Patients with oral anticoagulation constitute an increasing proportion in the present medical routine.1 The approval of the first direct oral anticoagulant (DOAC) dabigatran by the U.S. food and drug administration in 2010 for the purpose of stroke prevention in patients with non-valvular atrial fibrillation revolutionized the therapy strategies of this entity since the Vitamin-K antagonists (VKA) warfarin, phenprocoumon and acenocoumarol had been the only available oral anticoagulants for decades.