Objective—To prospectively estimate the risk for earlier ovarian failure among women undergoing hysterectomy with ovarian preservation, as compared to women of similar age without hysterectomy. Methods—A prospective cohort study was conducted among women aged 30 to 47 years undergoing hysterectomy without bilateral oophorectomy (n=406) and women with intact uteri (n=465). Blood samples and questionnaire data were obtained at baseline and annually for up to 5 years. Hazard ratios (HR) for ovarian failure, defined as follicle-stimulating hormone (FSH) levels 40 IU/L or higher, were calculated using Cox proportional hazards models. Results—Ovarian failure occurred among 60 of the women with hysterectomy and 46 of the control women. Women undergoing hysterectomy were at nearly a twofold increased risk for ovarian failure as compared to women with intact uteri (HR=1.92, 95% confidence interval (CI) 1.29 – 2.86). The proportional hazards model further estimated that 14.8% of women with hysterectomy experienced ovarian failure after four years of follow-up compared to 8.0% of the control women. Risk for ovarian failure was greater for women who had a unilateral oophorectomy along with their hysterectomy (HR=2.93, 95% CI 1.57 – 5.49), but also was significantly increased for women who retained both ovaries (HR=1.74, 95% CI 1.14 – 2.65). Conclusions—Increased risk of earlier ovarian failure is a possible consequence of premenopausal hysterectomy. While it is unresolved whether it is the surgery itself or the underlying condition leading to hysterectomy that is the cause of earlier ovarian failure, physicians and patients should take into account this possible sequela when considering options for treatment of benign conditions of the uterus.
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