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Antithrombin III activity and other coagulation changes in proliferative diabetic retinopathy.

Antithrombin III, factor VIII, fibrinogen and fibrinolytic activity were measured in two groups of long-standing insulin-dependent diabetic subjects (24 with proliferative retinopathy, 24 without detectable retinopathy) and 24 non-diabetic controls. Mean antithrombin III (+/- 1 SD) was 115.9 (+/- 15.1), 109.8 (+/- 18.1) and 101.4% (+/- 12.5), respectively, in the retinopathy, non-retinopathy and control groups. Statistical significance was obtained when comparing the retinopathy and control groups (p < 0.001) and when comparing all 48 diabetics collectively with controls (p < 0.01). Mean factor VIII coagulant activity was 137.5 (+/- 37.0), 126.2 (+/- 58.2) and 97.0% (+/- 38.7), respectively, in the three groups. Again the differences between all diabetics and controls (p < 0.01) were statistically significant. Similar increases were observed for other modalities of factor VIII activity. Fibrinolytic activity was significantly increased in both diabetic groups but fibrinogen levels, although increased, were not statistically different from levels in controls. It is suggested that the observed changes are more likely to be secondary to the development of retinopathy and that the increase in antithrombin III activity is due to an increase in alpha 2-macroglobulin.