Effect of short-term estrogen therapy on endothelial function: a double-blinded, randomized, controlled trial

Area of Science:

• Cardiovascular Science
• Endocrinology
• Women's Health

Background:

• Menopause is associated with increased cardiovascular risk.
• Endothelial dysfunction is an early marker of atherosclerosis.
• Hormone replacement therapy (HRT) is a potential intervention for menopausal symptoms and cardiovascular health.

Purpose of the Study:

• To assess the impact of short-term HRT with conjugated equine estrogens (CEE) on endothelial function in healthy postmenopausal women.
• To evaluate changes in flow-mediated dilation (FMD) of the brachial artery.

Main Methods:

• A 3-year, double-blinded, randomized, placebo-controlled trial.
• 64 healthy postmenopausal women were randomized to receive either 0.625 mg CEE or placebo daily for 28 days.
• Blinded assessment of FMD was performed before and after the 28-day treatment period.

Main Results:

• CEE treatment group showed a significant improvement in FMD (0.011) compared to the placebo group (-0.082) (p=0.025).
• The groups were comparable at baseline for age, BMI, and time since menopause, ensuring homogeneity.
• Participants with chronic vascular conditions, smokers, and sedentary individuals were excluded.

Conclusions:

• Daily administration of 0.625 mg CEE for 28 days effectively improves nitric oxide-dependent vasodilation in postmenopausal women.
• This suggests a beneficial short-term effect of CEE on endothelial function.
• FMD is a reliable measure for assessing HRT's impact on vascular health.