Transcatheter Aortic Valve Implantation in Patients With Pre-Existing Mechanical Mitral Valve Prostheses.

Objectives. Transcatheter aortic valve implantation [TAVI] has become standard therapy for aortic stenosis patients with intermediate or high operative risk. Treatment of patients with pre-existing mechanical mitral valve replacement [MVR] is challenging due to possible interference between the TAVI prosthesis and MVR. We present our single-center experience with this special patient cohort. Methods. A total of 1960 patients underwent TAVI at our institution between 2009 and March 2018: of these, 16 patients had pre-existing mechanical MVR. Device success and adverse events were analyzed according to the Valve Academic Research Consortium (VARC]-2 criteria. Patients were followed for at least 12 months. Results. Mean patient age was 81.5 +/- 4.4 years. The patients had a mean logistic EuroScore of 37.1 +/- 13.5% and STS score of 7.1 +/- 3.2%. Successful valve deployment was achieved in all patients, peri-interventional stroke rate was 0.0%, and permanent pacemaker was implanted in 2 patients (12.5%]. Two patients experienced major complications, with blockage of the MVR disc in 1 patient and annulus rupture in 1 patient. Hence, 30-day mortality was 12.5% and 1-year mortality was 25.0%. Conclusion. TAVI in patients with mechanical MVR is challenging and requires careful preparation and choice of TAVI device. Repositionable and retrievable devices seem to be a safer option.