Research recommendation(s) from an individual piece of guidance Guidance: Valve-in-valve TAVI for aortic bioprosthetic valve dysfunction Date issued: 26 June 2019 Research recommendations coming out of this guidance Current evidence on the safety and efficacy of valve-in-valve transcatheter aortic valve implantation (ViV‑TAVI) for aortic bioprosthetic dysfunction is adequate to support the use of this procedure provided that standard arrangements are in place for clinical governance, consent and audit.