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Combination Estrogen and Progestogen Replacement Therapy Does Not Adversely Affect Coagulation

Center for Climacteric Studies, Department of Obstetrics and Gynecology, Department of Medicine, College of Medicine, University of Florida, Gainesville, Florida.

Abstract

Coagulation and fibrinolysis profiles of naturally menopausal women receiving conjugated estrogens (0.625 or 1.25 mg for 21 of 28 days) and medroxyprogesterone acetate (10 mg for seven of 28 days) for 18 months were compared with those of similar women receiving no hormone therapy. Tests indicative of the dynamics of the coagulation cascade, ongoing intravascular coagulation, and anticoagulation were performed. Hormone therapy had no effect on prothrombin times, activated partial thromboplastin times, or thrombin times. There was no evidence of intravascular coagulation in any of the groups as assessed by platelet counts, fibrinogen antigen and activity, and fibrin degradation products. Anti-thrombin III antigen and activity, ₁-antitrypsin antigen, and ₂macroglobulin antigen, the natural inhibitors of coagulation, were also unaffected by hormone therapy. Plasminogen antigen levels were unaffected, but plasminogen activity was enhanced in the hormone-treated groups, suggesting a stimulatory effect on fibrinolysis. These data indicate that in terms of the coagulation system, healthy women can safely use a combined regimen of conjugated estrogens and medroxyprogesterone acetate.

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