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  • Title: Recurrence rate after a first venous thrombosis in patients with familial thrombophilia.
    Author: Vossen CY, Walker ID, Svensson P, Souto JC, Scharrer I, Preston FE, Palareti G, Pabinger I, van der Meer FJ, Makris M, Fontcuberta J, Conard J, Rosendaal FR.
    Journal: Arterioscler Thromb Vasc Biol; 2005 Sep; 25(9):1992-7. PubMed ID: 15976329.
    Abstract:
    OBJECTIVE: Few comprehensive data are available on the recurrence rate of venous thrombosis in carriers of thrombophilic defects from thrombophilic families. We prospectively determined the recurrence rate after a first venous thrombotic event in patients with familial thrombophilia attributable to factor V Leiden or deficiencies of protein C, S, or antithrombin. METHODS AND RESULTS: Data were gathered during follow-up on the occurrence of risk situations, anticoagulation treatment, and events (eg, venous thrombosis, hemorrhage). Over a mean follow-up period of 5.6 years, 44 of the 180 patients with familial thrombophilia who did not use long-term anticoagulation experienced a recurrent venous thromboembolic event (5.0%/year; 95% CI 3.6 to 6.7) compared with 7 of the 124 patients on long-term anticoagulation (1.1%/year; 95% CI 0.4 to 2.2). Spontaneous events occurred less often in patients on long-term anticoagulation (57%) than in patients without long-term anticoagulation (75%). The highest recurrence rate was found among men with a deficiency in natural anticoagulants or multiple defects and women with antithrombin deficiency. Although long-term anticoagulation treatment decreased the incidence of recurrent events by 80%, it also resulted in a risk of major hemorrhage of 0.8% per year. CONCLUSIONS: Extra care after a first event is required for men with a deficiency in natural anticoagulants or multiple defects and women with antithrombin deficiency.
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