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American Journal of Epidemiology Vol. 152, No. 10 : 897-907
Copyright © 2000 by The Johns Hopkins University School of Hygiene and Public Health


ORIGINAL CONTRIBUTIONS

Clustering of Procoagulation, Inflammation, and Fibrinolysis Variables with Metabolic Factors in Insulin Resistance Syndrome

Pamela A. Sakkinen1, Patricia Wahl2, Mary Cushman1,3, Michael R. Lewis1 and Russell P. Tracy1,4

1 Department of Pathology, College of Medicine, University of Vermont, Burlington, VT.
2 Department of Biostatistics, School of Public Health and Community Medicine, University of Washington, Seattle, WA.
3 Department of Medicine, College of Medicine, University of Vermont, Burlington, VT.
4 Department of Biochemistry, College of Medicine, University of Vermont, Burlington, VT.

The known metabolic cardiovascular disease risk factors associated with insulin resistance syndrome (IRS) do not adequately explain the excess cardiovascular disease risk attributed to this syndrome, and abnormalities in hemostatic variables may contribute to this excess risk. Using data from 322 nondiabetic elderly men and women (aged 65–100 years) participating in the Cardiovascular Health Study during 1989–1990, the authors performed factor analysis on 10 metabolic risk factors associated with IRS and 11 procoagulation, inflammation, and fibrinolysis variables to examine the clustering of the metabolic and hemostatic risk markers. Factor analysis of the metabolic variables confirmed four uncorrelated factors: body mass, insulin/glucose, lipids, and blood pressure. Adding the hemostatic variables yielded three new factors interpreted as inflammation, vitamin K-dependent proteins, and procoagulant activity. Plasminogen activator inhibitor-1 clustered with the body mass factor, supporting the hypothesis that obesity is related to impaired fibrinolysis. Fibrinogen clustered with the inflammation summary factor rather than procoagulant activity, supporting the position that fibrinogen principally reflects underlying inflammation rather than procoagulant potential. The authors conclude that should hemostatic variables be shown to contribute to IRS-related cardiovascular disease, apart from plasminogen activator inhibitor-1, they may do so independently of the established metabolic abnormalities. Am J Epidemiol 2000;152:897–907.

aged; aged, 80 and over; factor analysis; statistical; hemostasis; inflammation; insulin resistance; metabolism; multivariate analysis

Abbreviations: CV, coefficient of variation; PAI-1, plasminogen activator inhibitor-1; VKDP, vitamin K-dependent protein


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