Hemostatic risk factors have been well established in coronary artery disease but less well studied in peripheral vascular disease. The relationship of coagulation and fibrinolytic proteins to lower limb arterial occlusive disease and other vascular risk factors remains poorly defined. Fibrinogen, factor VII coagulant activity, von Willebrand factor (vWf) antigen, and plasminogen activator inhibitor-1 (PAI-1) activity were measured in 46 adult participants in the Arterial Disease Multiple Intervention Trial (ADMIT) and in 76 control subjects and related to ankle-brachial systolic pressure index (ABI), a measure of lower limb arterial stenosis. The primary inclusion criterion for the ADMIT study population was an average of two ABIs <0.85. Fibrinogen and PAI-1 in ADMIT subjects were significantly higher than in control subjects (331 +/- 52 mg/dl vs 273 +/- 46 mg/dl, p < 0.0001; 18.7 +/- 10 units/ml vs 13.5 +/- 8.9 units/ml, p < 0.04). There were significant correlations of fibrinogen with ABI, factor VII coagulant activity, and systolic and diastolic blood pressures; PAI-1 with body mass index and age; and factor VII coagulant activity with cholesterol levels. Logistic regression analysis, considering hemostatic variables and several known nonhemostatic risk factors of peripheral arterial disease, showed that fibrinogen and systolic blood pressure were independently associated with ABI status in this population. The results demonstrate a strong independent correlation between fibrinogen levels and the presence of lower limb arterial stenosis. PAI-1 levels were elevated in ADMIT participants, but multivariate analysis did not demonstrate an independent relationship between PAI-1 and ABI.
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