Despite the higher device success rate with the balloon-expandable valve , @-year follow-up of patients in CHOICE ( Randomized Comparison of Transcatheter Heart Valves in High Risk Patients With Severe Aortic Stenosis : Medtronic CoreValve Versus Edwards SAPIEN XT Trial ) , with limited statistical power , revealed clinical outcomes after transfemoral transcatheter aortic valve replacement with both balloon - and self-expandable prostheses that were not statistically significantly different .