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The Carpentier rigid ring and the Duran flexible ring have been used for mitral valve repair. The Carpentier ring reduces mitral insufficiency very effectively, but it causes minor systolic dysfunction. Meanwhile, the Duran ring interferes less with the normal movements of the mitral annulus during the cardiac cycle than the Carpentier ring.

Long-term clinical results of mitral valvuloplasty using flexible and rigid rings: A prospective and randomized study