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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2001;21:289.)
© 2001 American Heart Association, Inc.

Thrombosis

Familial Clustering of High Factor VIII Levels in Patients With Venous Thromboembolism

C. M. Schambeck; K. Hinney; I. Haubitz; B. Mansouri Taleghani; D. Wahler; F. Keller

From the Central Laboratory and Blood Coagulation Unit, Medical Department (C.M.S., K.H., D.W., F.K.); the Computer Centre (I.H.); and the Department of Transfusion Medicine (B.M.T.), University of Würzburg, Würzburg, Germany.

Correspondence to Dr Christian M. Schambeck, Zentrallabor der Medizinischen Universitätsklinik, Josef-Schneider-Straße 2, 97080 Würzburg, Germany. E-mail c.schambeck{at}medizin.uni-wuerzburg.de

Abstract—High levels of factor VIII (FVIII) but not von Willebrand factor (vWF) are known to increase the risk for venous thromboembolism. Whether high FVIII levels originate from hereditary defects or from acquired conditions remains unanswered. The objective of our study was to investigate whether there is evidence for familial clustering of elevated FVIII levels in families in which 1 member has been affected by a thromboembolic event and had reproducibly high FVIII levels. We investigated FVIII levels in 361 patients with previous venous thromboembolism. FVIII levels were measured by a chromogenic assay; the cutoff value was defined as the 98th percentile of FVIII plasma levels of 266 blood donors. vWF levels were determined by an enzyme immunoassay. After exclusion of known causes of FVIII elevation, such as the acute thrombotic event itself; inflammation; malignancy; liver, renal, or vascular disease; surgery; or pregnancy, we included 17 patients with unexplained, reproducibly high FVIII levels. The investigation was also extended to these patients’ relatives. Multiple regressive analysis of blood donors and asymptomatic family members showed that the affiliation with a family in which 1 member suffered from venous thromboembolism and had reproducibly high FVIII levels is the second most important predictor for FVIII levels. Familial clustering was analyzed by the Houwing-Duistermaat familial aggregation test. After adjustment for the influence of age, sex, blood group, and vWF, FVIII levels were significantly (P=0.038) clustered within families. In conclusion, FVIII levels seem to be familially determined in families in which a member showed high FVIII levels after previous venous thromboembolism.

Key Words: factor VIII • inherited thrombophilia • familial thrombosis • venous thromboembolism

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