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生体弁を使用した弁置換後の構造的弁劣化(structural valve deterioration:SVD)は再手術を要する場合があり,早期のSVDは患者にとって大きな不利益となる.Trifecta GT生体弁(Abbott社,St. Paul)は第三世代の生体弁と呼ばれ,本邦では2012年より使用されている.生体弁を使用した弁置換術後のSVDには,弁葉の亀裂によるもの,左室流出路のパンヌスの増生,弁葉の石灰化があげられる.われわれは,Trifecta GT生体弁置換術後の亀裂による早期SVDを4例経験したので報告する.
The third-generation Trifecta valve, Trifecta GT, has been used in Japan since 2012. The Trifecta GT is characterized by the external leaflet mounting, which increases the effective valve opening area and provide excellent hemodynamics. Lehmann et al. reported a good 8-year avoidance rate of 93.3% for structural valve deterioration (SVD) in 1,241 patients. There are three main causes of SVD after valve replacement using bioprostheses:pannus formation in the left ventricular outflow tract, calcification of the valve leaflets, and noncalcified leaflet tears. Goldman et al. reported 11 SVDs in 710 patients who underwent surgical implantation of Trifecta valve, 10 of which were due to calcification of the valve leaflets and only one of which was due to noncalcified leaflet tears. Herein, we report four cases of early SVD due to noncalcified leaflet tears after valve implantation using the Trifecta GT.
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