Bjo¨rk-Shiley Prosthetic Valve Dysfunction Caused by Complete Disc Fracture

Kazuya Terazono＊	Takayuki Ueno＊	Kenji Toyokawa＊
Yoshihiro Fukumoto＊	Masafumi Yamashita＊	Yukinori Moriyama＊

（Division of Cardiovascular Surgery, Kagoshima Medical Center, National Hospital Organization＊, Kagoshima, Japan）

We present herein a case of disc fracture of a Bjo¨rk-Shiley valve prosthesis in the mitral position. A 69-year-old woman was admitted to our hospital with a sudden onset of dyspnea followed by deep shock. An echocardiography showed a severe degree of mitral regurgitation and moderate degree of tricuspid regurgitation. Forty-three years previously she had undergone a mitral valve replacement（MVR）for stenosis with the original version of a Bjo¨rk-Shiley valve prosthesis in another institute. Emergency redo MVR was performed with a bioprosthesis and tricuspid annuloplasty with a semirigid ring. The disc of the extracted Bjo¨rk-Shiley valve was found to have escaped from the metal housing with two intact struts. Although Bjo¨rk-Shiley valve dysfunction due to Delrin disk abration has been rarely reported, complete disk fracuture is extremely rare. The important role of regular echocardiographic follow-up should be emphasized to prevent fatal valve fracture.

 

Jpn. J. Cardiovasc. Surg. 46:247-250（2017）

Keywords：prosthetic valve dysfunction;Bjo¨rk-Shiley valve;disc fracture