title: Factors responsible for normal splitting of first heart sound. High-speed echophonocardiographic study of valve movement.
mesh_terms: D000328:Adult; D001021:Aortic Valve / Q000502:physiology; D004452:Echocardiography; D005260:Female; D006347:Heart Sounds; D006351:Heart Valves / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000502:physiology; D009068:Movement; D010701:Phonocardiography; D011664:Pulmonary Valve / Q000502:physiology; D013599:Systole; D013997:Time Factors; D014261:Tricuspid Valve / Q000502:physiology