 This study aims to assess the quality of oral anticoagulation with vitamin K antagonists, VKAs, in patients with atrial fibrillation, AF, determine the prevalence of poor quality of anticoagulation, and identify factors predisposing to poor quality anticoagulation. Additionally, it seeks to identify patients who will stop oral anticoagulation and investigate what factors influence the decision of oral anticoagulation withdrawal. This article was authored by Jose Miguel Rivera Caravaca, Francisco Maureen, Maria Ascintia and Esteve Pasta, and others.