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Early Structural Valve Deterioration of Third-Generation Porcine Bioprosthesis in Patients
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（Department of Cardiovascular Surgery, Kameda Medical Center, Kamogawa, Japan）
| Mitsuhisa Kotani |
Masaaki Toyama |
Masanori Katoh |
| Yuji Kato |
Kazuhiro Hisamoto |
Yukiharu Sugimura |
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A 78-year-old woman underwent mitral valve replacement（MVR）with bioprosthesis in 1984. By 1997 the valve had become dysfunctional and was replaced with a Mosaic valve. Dyspnea on exertion occurred in 2005 and a systolic murmur was detected at that time. Echocardiography revealed severe mitral regurgitation（MR). The mitral valve was replaced for the third time. The explanted valve showed commissural dehiscence at the stent position and calcified leaflets. The mitral valve of a 70-year-old man was replaced with a bioprosthesis in 1986, and again with a Mosaic valve in 1997 because the original bioprosthesis had become dysfunctional. Seven years later, a systolic murmur appeared and echocardiography revealed severe MR. The valve was replaced for the third time. A leaflet tear was found in the removed valve. The Mosaic valve is a third generation porcine bioprosthesis that reportedly has excellent long-term durability. However, in these cases, the Mosaic valves deteriorated prematurely, and no obvious causes of this early structural deterioration could be identified. Continued long-term follow up is necessary, and the possibility of premature deterioration should be considered when selecting bioprostheses.
Jpn. J. Cardiovasc. Surg. 39:339-342（2010）
Keywords：bioprosthesis, structural valve deterioration, reoperation, Mosaic valve
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