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Regurgitation mechanisms after transcatheter aortic valve implantation. A. Transvalvular regurgitation (arrow); B. Paravalvular regurgitation between the prosthesis and the aortic annulus (arrow); C. Supra-skirtal regurgitation above the skirt (arrow). Adapted from www.edwards.com/products/transcathetervalve/Pages/sapienthv.aspx
