Novel hemostatic factor levels and risk of ischemic stroke: The atherosclerosis risk incommunities (ARIC) study

M. Fareed K Suri, Kazumasa Yamagishi, Nena Aleksic, Peter J. Hannan, Aaron R. Folsom

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Background and Objective: The role of hemostatic factor levels in cerebral infarction remains uncertain. We studied the association of levels of several under-studied hemostatic factors with ischemic stroke in a population-based cohort. Methods: The Atherosclerosis Risk in Communities (ARIC) study includes 15,792 individuals aged 45-54 years at intake. Hemostatic factors II, V, IX, X, XI, XII, plasminogen and α2-antiplasmin were measured on frozen citrate plasma samples from 1990 to 1992. A case-cohort design was used, including all incident ischemic strokes (n = 89) over a median of 7.5 years and a stratified cohort random sample (n = 412). To determine the association of hemostatic factors with incident ischemic stroke, we computed hazard ratios (HRs) using multivariate proportional hazard regression analyses adjusted for demographic and other cardiovascular risk factors. Results: The cohort random sample had a mean age (SD) of 56.9 (5.4) years and 42% were men. The age-, sex- and race-adjusted HRs for highest versus lowest quartiles were: factor XI (2.74, 95% CI 1.42-5.29), factor IX (1.92, 95% CI 0.99-3.73), and α2- antiplasmin (2.24, 95% CI 1.16-4.33). Correspondingly, the HRs of ischemic stroke per SD increment of factors XI, IX, and α2-antiplasmin were 1.64, 1.46 and 1.52, respectively (all p < 0.05). After multivariate adjustment including other clinical variables, the standardized HR remained significant for factor XI (1.50, 95% CI 1.10-2.05), but no other factor. Conclusion: A greater level of factor XI was associated with an increased risk of ischemic stroke. Higher factor XI levels might help identify patients at elevated ischemic stroke risk.

Original languageEnglish (US)
Pages (from-to)497-502
Number of pages6
JournalCerebrovascular Diseases
Volume29
Issue number5
DOIs
StatePublished - Apr 2010

Keywords

  • Coagulation
  • Risk factors
  • Stroke

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