Transcatheter Aortic Valve Implantation With Sapien 3 Transcatheter Heart Valve for Pure Aortic Regurgitation

The hypothesis is that TAVI using a SAPIEN 3 THV is feasible and safe for the treatment of pure AR.

Up to now, the balloon-expandable valves have been considered contraindicated for patients with pure AR due to the absence of calcium which is considered necessary for the anchoring of the prosthesis. Nonetheless, several cases report have suggested the feasibility of TAVI using the SAPIEN XT THV, in patients with no calcified valves suggesting that an appropriate degree of oversizing might compensate the lack of calcium for the anchoring of these prostheses. The new generation balloon-expandable SAPIEN 3 THV has incorporated changes in the stent frame geometry, leaflets configuration and an external sealing skirt resulting in an increased stability and outstanding control during its implantation, a greater radial force, a reduced rate of paravalvular leaks and a covering of a wider range of annulus dimensions. These characteristics of the SAPIEN 3 THV might translate into a safer use of this device in patients with pure AR and non-calcified valves. Significant AR occurs in 2.0% of individuals of \>75 years, 13.3% of patients referred for intervention, being severe in 5% of these patients. As for aortic stenosis, its prevalence increases with age and the most frequent cause is degenerative although rheumatic and endocarditis are present. Although patients with severe AR have an excess risk of mortality and aortic valve replacement reduces mortality, only 1/3 of patients with significant AR finally undergo intervention. Reasons for no intervention are unknown. Even if it has been suggested that AR might be underestimated and the prevalence of this disease might be higher than previously reported, and a percent of patients with indication for aortic valve replacement are denied for surgery, pure AR is a small niche of patients for TAVI. In terms of cost-effectiveness, both the development of a dedicated device and the investment in the training of operators in the implantation technique might lack of interest. However, performing TAVI with a device used in the routine practice might be appealing and, importantly, safer. A preliminary case series including 3 patients have suggested the feasibility of TAVI with the SAPIEN 3 device for pure AR (Urena M, Himbert D. JACC, 2016 ). In this study we aim to evaluate the feasibility and long-term safety of the SAPIEN 3 THV in patients with pure AR.