title: Plasma levels of thrombin-activatable fibrinolysis inhibitor in primary and secondary thrombocytosis.
abstract: An elevated platelet count is a common finding in both hospitalized and ambulatory patients. Thrombosis and bleeding complications are more frequently observed in patients with clonal thrombocytosis than secondary thrombocytosis. The aim of this study was to investigate the behaviors of thrombin-activatable fibrinolysis inhibitor (TAFI) activity, the inhibitor of fibrinolysis, and also prothrombin time (PT), active partial thromboplastin time, and D-dimer and fibrinogen levels in 21 patients affected with clonal thrombocytemia as compared with 21 patients with reactive thrombocytosis and 21 healthy controls. In the clonal thrombocytemia group, plasma levels of TAFI activity were significantly higher than in both the reactive thrombocytosis and the control group. Plasma levels of leukocyte and platelet counts were significantly higher in the clonal thrombocytemia group than in the other two groups and also higher in the reactive thrombocytosis group than in the control group, which was also significant. Fibrinogen and D-dimer levels were higher in patients than in the control group but showed no significant difference between the clonal and secondary thrombocytosis groups. Plasma levels of PT and aPTT were higher in secondary thrombocytosis group than the clonal thrombocytosis group. The results of this study showed for the first time that TAFI activity is increased in patients with clonal thrombocytosis. These increased levels in clonal thrombocytosis can be considered a factor to explain the thrombotic tendency in myeloproliferative disorders.
authors.affiliation: Fatih University Medical School Department of Internal Medicine, Ankara, Turkey.
authors.forename: O
authors.initials: O
authors.lastname: Kaftan
authors.forename: O S
authors.initials: OS
authors.lastname: Balcik
authors.forename: H
authors.initials: H
authors.lastname: Cipil
authors.forename: G
authors.initials: G
authors.lastname: Ozet
authors.forename: N
authors.initials: N
authors.lastname: Bavbek
authors.forename: A
authors.initials: A
authors.lastname: Koşar
authors.forename: S
authors.initials: S
authors.lastname: Dagdas
mesh_terms: D025901:Carboxypeptidase B2 / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010314:Partial Thromboplastin Time; D011517:Prothrombin Time; D013922:Thrombocytosis / Q000097:blood* / Q000145:classification / Q000473:pathology*
chemical_list: D025901:Carboxypeptidase B2