Inclusion Criteria:  patients with severe aortic Stenosis eligible for transcatheter aortic stenosis left ventricular ejection fraction > 55% no intolerance of Adenosin no history of bradycardia, atrioventricular Blockade intermediate coronary Stenosis with FFR> 0.8 Age >65  Exclusion Criteria:  intolerance of Adenosin left ventricular ejection fraction < 55%