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Background  Venous thromboembolism ( VTE ) is associated with significant morbidity and mortality.    Objectives  We investigated the impact of direct and  AT ‐dependent  FX a or thrombin inhibitors on thrombus formation.    Methods  Whole blood thromboelastometry and thrombin generation were assessed after triggering the  TF  pathway. Clinically relevant concentrations of rivaroxaban, fondaparinux, dabigatran or tinzaparin and an association of rivaroxaban and dabigatran were examined.    Results  All agents delayed thrombus formation in a concentration‐dependent manner, as documented by the prolongation of the clotting time ( CT ) and clot formation time ( CFT ). Rivaroxaban did not significantly alter the α‐angle or maximum clot firmness ( MCF ). In contrast, dabigatran and fondaparinux altered the process of clot structure by decreasing the α‐angle, but did not modify clot firmness. The later property was significantly affected only by tinzaparin that also reduced the  MCF . The association of rivaroxaban and dabigatran did not affect the  MCF , although it amplified the effect on  CFT  and α‐angle.    Conclusions  All agents delayed thrombus formation. However, the compounds differed substantially with respect to fibrin polymerization rate and clot firmness. Comparison of the data obtained by thrombin generation assessment with those obtained by the thromboelastometric study shows that the delay in clot formation is principally associated with prolongation of the initiation phase of thrombin formation as well as a reduction of the propagation phase. Tinzaparin was much more potent than the other agents both with regard to suppression of thrombin generation and by delay in clot formation.

Comparison of antithrombin‐dependent and direct inhibitors of factor Xa or thrombin on the kinetics and qualitative characteristics of blood clots