Transcatheter aortic valve (TAV) sizing

TAVI within failing surgical aortic bioprostheses

While oversizing a transcatheter heart valve (THV) is a critical step in TAVI, it remains a complex question in TAV-in-SAV procedures. Apps exist to help in sizing transcatheter aortic valves (TAV), as well as industry guidance on valve dimensions and aortic annuli measurements. A consensus has emerged behind the choice of CT evaluation as the most appropriate method for measuring the “true diameter” of a degenerated bioprosthesis and correctly sizing the prostheses.  Insufficient sizing of either self-expanding or balloon expandable transcatheter valves has been associated with more paravalvular leak (PVL), valve migration and patient-prosthesis mismatch.