 At the inclusion, clinical baseline and electrocardiographic data will be collected. During the procedure, baseline ECG data as well as conduction disorders will be recorded. An EP study will be performed measure of AH and HV intervals before and after TAVI. Aortic surface area, transvalvular mean gradient, presence of periprothetic leak and LV ejection fraction will be determined by echocardiography within the first 24 hours. 