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Elevated FSH after hysterectomy
Title:FSH levels in relatio to hysterectomy and to unilateral
oophorectomy
Author: G. Cooper, et al.
Address: Chapel Hill, NC
Source: Obstetrics & Gynecology 94: 969-972 (December) 1999
Summary: The objective of this study was to examine the association
between hysterectomy, unilateral oophorectomy, and ovarian status, measured by
FSH concentrations, in women aged 35-49. There were 1716 women aged 35-49
included in this study. Researchers used logistic regression to analyze FSH
concentration in relation to hysterectomy and oophorectomy, controlling for age,
ethnicity, body mass index, smoking, education, nulligravidity, and exercise.
Hysterectomy with unilateral oophorectomy was associated with an increased
prevalence of elevated FSH (>20 IU/L) compared with women who had not had
hysterectomies or oophorectomies. Among women with 2 ovaries, hysterectomy was
associated with increased prevalence of elevated FSH. As a comparison of the
effect size, the observed association between hysterectomy and elevated FSH was
smaller than the relationship between FSH and current smoking, a factor
associated with a 1-2 year decrease in mean age at natural menopause. Although
variances in FSH levels were minor, there was indication of raised FSH in women
who have had hysterectomies, even if at least 1 ovary remained.
Comment: It is commonly taught that 30% of the blood supply of the ovary is from
the uterine arteries. It is commonly believed that alteration of blood supply is
associated with decreased functioning of the ovary and possible cyst formation
(residual ovary syndrome). This gives creditability to both of these, as will as
complaints of hot flashes after hysterectomy in which the ovaries are not
removed.