Circle Method Observational Project - Non-interventional, Retrospective, Multicenter Data Collection

The goal of this non-interventional, retrospective data analysis is to validate the circle method for patients with bicuspid aortic heart valves undergoing transcatheter aortic heart valve implantation (TAVI). The main aims are: * to assess whether patients with bicuspid aortic valves that received a TAVI suffered from fewer complications * if valve size was identical to the one determined using the circle method compared to * a case where circle method derived valve size is different from the actually implanted valve * to develop recommendations on how to size the valve using the circle method.