Abstract
Objective To examine the relationship of estrogen-induced changes in lipids and lipoproteins with alterations in the coagulation system. Methods Coagulation and lipid indices were measured in 31 postmenopausal women, ages 40–60 years, after a 3-month course of 0.625-mg conjugated equine estrogen. We analyzed changes in variables from baseline to 3 months using t tests for paired samples or the Wilcoxon matched-pairs signed-rank test. Results Unopposed estrogen replacement therapy produced statistically significant decreases in antithrombin-III antigen (P = .006) and activity (P = .001) and total protein S (P = .003) and a significant increase in protein C antigen (P = .017). C4b-binding protein also decreased significantly from baseline to 3 months (P Conclusions Although several estrogen-induced changes may decrease atherosclerotic potential and hypercoagulability, others may promote coagulability. These divergent effects may be manipulated pharmacologically by other estrogen compounds or by the addition of various progestins.
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