While percutaneous aortic valve replacements have been performed for more than six years in Europe, the option is not available to U.S. patients with severe aortic stenosis (AS) who are not surgical candidates, except for the select few enrolled in the Edwards Lifesciences PARTNER trial. With Medtronic applying for an FDA investigational device exemption (IDE), and a few other players emerging in Europe, the market seems explosive, but many clinical, ethical and financial questions need to be addressed before this therapy becomes a standard part of clinical practicein the U.S.