RecruitingPhase 3Drug trialEfficacy of Atenativ in Patients With Congenital Antithrombin Deficiency Undergoing Surgery or DeliveryThe goal of this study is to assess the incidence of the composite of thrombotic events (TEs) and thromboembolic events (TEEs) in patients with congenital antithrombin deficiency under when they receive Atenativ for surgical procedures or parturition.