title: Changing views on the mechanism of the first and second heart sounds.
mesh_terms: D000818:Animals; D001021:Aortic Valve / Q000502:physiology; D001281:Atrial Fibrillation / Q000503:physiopathology; D016275:Atrial Function; D001794:Blood Pressure; D002037:Bundle-Branch Block / Q000503:physiopathology; D002302:Cardiac Output; D004285:Dogs; D004452:Echocardiography; D004562:Electrocardiography; D006326:Heart Auscultation; D006327:Heart Block / Q000503:physiopathology; D006344:Heart Septal Defects, Atrial / Q000503:physiopathology; D006347:Heart Sounds; D006350:Heart Valve Prosthesis; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D006976:Hypertension, Pulmonary / Q000503:physiopathology; D008943:Mitral Valve / Q000502:physiology / Q000503:physiopathology; D011664:Pulmonary Valve / Q000502:physiology; D014261:Tricuspid Valve / Q000502:physiology / Q000503:physiopathology; D016276:Ventricular Function