Obstructions to left ventricular outflow.
D000293:Adolescent; D001021:Aortic Valve; D001024:Aortic Valve Stenosis / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D001807:Blood Vessel Prosthesis; D002648:Child; D004452:Echocardiography; D006350:Heart Valve Prosthesis; D006439:Hemodynamics; D006801:Humans; D007231:Infant, Newborn; D014463:Ultrasonography