Due to issues of limited validity of the KCCQ for TAVI / SAVR (Surgical Aortic Valve Replacement) patients related to symptom items not being revised from their original use for congestive heart failure, a new original HR-QoL questionnaire was proposed: The "Toronto Aortic Stenosis Quality of Life Questionnaire" (TASQ) is a health specific measurement tool designed to measure changes in quality of life in aortic stenosis patients. The aim of this study is to validate this questionnaire in this specific patient population.