Women are less prone to cardiovascular disease then men; but this difference between the sexes becomes less marked after the menopause. This observation is behind a great deal of received wisdom, where oestrogen is assumed to have a beneficial effect on the heart and blood vessels. Today, new data seems to question these presuppositions. A study has been conducted by a team of Inserm researchers, directed by Pierre-Yves Scarabin (Inserm Unit 1018 “Centre for Epidemiology and Population Health Research”), on 6,000 women aged over 65; its results demonstrate, for the first time, that women with high levels of oestradiol in their blood are exposed to a greater risk of myocardial infarction or strokes.
The results are published in the Journal of the American Heart Association.
Oestrogen hormones play a key role in sexual development and reproduction in women. Oestradiol is the most active hormone. Its blood levels are particularly high during the active reproductive period. After the menopause, the ovarian function ceases, leading to a significant drop in oestrogen levels in the blood (the adipose tissue then becomes the main source of oestrogen). However, low concentrations of these hormones do continue to circulate and may still exert biological actions.
