There are currently 8 prosthetic transcatheter<unk><unk>  which are available. Two of these are FDA approved in the United States. The CHOICE trial is a small study which compared the most prominent two<unk> s (CORE and SAPIEN) and no major significant differences were found in primary clinical endpoints between both<unk> s. Nevertheless, there are situations, anatomical variability, and operator preferences that continue to make one<unk>  more preferable to the other, depending on the situation. There are currently three ongoing major trials comparing newer generation<unk> s to the aforementioned devices.
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