Women who are more than 10 years post-menopause and who have had their ovaries removed lose bone mineral density at twice the rate of those who have kept their ovaries and they show greater progression in the thickening of the carotid artery. Oophorectomy appears to put women at higher risk for developing both osteoporosis and cardiovascular disease (CVD).
Osteoporosis and cardiovascular disease are common health problems in women as they age, particularly after menopause. The severity of both conditions is affected by decreasing levels of hormones. This ebbing of hormones occurs naturally as a woman goes through menopause, but it can occur abruptly if she has her ovaries surgically removed.
Researchers at the University of Southern California’s Keck School of Medicine investigated the effect of pre-menopausal oophorectomy on the rate of loss of bone mineral density (BMD) and the rate of thickening of the carotid artery, a measure of cardiovascular health, in healthy post-menopausal women. They hypothesized that women who retained their ovaries would have some protection against bone loss and vascular thickening compared to women who had had their ovaries removed.
They used data from 222 healthy postmenopausal women living in the greater Los Angeles area, enrolled in the WISH (Women’s Isoflavone Soy Health) trial, conducted from April 2004 to March 2009. The participants underwent scans for bone mineral density (BMD) at the start of the trial and annually thereafter and they had ultrasound assessments of carotid artery intima-media thickness (CIMT) every six months. Since the WISH trial found no treatment group differences in BMD or CIMT between women who had taken soy protein supplementation and women who received a placebo, data from both the treatment and control groups were used in this study. Data were evaluated from women who kept their ovaries and those who had oophorectomies, who were 5 to 10 years post-menopause and more than 10 years post-menopause. Data were excluded for estrogen and bisphosphonate use.
The researchers found that the rate of subclinical atherosclerosis progressed faster in those having undergone oophorectomy when compared to their ovary-retaining counterparts. CIMT progression and BMD loss were worse in those women greater than 10 years post-menopause who had undergone oophorectomy.