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Mechanisms whereby oestrogens influence arterial health
1Wynn Division of Metabolic Medicine, National Heart and Lung Institute, Imperial College, London, UK.
Insights
Hormone replacement therapy (HRT) significantly reduces coronary heart disease (CHD) risk in postmenopausal women. Estrogen in HRT improves arterial health, lipid profiles, and metabolic factors, lowering overall CHD risk.
Area of Science:
- Cardiovascular Medicine
- Endocrinology
- Women's Health
Background:
- Coronary heart disease (CHD) incidence is lower in premenopausal women than men but increases post-menopause.
- Evidence suggests hormone replacement therapy (HRT) in postmenopausal women reduces CHD incidence by up to 50%.
Purpose of the Study:
- To review the beneficial effects of estrogen on arterial health and cardiovascular risk factors in postmenopausal women.
- To evaluate the role of HRT in reducing CHD risk and its potential use in women with established CHD risk.
Main Methods:
- Review of population-based evidence on HRT and CHD incidence.
- Analysis of estrogen's effects on arterial health, lipid profiles (LDL, HDL, triglycerides), insulin resistance, and fibrinolysis/coagulation.
- Examination of estrogen's direct vascular effects, including endothelium-dependent and calcium-dependent processes.
Main Results:
- Estrogen in HRT demonstrates multifaceted benefits for arterial health.
- HRT favorably alters lipid profiles, improves insulin sensitivity, and influences hemostasis (fibrinolysis/coagulation).
- Estrogen directly enhances vascular function through various mechanisms.
Conclusions:
- HRT offers significant protection against CHD in postmenopausal women by addressing multiple risk factors.
- Estrogen's positive impact on lipids, metabolism, and vascular function contributes to reduced atheroma formation and progression.
- HRT should be considered for postmenopausal women with existing CHD risk factors.
Abstract:
Coronary heart disease (CHD) is uncommon in premenopausal women compared with men of similar age, but its incidence increases after the menopause to reach that of men. There is now good population-based evidence that hormone replacement therapy (HRT) in postmenopausal women reduces the incidence of CHD, perhaps by up to 50%. Oestrogens have a beneficial effect on arterial health in many different ways. HRT may both reduce the risk of atheroma formation and improve arterial function. Depending on the formulation, HRT can lower LDL and triglycerides, and increase HDL. Oestrogen may also produce qualitative as well as quantitative improvements in lipoproteins. It can improve insulin resistance and hence carbohydrate metabolism, and may enhance fibrinolysis rather than coagulation. Thus these effects of HRT on risk factor for CHD will reduce the risk of atheroma development and progression. Oestrogen has direct effects on blood vessels and improves vascular function through various mechanisms including endothelium-dependent and calcium-dependent processes. HRT should therefore now be considered for use in postmenopausal women with established CHD risk.