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Related Experiment Video

Updated: Apr 19, 2026

Leveraging Turbidity and Thromboelastography for Complementary Clot Characterization
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Monitoring bypassing agent therapy - a prospective crossover study comparing thromboelastometry and thrombin

H T T Tran1,2,3, B Sørensen4, S Bjørnsen1

  • 1Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway.

Haemophilia : the Official Journal of the World Federation of Hemophilia
|December 19, 2014
PubMed
Summary

Thromboelastometry (ROTEM) and thrombin generation assay (TGA) can monitor bypassing agent (BPA) therapy in hemophilia A patients with inhibitors. TGA showed greater sensitivity than ROTEM in differentiating treatment responses between activated prothrombin complex concentrates (aPCC) and recombinant FVIIa (rFVIIa).

Keywords:
ROTEMTGAaPCChaemophilia AinhibitorsrFVIIa

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Area of Science:

  • Hematology
  • Coagulation studies
  • Hemophilia research

Background:

  • Hemophilia A patients with inhibitors require effective bypassing agent (BPA) therapy.
  • Monitoring treatment response is crucial for optimizing patient outcomes.
  • Thromboelastometry (ROTEM) and thrombin generation assay (TGA) are potential tools for monitoring BPA therapy.

Purpose of the Study:

  • To evaluate the capability of ROTEM and TGA in monitoring BPA therapy response in hemophilia A patients with inhibitors.
  • To compare the sensitivity of ROTEM and TGA in reflecting treatment differences between activated prothrombin complex concentrates (aPCC) and recombinant FVIIa (rFVIIa).

Main Methods:

  • Prospective crossover study involving six hemophilia A patients with inhibitors.
  • Patients received aPCC and rFVIIa sequentially, with blood sampling at multiple time points post-infusion.
  • TGA and ROTEM analyses were performed on collected blood samples; healthy subjects served as controls.

Main Results:

  • TGA parameters (endogenous thrombin potential and peak thrombin) significantly increased post-infusion, indicating enhanced thrombin generation.
  • ROTEM parameters (MaxVel and maximum clot firmness) also increased, reaching levels comparable to healthy controls.
  • TGA demonstrated a greater response to aPCC compared to rFVIIa, while ROTEM showed no significant difference between the two agents.

Conclusions:

  • Both ROTEM and TGA show potential for evaluating BPA therapy effectiveness in hemophilia patients with inhibitors.
  • TGA appears more sensitive than ROTEM in distinguishing the hemostatic effects of different BPAs, specifically aPCC versus rFVIIa.
  • Further clinical studies are warranted to determine the predictive value of specific assay parameters for clinical outcomes.