<qa>  What is limited available information on long term TAVR valve function?There is limited available information on long term TAVR valve function. In this observational study, we will enroll subjects who underwent TAVR or SAVR more than 3 years ago. Clinical and procedural data from the implantsurgery will be collected, alongside clinical and echocardiographic data from subsequent follow-up visits. Up-to-date echocardiography will be performed and analyzed in a Core Lab to assess valve function yearly. 