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In vitro studies using a global hemostasis assay to examine the anticoagulation effects in plasma by the direct thrombin inhibitors: dabigatran and argatroban.
MedLine Citation:
PMID:  22843196     Owner:  NLM     Status:  Publisher    
This study aimed to assess whether a global hemostatic assay we developed can measure the anticoagulant effects of the direct thrombin inhibitors (DTIs)-dabigatran and argatroban. A normal plasma pool (NPP) spiked with one of the DTIs and five plasma samples from patients with coronary heart disease spiked with dabigatran were examined. Fibrin formation and fibrin degradation were initiated by adding recombinant tissue factor (together with washed-frozen-thawed platelets and CaCl(2)) and recombinant tissue plasminogen activator. Fibrin optical density (OD) was recorded, based on which coagulation activation profile (Cp) and fibrinolysis activation profile (Fp) were determined. Moreover, the sum of OD values registered over time (fibrin OD-sum) was calculated to reflect the capacity of fibrin formation under the general effect by Cp and Fp. The endogenous thrombin potential (ETP) and the standard clotting markers i.e., activated partial thromboplastin time (APTT) and prothrombin time expressed as International Normalized Ratio (INR) were also analyzed. Results demonstrated that APTT, INR and ETP could detect the effects of the DTIs except for INR in NPP containing dabigatran. In our global assay, the DTIs depressed the fibrin formation (shown as decreased fibrin OD-sum value) by leading to decrease of Cp and increase of Fp. Thus, our global assay which examines both fibrin formation and degradation seems more advantageous than the other methods mentioned above, as regards the possibility of being a laboratory tool to monitor the antithrombotic therapy with DTIs.
Shu He; Håkan Wallèn; Niklas Bark; Margareta Blombäck
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-29
Journal Detail:
Title:  Journal of thrombosis and thrombolysis     Volume:  -     ISSN:  1573-742X     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9502018     Medline TA:  J Thromb Thrombolysis     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Clinical Sciences at Danderyds Hospital, Karolinska Institutet, Stockholm, Sweden,
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