HRT Reduces Cardiovascular Risk, but Long-Term Use Raises Concerns

Hormone replacement therapy (HRT) is a common treatment for menopause symptoms, but it comes with both benefits and risks. Hot flashes and night sweats, known as vasomotor symptoms, affect up to 80% of women during menopause and can last for 7 to 10 years. These symptoms often worsen as perimenopause progresses and peak in early post-menopause, making them a primary reason women seek HRT.

HRT is the most effective treatment for these symptoms. Women who start HRT within 10 years of menopause onset have an estimated 27% reduced risk of cardiovascular disease.

The Benefits of HRT

A study by researchers from Virginia Commonwealth University and the University of Pittsburgh analyzed 20 years of health data from over 2,700 women in the SWAN project. More than 750 participants started taking HRT for vasomotor symptoms during this period. The team reported that women who took HRT had a 22% lower risk of cardiovascular events such as congestive heart failure, heart attack, and stroke compared to those who did not take HRT.

The Risks of HRT

HRT is not without risks. Clinical trials in the early 2000s raised concerns about increased risks of heart disease, stroke, and breast cancer. The SWAN study found that women who took HRT over a long period of time had a greater risk of breast cancer. These findings show the importance of balancing HRT’s benefits against its potential risks, especially for long-term use.

Race and ethnicity also impact HRT’s effects. Black women who started HRT in peri- or early post-menopause had a 49% reduction in their risk for cardiovascular events. This is notable because Black women are more likely to experience severe vasomotor symptoms, showing the need for further research on HRT’s effects across different races and ethnicities. The study’s observational nature means causation cannot be definitively established, but the findings are significant.

Timing is Key

Current guidelines advise women under 60 to start HRT within 10 years of menopause onset and take it for the shortest period of time possible. The study highlights that the timing of HRT is key, as it can significantly influence cardiovascular outcomes. Starting HRT earlier, when vascular disease is less prevalent, may offer greater benefits. Researchers suggest that declining vascular health with age may explain these findings, though further study is needed.