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Related Experiment Videos

Long-term hormone replacement therapy does not cause increased platelet activation.

Marlene S Williams1, Dhananjay Vaidya, Thomas Kickler

  • 1Department of Medicine, Johns Hopkins Medical Institute, Baltimore, MD, USA. mswillia@jhmi.edu

American Heart Journal
|September 20, 2005
PubMed
Summary

Long-term hormone replacement therapy (HRT) did not increase platelet activation or aggregation in postmenopausal women with coronary artery disease. Early HRT initiation effects on platelet function remain unassessed.

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Area of Science:

  • Cardiovascular Science
  • Endocrinology
  • Hematology

Background:

  • Observational studies suggested reduced ischemic coronary disease risk with hormone replacement therapy (HRT) in postmenopausal women.
  • Recent studies indicated increased ischemic cardiac events with HRT initiation in women with existing coronary artery disease.
  • Estrogen's potential role in increasing platelet aggregation was postulated.

Purpose of the Study:

  • To evaluate the effect of long-term hormone replacement therapy (HRT) on platelet activation and aggregation in postmenopausal women with coronary artery disease.
  • To investigate whether HRT influences platelet function markers, specifically P selectin and PAC1 expression and platelet-rich plasma aggregation.
  • To assess platelet function in women on HRT for over two years compared to a placebo group.

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Main Methods:

  • Platelet activation was measured using flow cytometry with P selectin and PAC1 as markers.
  • Platelet aggregation was assessed via standard methods in platelet-rich plasma.
  • The study included 27 postmenopausal women from two placebo-controlled angiographic trials, with 17 on HRT and 10 on placebo, all on aspirin therapy.

Main Results:

  • No significant differences were observed in platelet aggregation between the HRT and placebo groups across various agonist doses.
  • Flow cytometry analysis revealed comparable levels of platelet activation between women receiving HRT and those on placebo.
  • These findings suggest long-term HRT does not elevate platelet activation or aggregation in this patient population.

Conclusions:

  • Long-term hormone replacement therapy (HRT) does not appear to increase platelet activation and aggregation in postmenopausal women with coronary artery disease.
  • The study did not assess potential transient increases in platelet activation during the early period of HRT initiation.
  • Further research may be needed to clarify the acute effects of HRT initiation on platelet function.