"Outcomes Following Transcatheter Aortic Valve Replacement in the United States"
JAMA
http://jama.jamanetwork.com/article.aspx?articleid=1779535 
"Conclusions and Relevance  Among patients undergoing TAVR at US centers in the STS/ACC TVT Registry, device implantation success was achieved in 92% of cases, the overall in-hospital mortality rate was 5.5%, and the stroke rate was 2.0%. Although these postmarket US approval findings are comparable with prior published trial data and international experience, long-term follow-up is essential to assess continued efficacy and safety."