title: Detection of thrombosed aortic Björk-Shiley valve by two-dimensional echocardiography.
mesh_terms: D001021:Aortic Valve / Q000503:physiopathology; D004452:Echocardiography; D004868:Equipment Failure; D006350:Heart Valve Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013927:Thrombosis / Q000209:etiology* / Q000601:surgery