Elevation of factor VII activity and mass in young adults at risk of ischemic heart disease

Department of Medicine, State University of New York, Stony Brook.

The Northwick Park Heart Study found that elevation of factor VII in middle-aged subjects was an independent risk factor for subsequent ischemic heart disease. The present study was designed to determine whether factor VII elevation is present at a younger age and whether zymogen or activated factor VII is responsible for this elevation. A group of 20 asymptomatic first degree relatives (mean age 34.9 years) of patients with premature ischemic heart disease were compared with 15 age-matched normal subjects at low risk of ischemic heart disease and 15 older subjects with established ischemic heart disease (mean age 49.7 years). Factor VII procoagulant, coupled amidolytic and antigenic assays, as well as fasting serum triglyceride and cholesterol assays, were performed on all three groups. Factor VII antigen and coagulant activity was significantly elevated in first degree relatives, as was factor VII antigen in the patients with ischemic heart disease. The increased factor VII level in these subjects was caused by elevated factor VII zymogen, not activated factor VII. The results of this study, combined with those of previous studies, suggest that factor VII may be a useful additional marker of the risk for ischemic heart disease and merits further investigation.

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