title: The extra heart sound.
mesh_terms: D001011:Aorta / Q000503:physiopathology; D001021:Aortic Valve / Q000502:physiology; D016275:Atrial Function; D004548:Elasticity; D004562:Electrocardiography; D006326:Heart Auscultation; D006331:Heart Diseases / Q000175:diagnosis* / Q000503:physiopathology; D006333:Heart Failure / Q000503:physiopathology; D006349:Heart Valve Diseases / Q000503:physiopathology; D006350:Heart Valve Prosthesis; D006801:Humans; D008943:Mitral Valve / Q000502:physiology / Q000503:physiopathology; D008946:Mitral Valve Stenosis / Q000503:physiopathology; D010494:Pericarditis, Constrictive / Q000503:physiopathology; D010496:Pericardium / Q000502:physiology; D011651:Pulmonary Artery / Q000503:physiopathology; D011664:Pulmonary Valve / Q000502:physiology; D016276:Ventricular Function