How do you decide between using a self-expanding supraannular valve and a balloon-expandable valve for TAVR in patients with severe aortic stenosis and a small aortic annulus?  

A supra-annular design intuitively allows for lower gradients on echo, so this endpoint was expected. But overall, the data thus far does indeed make a SEP an attractive choice as compared to a BEP, in patients with a small annulus. This is a fairly large subset of patients with AS. The risk of need...