title: [Late malfunction of the Björk-Shiley valve prosthesis due to Delrin disc defacement].
abstract: A 55-year-old woman eighteen years after mitral valvular replacement with Delrin disc Björk-Shiley valve prosthesis underwent a reoperation of prosthetic valve replacement for the prosthetic malfunction due to disc defacement. The patient suffered from faintness and vertigo at rest. An echocardiographic examination showed a moderate mitral insufficiency with a normal disc movement. Precise examination on the removed prosthesis revealed accelerated defacement of disc margin which made the ring-disc clearance up to 0.35 mm and strut-shaped groove formation on the inlet surface of the disc occluder. These findings suggested a pronouncedly earlier disc wear than predicted by Björk and co-workers. We concluded, therefore, that a patient undergone a valve replacement with Delrin disc Björk-Shiley valve should be examined periodically by echocardiography even though being without any symptoms.
authors.affiliation: Department of Surgery, Fukuyama Cardiovascular Hospital, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Katsumata
authors.forename: T
authors.initials: T
authors.lastname: Shimakura
authors.forename: H
authors.initials: H
authors.lastname: Nakano
authors.forename: Y
authors.initials: Y
authors.lastname: Shimamura
authors.forename: K
authors.initials: K
authors.lastname: Hoshino
authors.forename: T
authors.initials: T
authors.lastname: Harada
authors.forename: F
authors.initials: F
authors.lastname: Maejima
authors.forename: H
authors.initials: H
authors.lastname: Kohno
authors.forename: K
authors.initials: K
authors.lastname: Asakawa
authors.forename: A
authors.initials: A
authors.lastname: Yabuki
mesh_terms: D005260:Female; D006350:Heart Valve Prosthesis; D006801:Humans; D008875:Middle Aged; D008943:Mitral Valve; D011475:Prosthesis Failure; D012086:Reoperation