The need to provide a therapeutic option for patients considered at high surgery risk, has stimulated the development of prosthetic valve implantable with a percutaneous transcatheter techniques. The percutaneous treatment of valvular aortic stenosis has potential advantages in terms of reduction of hospitalization of elderly patients with high risk of peri-operative mortality and morbidity, as well as avoiding treatment with oral anticoagulants. The experience up to now is very positive, with immediate favorable results in terms of hemodynamic and clinical improvement. Since the procedure is at initial stage of clinical application, it becomes necessary a uniform and standardized data collection to assess the effectiveness of the procedure, the incidence of acute and late complications, and the performance of the biological valve prosthesis.