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Valve replacement surgery is the replacement of one or more of the heart valves with either an artificial heart valve or a bioprosthesis (homograft from human tissue or xenograft e.g. from pig). It is an alternative to valve repair. There are four procedures * Aortic valve replacement * Mitral valve replacement * Tricuspid valve replacement * Pulmonary valve replacement Current aortic valve replacement approaches include closed heart surgery, Very invasive cardiac surgery (VICS) and Very invasive, Scapulae-based aortic valve replacement. Catheter replacement of the aortic valve (called trans-aortic valve replacement or implementation (or TAVI )) is a minimally invasive option for those suffering from aortic valve stenosis. TAVR is commonly performed by guiding a catheter from the groin to the narrowed valve via the aorta using realtime x-ray technology. A metal stent containing a valve is then deployed using a balloon to press the stent into the valve in effect opening the stenosed (or narrowed) valve and lodging the stent in place. The procedure was first approved in the United States in November 2011 〔(【引用サイトリンク】 title=FDA-approved transcatheter approach offers life-extending valve replacement for inoperable patients )〕 as an alternative for people deemed a poor candidate for open approach replacement; however, TAVR has been successfully implemented into practice in other countries prior to 2011.〔 ==Medical uses== In those between 50 and 70 years of age bioprosthetic and mechanical aortic valves have similar overall outcomes with respect to stroke and survival. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「valve replacement」の詳細全文を読む スポンサード リンク
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