| Some patients with PCOS have regular menstrual cycles, but 85%-90%
have more than 35 days between cycles or have fewer than nine cycles
annually. Hyperandrogenemia (elevated free testosterone,
free androgen index, or DHEA levels) and/or clinical evidence of
androgen excess (hirsutism, acne, clitoromegaly, male body habitus) are
present in up to 80% of affected women.[6]
Polycystic ovaries are defined as having 12 or more small (2-9 mm)
follicles per ovary, although some authors suggest a much higher number
(> 25 per ovary).[6,7]
Diagnosis
becomes more challenging in teenagers and perimenopausal women. Among
adolescents, cycle irregularity and acne are already common, and
follicle counts tend to be high. Elevated serum androgen levels may be
the most consistent marker for PCOS in teens, but all three Rotterdam
criteria should be present to establish the diagnosis.[7]
In perimenopausal years, cycles tend to become more regular and
follicle counts lower in women with PCOS. Furthermore, age-related
declines in ovarian and adrenal androgen secretion make the diagnosis
challenging in menopausal women.[8]
Although not diagnostic, certain findings are more common in women with PCOS, including obesity (at least 50%), elevated luteinizing hormone levels, insulin resistance,
impaired glucose tolerance, type 2 diabetes, dyslipidemia,
hypertension, endothelial dysfunction, hypercoagulability, and
endometrial hyperplasia.
Some affected women have expressed
frustration with the process of evaluation and diagnosis that they
underwent to find out what was wrong with them — why they couldn't lose
weight or become pregnant, or why their menstrual periods were
irregular, not to mention the acne and distressing growth of body hair.
In recent crowdsourced data,
1 in 3 women reported that it took at least 2 years to be diagnosed
with PCOS, and almost half saw three or more healthcare professionals
along the way.[9]
Nor were women satisfied with the information they received about their
condition, giving particularly low marks to primary care providers,
whom they judged as unqualified to manage PCOS. A mere 15% were
satisfied with the information they received at the time of diagnosis.[9]
3. It's the most common cause of female infertility.
The
underlying cause of infertility among women with PCOS is
oligo-ovulation or anovulation. In fact, 90% of women with oligo- or
amenorrhea have PCOS.[7]
The lack of ovulation isn't the only strike against fertility, because
obesity, poorer oocyte quality, and an adverse endometrial environment
can also impair a woman's chance of conceiving. In addition to the
assessment of ovarian function, the couple should undergo a proper, full
infertility evaluation (male factor infertility, tubal status, etc.).
If the rest of the evaluation is normal, regular ovulation must be
restored to improve fertility.
Among
women with a higher body mass index, weight loss should be the
first-line treatment. The loss of as little as 5% of body weight can
have a favorable effect on ovarian function. For women who do not
conceive after lifestyle intervention, metformin (an insulin-sensitizing drug) has been shown to improve ovulation and live birth rates.[10]
Clomiphene
citrate is the recommended first choice for ovulation induction,
successfully inducing ovulation in up to 80% of women with PCOS. The
effect seems to be superior to metformin.[11,12]
Combining the drug with metformin (especially in women who are
resistant to clomiphene citrate) may further improve its efficacy.[10,12] As an alternative, aromatase inhibitors may induce ovulation without negative endometrial effects.
Women
who do not respond to oral agents can consider gonadotropin stimulation
or laparoscopic ovarian drilling. Gonadotropins are typically started
at a low dose with slow increases if needed in a step-up protocol.
Gonadotropins are highly effective in inducing folliculogenesis but
often lead to a multifollicular response, increasing the risk for ovarian hyperstimulation syndrome and multiple-gestation pregnancy. The use of in vitro fertilization
with elective embryo cryopreservation and subsequent single embryo
transfer may avoid these complications in women who are sensitive to
stimulation.[13] Adding metformin can lower the risk for hyperstimulation.[14]
The management of ovulatory infertility should begin with the least
invasive approach (lifestyle intervention), moving stepwise toward more
invasive (in vitro fertilization) treatments. Safety for the patient
(avoiding ovarian hyperstimulation) and the pregnancy (avoiding multiple
gestations) must be kept in mind, and in certain cases this may require
moving on to a more invasive strategy sooner or even right away.
4. PCOS isn't just a reproductive disorder.
The
health consequences of PCOS traverse not only a woman's childbearing
years but her entire lifespan. A meta-analysis based on 30 studies found
the risk for insulin resistance to be increased 2.48-fold, the risk for
diabetes 4.43-fold, and the risk for metabolic syndrome 2.88-fold.[15]
It is therefore recommended to screen women with PCOS (especially those
with high BMI) with an oral glucose tolerance test and lipid profile.
Cardiovascular disease (CVD) risk factors (elevated LDL cholesterol/triglycerides, low HDL cholesterol,
increased carotid intima thickness, increased coronary calcification,
increased left ventricular volume, diastolic dysfunction, endothelial
dysfunction) and obesity are significantly more common than in
age-matched women without PCOS.[5,16]
It
is controversial whether these CVD risk factors translate into
increased CVD morbidity or mortality, however. In a recent study, among
reproductive-aged women diagnosed with PCOS, the risk for myocardial infarction, stroke, or CVD-related death was not increased.[17]
The picture gets even more complicated as affected women enter menopause. The higher risks for glucose intolerance,
diabetes, dyslipidemia, and metabolic syndrome persist into menopause
in women with PCOS. The risk for hypertension, however, does not seem to
be higher, and data are inconsistent on the risk for myocardial
infarction, stroke, or CVD, with several studies finding no increased
risk for CVD among menopausal women with PCOS.[17,18,19]
The
Endocrine Society recommends lifestyle changes to avoid the metabolic
complications of PCOS that persist after a woman's reproductive years.
For women who do not achieve health goals with diet and exercise,
metformin is a key option.[16]
Insulin
resistance is undoubtedly involved in the pathomechanism of PCOS, but
for a long time it was unclear what came first. Did insulin resistance
cause the syndrome or did the endocrine abnormalities induce insulin
resistance? Currently it is believed that insulin resistance is
responsible for the endocrine and metabolic changes of PCOS.
5. A link with cancer is plausible.
An
association between PCOS and various cancers has long been studied.
PCOS is accompanied by long-periods of unopposed estrogen exposure,
which could induce endometrial hyperplasia and subsequent endometrial cancer.
Recent data suggest a threefold increased risk for endometrial cancer
among women with PCOS, as well as an increased risk for ovarian cancer.[20]
Insulin
might play a role in cancer risk as well, by increasing mitogenic
activity of certain insulin binding sites in the endometrial stroma.[21]
Furthermore, the hormonal regulation of endometrial cell death via
apoptosis, influenced by the normal menstrual cycle, is shifted toward
survival in women with PCOS, potentially providing cancer cells with a
survival advantage.[21]
These findings have led to studies to evaluate the role of
insulin-sensitizing medications in the prevention or treatment of
cancer. Preliminary findings suggest a protective role.[22]
|
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- Khadilkar SS. Polycystic ovarian syndrome: is it time to rename PCOS to HA-PODS? J Obstet Gynaecol India. 2016;66:81-87. Source
- Rosenwaks Z. Polycystic ovary syndrome, an enigmatic syndrome begging for a name change. Fertil Steril. 2017;108:748-749. Source
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- Legro RS, Barnhart HX, Schlaff WD, Carr BR,
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- Siebert TI, Viola MI, Steyn DW, Kruger TF. Is
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- Bosdou JK, Venetis CA, Tarlatzis BC, et al.
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