Evaluation of recombinant activated factor VII, prothrombin complex concentrate, and fibrinogen concentrate to reverse apixaban in a rabbit model of bleeding and thrombosis.

As all anticoagulants, apixaban exposes to a bleeding risk, thus an effective way to reverse its effects is needed. Objectives were to study efficacy and safety of recombinant activated factor VII (rFVIIa), prothrombin complex concentrate (PCC), and fibrinogen concentrate (Fib) to reverse apixaban in a rabbit model of bleeding and thrombosis. After a dose-ranging study to assess the minimal amount of apixaban increasing bleeding, 63 anaesthetized rabbits were randomized into 5 groups: control (saline), apixaban (apixaban and saline), rFVIIa (apixaban and rFVIIa), PCC (apixaban and PCC) and fibrinogen (apixaban and Fib). The Folts model was applied: a stenosis and an injury were carried out on the carotid artery, inducing thrombosis detected as cyclic flow reductions (CFRs) within 20 min. A number of parameters were recorded through ear immersion bleeding time (BT), clotting times (CT), thrombelastography, and thrombin generation time (TGT). Ultimately, a hepatosplenic section was performed to evaluate as primary endpoint the blood loss in 15 min. Apixaban increased blood loss (11.6 ± 3 g vs. 8.3 ± 3 g for control, p < 0.0003), lengthened BT, the prothrombin time (PT), thrombelastographic CT and decreased thrombin generation. Only rFVIIa reduced BT yet failed to improve blood loss. PCC and rFVIIa both shortened the PT, CT in thrombelastographic, and lag time in TGT. Fib improved clot firmness, enhanced thrombin generation but increased bleeding. Regarding safety, neither rFVIIa, PCC, nor Fib increased CFRs. rFVIIa, PCC, and Fib failed to reverse apixaban-induced bleeding. They only improved several laboratory parameters.

Martin AC ，Le Bonniec B ，Fischer AM ，Marchand-Leroux C ，Gaussem P ，Samama CM ，Godier A ... -  《-》

Evaluation of prothrombin complex concentrate and recombinant activated factor VII to reverse rivaroxaban in a rabbit model.

Godier A ，Miclot A ，Le Bonniec B ，Durand M ，Fischer AM ，Emmerich J ，Marchand-Leroux C ，Lecompte T ，Samama CM ... -  《-》

Recombinant activated factor VII and prothrombin complex concentrates have different effects on bleeding and arterial thrombosis in the haemodiluted rabbit.

Le Saché F ，Le Bonniec B ，Gaussem P ，Dizier B ，Tagzirt M ，Godier A ，Emmerich J ，Samama CM ... -  《-》

Efficacy of prothrombin complex concentrate to reverse the anticoagulant effect of the pentasaccharide fondaparinux in a rabbit model.

Godier A ，Durand M ，Emmerich J ，Dizier B ，Lecompte T ，Samama CM ... -  《-》

Recombinant activated factor VII efficacy and safety in a model of bleeding and thrombosis in hypothermic rabbits: a blind study.

Godier A ，Mazoyer E ，Cymbalista F ，Cupa M ，Samama CM ... -  《-》