Four and one half years experience with the aortic and mitral Björk-Shiley tilting disc valve.
D001021:Aortic Valve / Q000601:surgery*; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008943:Mitral Valve / Q000601:surgery*