TE: Thromboembolism AVR: Aortic Valve Replacement BHV: Biological Heart Valves MHV: Mechanicalheart Valves VKA:Vitamin K Antagonists AF: Atrial Fibrillation CVA: Cerebrovascular Accident TAVI: Trans-catheter Valve Implantation MRI:Magnetic Resonance Imaging TIA: Transient Ischemic Attack VARC: Valve