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DOI: 10.1160/TH10-02-0091
Thrombin generation in rheumatoid arthritis: Dependence on plasma factor composition
Financial support: This research was supported by a grant from the Jagiellonian University School of Medicine (no K/ZDS/000565, to A.U.) and an NIH grant HL46703 (Project 5).Publikationsverlauf
Received:
03. Februar 2010
Accepted after minor revision:
12. März 2010
Publikationsdatum:
24. November 2017 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00035024/201002/lookinside/thumbnails/10-1160-th10-02-0091-1.jpg)
Summary
Growing evidence indicates that rheumatoid arthritis (RA) is associated with an increased risk for thromboembolic cardiovascular events. We investigated thrombin generation profiles in RA patients and their dependence on plasma factor/inhibitor composition. Plasma factor (F) compositions (II, V, VII, VIII, IX, X), antithrombin and free tissue factor pathway inhibitor (TFPI) from 46 consecutive RA patients with no cardiovascular events (39 female, 7 male, aged 57 [range, 23–75] years; DAS28 [Disease Activity Score] 5.2 ± 1.1) were compared with those obtained in age- and sex-matched apparently healthy controls. Using each individual’s plasma coagulation protein composition, tissue factor- initiated thrombin generation was assessed both computationally and empirically. RA patients had higher fibrinogen (4.18 [IQR 1.09] vs. 2.56 [0.41] g/l, p<0.0001), FVIII (226 ± 40 vs. 113 ± 15%, p<0.001), PC (107 [16] vs. 100 [14]%, p<0.001), and free TFPI levels (22.3 [2.2] vs. 14.7 [2.1] ng/ml, p<0.001). DAS28, but not age, RA duration, or C-reac- tive protein, was associated with FV, FVIII, FIX, FX, antithrombin, and free TFPI (r from 0.27 to 0.48, p<0.05). Intergroup comparison of computational thrombin generation profiles showed that in RA patients, maximum thrombin levels (p=0.01) and the rate of thrombin formation (p<0.0001) were higher, whereas the initiation phase of thrombin generation (p<0.0001) and the time to maximum thrombin levels (p<0.0001) were longer. Empirical reconstructions of the populations reproduced the thrombin generation profiles generated by the computational model. Simulations of thrombin formation suggest that blood plasma composition, i.e. a marked increase in FVIII, somewhat counterbalanced by free TFPI, contributes to the prothrombotic phenotype in RA patients.
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