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Original Article
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Volume 343:457-462 August 17, 2000 Number 7
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High Plasma Levels of Factor VIII and the Risk of Recurrent Venous Thromboembolism
Paul A. Kyrle, M.D., Erich Minar, M.D., Mirko Hirschl, M.D., Christine Bialonczyk, M.D., Milena Stain, M.D., Barbara Schneider, Ph.D., Ansgar Weltermann, M.D., Wolfgang Speiser, M.D., Klaus Lechner, M.D., and Sabine Eichinger, M.D.

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ABSTRACT

Background A high plasma level of factor VIII is a risk factor for venous thromboembolism. We evaluated the risk of a recurrence of thrombosis after an initial episode of spontaneous venous thromboembolism among patients with high plasma levels of factor VIII.

Methods We studied 360 patients for an average follow-up period of 30 months after a first episode of venous thromboembolism and discontinuation of oral anticoagulants. Patients who had recurrent or secondary venous thromboembolism, a congenital deficiency of an anticoagulant, the lupus anticoagulant, hyperhomocysteinemia, cancer, or a requirement for long-term treatment with antithrombotic drugs or who were pregnant were excluded. The end point was objectively documented, symptomatic recurrent venous thromboembolism.

Results Recurrent venous thromboembolism developed in 38 of the 360 patients (10.6 percent). Patients with recurrence had higher mean (±SD) plasma levels of factor VIII than those without recurrence (182±66 vs. 157±54 IU per deciliter, P=0.009). The relative risk of recurrent venous thrombosis was 1.08 (95 percent confidence interval, 1.04 to 1.12; P<0.001) for each increase of 10 IU per deciliter in the plasma level of factor VIII. Among patients with a factor VIII level above the 90th percentile of the values in the study population, the likelihood of recurrence at two years was 37 percent, as compared with a 5 percent likelihood among patients with lower levels (P<0.001). Among patients with plasma factor VIII levels above the 90th percentile, as compared with those with lower levels, the overall relative risk of recurrence was 6.7 (95 percent confidence interval, 3.0 to 14.8) after adjustment for age, sex, the presence or absence of factor V Leiden or the G20210A prothrombin mutation, and the duration of oral anticoagulation.

Conclusions Patients with a high plasma level of factor VIII have an increased risk of recurrent venous thromboembolism.


Source Information

From the Department of Internal Medicine I, Division of Hematology and Hemostasis (P.A.K., M.S., A.W., K.L., S.E.), the Department of Internal Medicine II, Division of Angiology (E.M.), the Department of Medical Statistics (B.S.), and the Clinical Institute of Medical and Chemical Laboratory Diagnostics (W.S.), Vienna University Hospital; Hanuschkrankenhaus (M.H.); and Wilhelminenspital (C.B.) — all in Vienna, Austria.

Address reprint requests to Dr. Kyrle at the Allgemeines Krankenhaus Wien, Klinik für Innere Medizin I, Abteilung für Hämatologie und Hämostaseologie, Währinger Gürtel 18–20, A-1090 Vienna, Austria, or at paul.kyrle{at}akh-wien.ac.at.

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High Plasma Levels of Factor VIII and the Risk of Recurrent Venous Thromboembolism
Hari P., Chemiti G. K. P., Lankipalli R. S., Kyrle P. A., Eichinger S.
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N Engl J Med 2000; 343:1968-1969, Dec 28, 2000. Correspondence

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