitral Valve Stenosis / Q000503:physiopathology; D009203:Myocardial Infarction / Q000503:physiopathology; D010701:Phonocardiography; D013016:Sound; D013909:Thorax / Q000502:physiology; D014159:Transducers; D014261:Tricuspid Valve / Q000502:physiology; D016276:Ventricular Function; D014732:Vibration