An Observational Cross-sectional Study Evaluating the Use of Re-sources and the Sociodemographic and Clinical Characteristics of Patients Diagnosed With Non-valvular Atrial Fibrillation With a Risk of Stroke or Systemic Embolism on Anticoagulant Therapy and Treated in Primary Care Centers

Inclusion Criteria: * Patients ≥18 years of age diagnosed with non-valvular atrial fibrillation with a risk of stroke or systemic embolism treated in primary care centres. * Patients on regular treatment with anticoagulants who have changed their therapeutic regimen due to any clinical situation and have been on treatment with a direct oral anticoagulant for at least three months before being recruited (date of signing the in-formed consent). * Patients whose first direct oral anticoagulant prescription is written by the specialist (cardiologist, haematologist, internist, etc.) and who are followed in primary care. * Patients who have given their informed consent in writing. Exclusion Criteria: * Patients who changed their anticoagulant therapy within a period of less than three months before signing the informed consent. * Patients with cognitive impairment preventing them from understanding what is written in the patient information sheet or the informed consent, or from per-forming the self-administered questionnaires. * Patients who started anticoagulant therapy for non-valvular atrial fibrillation with a direct oral anticoagulant .