CT Scan Sizing for Perceval Sutureless Valve

The Perceval sutureless aortic bioprosthesis is a bovine pericardium valve mounted in a nitinol stent that can be compressed and positioned in a valve delivery system. Similarly, to transcatheter aortic valve implantation (TAVI) devices, the anchoring and good sealing of the Perceval bioprosthesis relies on oversizing by design of the nitinol stent compared with the native aortic annulus. With the advent of TAVI, cardiac computed tomography (CT) has become the gold standard technique for measuring the aortic annulus in patients undergoing transcatheter procedures, and the CT-derived axial image of the aortic virtual basal ring (VBR) is considered as the reference for sizing by most of the manufacturers of transcatheter valves . Interestingly, the VBR lies exactly on the plane passing through the nadir of the 3 aortic cusps, that is where, according to the instructions for use, a correctly positioned Perceval valve should be deployed. VBR could then provide a good estimate of the annular dimension for the Perceval pre-operative sizing.