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I don't know the reason why you are being considered for mitral valve surgery, and epending on the etiology of your mitral valve dysfunction you may or may not be a candidate for a percutaneous procedure called the E clip or mitral valve repair via a metallic clip. It works for mitral regurgitation and not for mitral stenosis. It is not a full replacement, and the valve cannot at this time be replaced percutaneously at this time. The materials used are various but the u clips are made out of Nitinol.
Open heart surgery is the best way to fully assess the valve if you are a candidate for open heart surgery. And if you need valve surgery ( cannot be performed percutaneously) then valve repair is much preferred over replacement, as this does not alter the left ventricular geometry/ subvalvular aparatus as much. Make sure whatever surgeon you choose is well familiar with this procedure.