title: The endogenous thrombin potential and high levels of coagulation factor VIII, factor IX and factor XI.
abstract: High plasma concentrations of factor VIII, factor IX and factor XI have been reported as thrombosis risk factors. Using the thrombin generation test in platelet-poor plasma, it was aimed to describe the mechanism for this increased thrombosis risk. Endogenous thrombin potential was measured in platelet-poor plasma in 180 patients with a history of thromboembolism, and results were compared with those of 180 age-matched and sex-matched controls. Subjects with major hereditary and acquired thrombophilia were excluded. Plasma concentrations of the clotting factor VIII, factor IX and factor XI were significantly elevated in patients compared with controls. The mean endogenous thrombin potential was significantly higher in patients than in controls: 191.3 +/- 3.1 (95% confidence interval, 185.3-197.4) arbitrary units versus 180.8 +/- 2.6 (95% confidence interval, 175.7-185.9) arbitrary units (P = 0.009). The endogenous thrombin potential was significantly higher in patients with elevated factor IX and factor XI, but elevated factor VIII was not associated with a significant increase in endogenous thrombin potential. In conclusion, the increased thrombosis risk associated with high plasma concentrations of factor IX and factor XI may be explained by the increase in endogenous thrombin potential. However, this did not help explain the association between elevated factor VIII and thrombosis risk.
authors.affiliation: Clinical Hemostaseology, Medical ICU and Department of Pneumology, University of Leipzig, Germany.
authors.forename: Annelie
authors.initials: A
authors.lastname: Siegemund
authors.forename: Sirak
authors.initials: S
authors.lastname: Petros
authors.forename: Thomas
authors.initials: T
authors.lastname: Siegemund
authors.forename: Ute
authors.initials: U
authors.lastname: Scholz
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Seyfarth
authors.forename: Lothar
authors.initials: L
authors.lastname: Engelmann
mesh_terms: D000328:Adult; D001779:Blood Coagulation Factors / Q000032:analysis*; D001780:Blood Coagulation Tests; D016022:Case-Control Studies; D005164:Factor IX / Q000032:analysis; D005167:Factor VII / Q000032:analysis; D005172:Factor XI / Q000032:analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D012306:Risk; D013917:Thrombin / Q000096:biosynthesis*; D013927:Thrombosis / Q000097:blood / Q000209:etiology
chemical_list: D001779:Blood Coagulation Factors; D005167:Factor VII; D005164:Factor IX; D005172:Factor XI; D013917:Thrombin