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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2005;25:2043.)
© 2005 American Heart Association, Inc.

Brief Reviews

Assessment of Hemostatic Risk Factors in Predicting Arterial Thrombotic Events

David Feinbloom; Kenneth A. Bauer

From the Department of Medicine, Beth Israel Deaconess Medical Center (D.F., K.A.B.), and VA Boston Healthcare System (K.A.B.), Harvard Medical School, Boston, Mass.

Correspondence to Kenneth A. Bauer, MD, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Ave, Boston, MA 02115. E-mail kbauer{at}bidmc.harvard.edu

Series Editor: William Haynes
ATVB In Focus Noninvasive Assessment of Atherosclerosis: From Structure to Function

Previous Brief Reviews in this Series:

•Choudhury RP, Fuster V, Badimon JJ. Fisher EA, Fayad ZA. MRI and characterization of atherosclerotic plaque: emerging applications and molecular imaging. 2002;22:1065–1074.
•Bonetti PO, Lerman LO, Lerman A. Endothelial dysfunction: a marker of atherosclerotic risk. 2003;23:168–175.
•Oliver JJ, Webb DJ. Noninvasive assessment of arterial stiffness and risk of atherosclerotic events. 2003;23:554–566.
•Madjid M, Zarrabi A, Litovsky S, Willerson JT, Casscells W. Finding vulnerable atherosclerotic plaques: is it worth the effort? 2004;24:1775–1782.
•Morrow JD. Quantification of isoprostanes as indices of oxidant stress and the risk of atherosclerosis in humans. 2005;25:279–286.

Arterial thrombosis results from endovascular injury and, to a lesser extent, alterations in hemostatic equilibrium. Although multiple hereditary and acquired hemostatic risk factors have been described in the pathophysiology of venous thrombosis, the degree and type of abnormalities that contribute to arterial thrombosis are less well understood. Endothelial cell injury with the elaboration of proinflammatory mediators stimulates the process of arterial thrombosis. Although this is most often the result of endovascular injury attributable to atherosclerotic disease, other disease states can elicit a similar response as well. Similarly, once thrombosis has been initiated, variations in the activity of coagulation proteins and endogenous anticoagulants, as well as the kinetics of platelet aggregation, may alter the effectiveness of thrombus formation. Epidemiological studies have identified several acquired or inherited states that may result in endothelial damage or altered hemostatic equilibrium, thereby predisposing patients to arterial thrombosis. These include hyperhomocysteinemia, elevated C-reactive protein, antiphospholipid antibodies, elevated fibrinogen, Factor VII, plasminogen activator inhibitor-1 (PAI-1), hereditary thrombophilias, and platelet hyper-reactivity. This review explores our present understanding of these risk factors in the development of arterial thrombotic events. At present, the literature supports a role for hyperhomocysteinemia, elevated C-reactive protein, and elevated fibrinogen as risk factors for arterial thrombosis. Similarly, the literature suggests that lupus anticoagulants and, to a lesser extent, elevated titers of cardiolipin IgG antibodies predispose to arterial vascular events. In certain subsets of patients, including those with concomitant cardiac risk factors, <55 years of age, and women, hereditary thrombophilias such as carriership of the factor V Leiden and the prothrombin G20210A mutations may confer a higher risk of arterial thrombosis. However, the data on Factor VII, PAI-1, and platelet receptor polymorphisms are contradictory or lacking.

Key Words: arterial • thrombosis • atherosclerosis • hemostasis • risk factors

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