title: Non invasive assessment of mechanical valve obstruction.
authors.forename: Piero
authors.initials: P
authors.lastname: Montorsi
authors.forename: Giovanni
authors.initials: G
authors.lastname: Teruzzi
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Calligaris
mesh_terms: D001021:Aortic Valve / Q000000981:diagnostic imaging / Q000601:surgery*; D001024:Aortic Valve Stenosis / Q000175:diagnosis / Q000209:etiology; D003951:Diagnostic Errors; D004452:Echocardiography; D005471:Fluoroscopy; D006349:Heart Valve Diseases / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D006350:Heart Valve Prosthesis; D006801:Humans; D017063:Outcome Assessment, Health Care; D011183:Postoperative Complications / Q000175:diagnosis / Q000209:etiology