Specific Anti Factor Xa Activity Dosage to Enhance Detection of Nonadherence in Atrial Fibrillation Patients

Direct oral anticoagulants (DOAC), an inhibitor of factor IIa (dabigatran) or factor Xa inhibitors (rivaroxaban, apixaban) are an alternative to treatment with warfarin in patients with atrial fibrillation (AF) non-valvular . These molecules have demonstrated non-inferiority compared to warfarin standard treatment for the prevention of thromboembolic events in patients with non-valvular AF at high risk thomboembolique (Score CHA2DS2-VASc ≥1). These molecules have a constant biological effectiveness does not require laboratory monitoring in clinical practice, unlike AVK whose use requires, because of their variability action intra- and inter-individual, a constant dose adjustment based on 'Nationalized Index Ratio (INR). The objective of this study is to evaluate the interest of specific dosage of anti-activated factor X activity (Xa) in the identification of non-observing treating patients with Factor Xa inhibitor in patients with non-FA valvular