Observational Study:Safety,Efficacy and Quality of Life of Patients With Atrial Fibrillation, Treated With Trombix®

Inclusion Criteria: * Patient, male or female, aged ≥ 19 years. * Patient with a diagnosis of atrial fibrillation who requires treatment with Trombix® or switch of Anti-Vitamin K treatment toTrombix® (patient not balanced with current treatment or wishing to change treatment with better manageability). * Patient being able to provide free and informed written consent before the study. Exclusion Criteria: * Hypersensitivity to the active ingredient or to one of the excipients indicated in the Summary of Product Characteristics of Trombix® * Clinically significant progressive bleeding. * Injury or illness, if considered to be at significant risk of major bleeding. This may include: current or recent gastrointestinal ulceration, presence of malignant tumors with a high risk of bleeding, recent brain, spinal or ophthalmic surgery, recent intracranial hemorrhage, known or suspected esophageal varices, arteriovenous malformations, vascular aneurysms or major intra-spinal or intracerebral vascular anomalies. * Concomitant treatment with any other anticoagulant, for example, unfractionated heparin (UFH), low molecular weight heparins (enoxaparin, dalteparin, etc.), heparin derivatives (fondaparinux, etc.), oral anticoagulants (warfarin, dabigatran exilate, apixaban, etc.) except in specific circumstances of switching from anticoagulant treatment or in the case of administration of UFH at doses necessary to maintain the permeability of a central venous or arterial catheter. * Liver injury associated with coagulopathy and clinically significant bleeding risk, including cirrhotic patients with Child Pugh score class B or C. * Pregnancy and breast feeding