An Investigator-initiated Linked Study to OCEANIC-AF

"GTT~The Global Thrombosis Test (GTT) (Thromboquest Limited, UK) is an in vitro method imitating high shear stress conditions akin to that which exist in a severely stenosed artery. The test measures platelet reactivity (occlusion time) and endogenous fibrinolysis time (lysis time).~TEG Thromboelastography (TEG, Haemonetics Corporation, USA) is a technique that assesses the whole process of clotting and its viscoelastic properties, from the initial activation and aggregation of platelets, to the role of thrombin and finally the stability of the formed clot, as a measure of fibrinolytic resistance.~Citrated plasma will be stored for subsequent evaluation of thrombosis and fibrinolysis markers (including but not restricted to D-dimer, PAI-1, hs-CRP, NETs)"