title: Determination of severity of stenotic and regurgitant valvular lesions by Doppler ultrasound.
mesh_terms: D001783:Blood Flow Velocity; D001794:Blood Pressure; D004301:Doppler Effect; D004452:Echocardiography / Q000295:instrumentation / Q000379:methods*; D006349:Heart Valve Diseases / Q000175:diagnosis / Q000503:physiopathology*; D006350:Heart Valve Prosthesis; D006351:Heart Valves / Q000503:physiopathology; D006801:Humans; D011651:Pulmonary Artery; D013318:Stroke Volume; D014463:Ultrasonography