Epidemiology, diagnosis, and management of polycystic ovary syndrome
Susan M Sirmans, Kristen A Pate
Department of Clinical and Administrative Sciences, College of Pharmacy, University of Louisiana at Monroe, Monroe, LA, USA
Abstract: Polycystic ovary syndrome (PCOS) is a common heterogeneous endocrine disorder characterized by irregular menses, hyperandrogenism, and polycystic ovaries. The prevalence of PCOS varies depending on which criteria are used to make the diagnosis, but is as high as 15%–20% when the European Society for Human Reproduction and Embryology/American Society for Reproductive Medicine criteria are used. Clinical manifestations include oligomenorrhea or amenorrhea, hirsutism, and frequently infertility. Risk factors for PCOS in adults includes type 1 diabetes, type 2 diabetes, and gestational diabetes. Insulin resistance affects 50%–70% of women with PCOS leading to a number of comorbidities including metabolic syndrome, hypertension, dyslipidemia, glucose intolerance, and diabetes. Studies show that women with PCOS are more likely to have increased coronary artery calcium scores and increased carotid intima-media thickness. Mental health disorders including depression, anxiety, bipolar disorder and binge eating disorder also occur more frequently in women with PCOS. Weight loss improves menstrual irregularities, symptoms of androgen excess, and infertility. Management of clinical manifestations of PCOS includes oral contraceptives for menstrual irregularities and hirsutism. Spironolactone and finasteride are used to treat symptoms of androgen excess. Treatment options for infertility include clomiphene, laparoscopic ovarian drilling, gonadotropins, and assisted reproductive technology. Recent data suggest that letrozole and metformin may play an important role in ovulation induction. Proper diagnosis and management of PCOS is essential to address patient concerns but also to prevent future metabolic, endocrine, psychiatric, and cardiovascular complications.
Keywords: polycystic ovary syndrome, diagnosis, comorbidities, epidemiology, management, comorbidities, women's health, hyperandrogenism
Polycystic ovary syndrome (PCOS) was first reported in modern medical literature by Stein and Leventhal who, in 1935, described seven women suffering from amenorrhea, hirsutism, and enlarged ovaries with multiple cysts.1 It is now recognized as a common, heterogeneous, heritable disorder affecting women throughout their lifetime. PCOS is characterized by hyperandrogenism, ovulatory dysfunction, and polycystic ovaries. However, there is considerable interindividual variation in presentation. Although not required for diagnosis, the presence of insulin resistance and hyperinsulinemia is common and places those affected at increased risk of diabetes and cardiovascular disease. Thus, PCOS adversely affects endocrine, metabolic, and cardiovascular health.
Clinical features and diagnostic criteria
The clinical presentation of PCOS varies widely. Women with PCOS often seek care for menstrual disturbances, clinical manifestations of hyperandrogenism, and infertility. Menstrual disturbances commonly observed in PCOS include oligomenorrhea, amenorrhea, and prolonged erratic menstrual bleeding.2 However, 30% of women with PCOS will have normal menses.3 Approximately 85%–90% of women with oligomenorrhea have PCOS while 30%–40% of women with amenorrhea will have PCOS.4
More than 80% of women presenting with symptoms of androgen excess have PCOS.5 Hirsutism is a common clinical presentation of hyperandrogenism occurring in up to 70% of women with PCOS.6 Hirsutism is evaluated using a modified Ferriman–Gallwey scoring system.7 This tool is used to evaluate hair growth at seven sites: upper lip, chin/face, chest, back, abdomen, arms, and thighs. A score of 0 is given in the absence of terminal hair growth and a score of 4 is given for extensive growth. A total score of 8 or more is indicative of hirsutism.8 Over 90% of normally menstruating women with hirsutism are identified through ultrasound to have polycystic ovaries.9 In addition, PCOS occurs in 50% of women with less severe distribution of unwanted hair growth.10 Acne can also be a marker of hyperandrogenism but is less prevalent in PCOS and less specific than hirsutism. Approximately 15%–30% of adult women with PCOS present with acne.5,11 The difference in prevalence of hirsutism and acne may be attributed to the difference in expression of 5α-reductase in the sebaceous gland and the hair follicle, and resulting higher dihydrotestosterone in the hair follicle.12 Of those women presenting with severe acne, over 40% were diagnosed with PCOS.13 Some experts recommend that women presenting with acne be asked about their menstrual history and be evaluated for other signs of hyperandrogenism.12
Infertility affects 40% of women with PCOS.14 PCOS is the most common cause of anovulatory infertility. Approximately 90%–95% of anovulatory women presenting to infertility clinics have PCOS. Women with PCOS have a normal number of primordial follicles and primary and secondary follicles are significantly increased. However, due to derangements in factors involved in normal follicular development, follicular growth becomes arrested as follicles reach a diameter of 4–8 mm. Because a dominant follicle does not develop, ovulation does not ensue.14,15 In addition, spontaneous abortion occurs more frequently in PCOS with incidences ranging from 42%–73%.16,17
Diagnostic criteria for PCOS have been offered by three groups: the National Institutes of Health/National Institute of Child Health and Human Disease (NIH/NICHD);18 the European Society for Human Reproduction and Embryology/American Society for Reproductive Medicine (ESHRE/ASRM);19 and the Androgen Excess and PCOS Society.20 These criteria are summarized in Table 1.
While there are certain consistencies between the criteria offered by the different groups, important differences exist. Each issuing group considers PCOS a diagnosis of exclusion, and other diagnoses, such as congenital adrenal hyperplasia, nonclassic adrenal hyperplasia, Cushing syndrome, androgen-secreting tumor, idiopathic hyperandrogenism, idiopathic hirsutism, hyperprolactinemia, and thyroid disorders must be excluded. Because 20%–30% of otherwise normal women have evidence of multiple cysts on their ovaries,20 the presence of polycystic ovaries (PCO) alone was not considered sufficient by any group. The NIH/NICHD and the Androgen Excess Society require that patients have signs or symptoms of hyperandrogenism such as hirsutism, or hyperandrogenemia, defined as elevated free testosterone, reduced SHBG (sex hormone-binding globulin), elevated free testosterone index, or elevated dehydroepiandrosterone sulfate.18,20 However, ESHRE/ASRM (Rotterdam) criteria allows for the diagnosis of PCOS without the presence of hyperandrogenemia or clinical hyperandrogenism. Women with ovulatory dysfunction and the presence of polycystic ovaries are considered to have PCOS by the Rotterdam criteria. Another key difference between the criteria is how oligomenorrhea or amenorrhea are viewed. The Rotterdam criteria did not require irregular menses or ovulatory dysfunction for diagnosis citing that women with regular menstrual cycles could be considered to have PCOS in the presence of PCO and hyperandrogenemia or hyperandrogenism.19 Subclinical ovulatory dysfunction can occur in women with regular menstrual bleeding.20 However, NIH/NICHD excludes the diagnosis of PCOS in women with regular menses and subclinical ovulatory dysfunction.
The diagnosis of PCOS using the Rotterdam and AES criteria depends on the use of a reliable method to describe polycystic ovarian morphology. The criteria for polycystic ovarian morphology proposed by the Rotterdam consensus group includes the presence of 12 or more follicles measuring between 2 and 9 mm in diameter and/or an increased ovarian volume of greater than 10 cm3. This presentation in one ovary sufficiently defines the polycystic ovary.19 However, since that time, significant advancements in ultrasound image technology have been made, improving resolution and allowing for the detection of smaller follicles.21 This has prompted calls for revisiting the criteria used to define polycystic ovarian morphology.21–23 Allemand et al used three-dimensional transvaginal ultrasound to measure the mean follicle number per ovary (FNPO) and the maximum number of follicles in a single sonographic plane in ten patients with diagnosed PCOS and 29 normoandrogenic ovulatory controls.23 A mean FNPO of ≥20.1 identified PCO with 100% specificity and 70% sensitivity. A maximum number of follicles in a single sonographic plane of ten identified PCO with 100% specificity and 90% sensitivity. Ovarian volume, measured by two-dimensional transvaginal ultrasound, of ≥13.0 cm3 predicted PCO with a specificity of 100% and a sensitivity of 50%. Using two-dimensional transvaginal ultrasound, Dewailly et al measured the total number of all follicles that were less than 10 mm in diameter throughout the ovary and also measured the ovarian volume.22 A threshold follicle number of 19 had a sensitivity for predicting PCO of 81% and a specificity of 92%. Ovarian volume of 7 cm3 predicted PCO with a sensitivity of 87% and a specificity of 89%. Lujan et al measured FNPO, follicle counts in a single cross section, and ovarian volume in images that were digitally archived for offline analysis.21 In their analysis, a FNPO threshold of 26 follicles had a sensitivity of 85% and specificity of 94% in discriminating between subjects with PCOS and controls. A threshold of nine follicles for follicle counts in a single cross section had a sensitivity of 69% and specificity of 90%. The threshold for ovarian volume of 10 cm3 yielded a sensitivity of 81% and a specificity of 84%.
Epidemiology and risk factors
Prevalence estimates for PCOS, as defined by the NIH/NICHD criteria, indicate that PCOS is a common endocrinopathy affecting 4%–8% of women of reproductive age.24–28 Recently, several groups have demonstrated that the prevalence of PCOS varies depending on the diagnostic criteria used (see Table 2).29–32 These studies consistently report that the prevalence estimates using the Rotterdam criteria are two to three times greater than those obtained using the NIH/NICHD criteria.
Family history of PCOS is a risk factor for PCOS. Based on the clustering of cases in families, PCOS is considered to be a heritable disorder.33,34 A high prevalence of PCOS or its features among first-degree relatives is suggestive of genetic influences.35,36 In addition, greater concordance has been reported in monozygotic twins versus dizygotic twins.37 However, the mode of inheritance remains elusive. Issues that hamper progress in this area include the heterogeneity of PCOS phenotypes, difficulty in assigning a phenotype to men, postmenopausal women, and prepubertal girls, and difficulties in obtaining large enough sample sizes to allow for adequate statistical power.38 A genome wide association study conducted amongst Han Chinese has identified loci on chromosomes 2p16.3, 2p21, and 9q33.3.39 Some of these results were replicated in European cohorts, namely the chromosome 2p21 THADA and chromosome 9p33.3 DENND1A susceptibility loci. The sharing of the same susceptibility genes suggests that PCOS is an ancient disorder originating before humans migrated out of Africa.40
An increased prevalence of PCOS is associated with a number of conditions. A history of weight gain often precedes the development of the clinical features of PCOS,41 and following a healthy lifestyle has been shown to reduce body weight, abdominal fat, reduce testosterone, improve insulin resistance, and decrease hirsutism in women with PCOS.42 Obese women referred for assistance with weight loss had a prevalence of PCOS of 28.3%.43 However, in an unselected population, prevalence of PCOS did not vary significantly based on obesity class.44 PCOS prevalence rates for underweight, normal-weight, overweight, mildly obese, moderately obese, and severely obese women were 8.2%, 9.8%, 9.9%, 5.2%, 12.4%, and 11.5%, respectively. The authors concluded that obesity may increase the risk of PCOS but that the effect was modest.
An increased frequency of reproductive disorders, including PCOS, has been reported in women with epilepsy.45 Using NIH criteria for diagnosis, Bilo et al46 identified PCOS in 13 of 50 women (26%) with epilepsy. Among the 16 patients who were not treated for epilepsy at presentation, five (31%) were diagnosed with PCOS, supporting the contention that epilepsy, independent of antiepileptic drugs, increases the risk of PCOS. Valproic acid, an antiepileptic drug widely used to treat epilepsy, bipolar disorder, and migraine, is associated with features of polycystic ovary syndrome when used to treat women with epilepsy. These features include menstrual disturbances, polycystic ovarian morphology, and elevated serum testosterone.47,48 Substitution of lamotrigine for valproic acid in women with epilepsy resulted in reductions in body mass index, fasting serum insulin, and testosterone concentrations.49 Thus, the confounding effects of medication must be considered when evaluating the literature that probes the relationship between epilepsy, bipolar disorder, and PCOS.
Type 1, Type 2, and gestational diabetes have been associated with an increased prevalence of PCOS. Escobar-Morreale et al screened 85 Caucasian women with type 1 diabetes mellitus for PCOS using the NIH/NICHD criteria.50 PCOS was diagnosed in 16 of these women (18.8%). Subsequently, Codner et al screened 42 women with type 1 diabetes mellitus and 38 age and body mass index (BMI) matched controls for PCOS using the ESHRE/ASRM criteria.51 The prevalence of PCOS was 40.5% in the type 1 diabetes group and 2.6% in the control group, yielding a relative risk of PCOS of 15.4 (95% confidence interval [CI] 2.2–110.2; P<0.0001) in the type 1 diabetes group. In type 2 diabetes, PCO are extremely common, occurring in 82% of women.52 The prevalence of PCOS in type 2 diabetes using the NIH/NICHD criteria has been estimated to be 26.7%.53 A diagnosis of PCOS was verified in 15 of 94 women (16%) with gestational diabetes and in six of 94 (6.4%) of those without gestational diabetes (P=0.03).54
A number of factors that are associated with an increased risk of PCOS have been identified in children.55 Prenatal factors include high birth weight in girls born to overweight mothers, congenital virilization, and low birth weight. Risk factors apparent later in childhood include premature pubarche, atypical central precocious puberty, obesity syndromes, acanthosis nigricans, and metabolic syndrome. A high index of suspicion for the diagnosis of PCOS is warranted in adolescents with persistently irregular menses and these risk factors.56
Association of PCOS with other comorbidities
Although the demonstration of insulin resistance is not required to make the diagnosis of PCOS, it is clear that hyperinsulinemic insulin resistance plays a prominent role in PCOS. The prevalence of insulin resistance in PCOS ranges from 50%–70%57–60 and occurs independently of obesity.61 The effect of obesity on insulin resistance is additive to that of PCOS.61 Consistent with the increased prevalence of insulin resistance, metabolic syndrome is also more common in women with PCOS. A meta-analysis performed for studies with BMI-matched controls showed that PCOS is associated with a higher prevalence of metabolic syndrome compared to women without PCOS (odds ratio [OR] 2.20, 95% CI 1.36–3.56). Lean women with PCOS were also more likely to have metabolic syndrome than lean women without PCOS (OR 3.00, 95% CI 1.24–6.78).62 The components of metabolic syndrome are associated with insulin resistance and are summarized in Table 3.63
Table 3 Clinical identification of the metabolic syndrome
A specific abnormal pattern of insulin receptor phosphorylation, namely increased serine phosphorylation and reduced tyrosine phosphorylation, appears to be responsible for insulin resistance observed in PCOS.64 However, insulin’s effect on steroidogenesis in the ovarian theca cells is not adversely affected. Hyperinsulinemia produces a hyperandrogenic state by acting as a cogonadotropin with luteinizing hormone (LH), increasing androgen production by theca cells and by reducing hepatic production of sex hormone binding globulin, resulting in higher concentrations of free androgens.65
Independent of obesity, PCOS is associated with a higher prevalence of impaired glucose tolerance and type 2 diabetes. Although most women with PCOS maintain sufficient beta-cell function to prevent deterioration in glucose tolerance, a significant proportion, especially those with first degree relatives with type 2 diabetes, demonstrate abnormal beta-cell response in response to glucose challenge or meals.66–70 In women with PCOS and normal glucose tolerance at baseline, 16% converted to impaired glucose tolerance per year; women with impaired glucose converted to type 2 diabetes at a rate of 2% per year.71 Approximately 30%–40% of women with PCOS have impaired glucose tolerance and 7.5%–10% have type 2 diabetes.72,73 These rates are substantially higher than the 7.8% rate of impaired glucose tolerance and 2.5% rate of diabetes observed in women of similar age in the Second National Health and Nutrition Survey.74 In a recent meta-analysis, a subgroup analysis of BMI-matched studies reported the OR for impaired glucose tolerance was 2.54 (95% CI 1.54–4.47) for women with PCOS.62 When evaluating only lean subjects, the OR for impaired glucose tolerance was 3.22 (95% CI 1.26–8.24). The same meta-analysis evaluated the prevalence of type 2 diabetes in BMI-matched studies and reported a higher prevalence of type 2 diabetes in PCOS (OR 4.0, 95% CI 1.97–8.1).
An increased risk of dyslipidemia has been demonstrated in PCOS. Lipid abnormalities include reduced high density lipoprotein-cholesterol (HDL-C), increased triglycerides, and increased low density lipoprotein-cholesterol (LDL-C). A recent meta-analysis by Wild et al evaluated the difference in lipoproteins from women age 18–45 years with PCOS compared to controls from the same catchment area.75 Triglycerides were 26.39 mg/dL (95% CI 17.24–35.54) higher and HDL-C was 6.41 mg/dL (95% CI 3.68–9.14) lower in PCOS. LDL-C was 12.60 mg/dL (95% CI 9.51–15.69) higher in PCOS. The difference in LDL-C was greater when the NIH/NICHD criteria were used to identify PCOS (14.95 mg/dL [95% CI 13.08–16.82]) than when the ESHRE/ASRM criteria were used (8.35 mg/dL [95% CI 5.16–11.54]). In addition, studies have revealed the presence of highly atherogenic small dense low density lipoprotein (LDL) in women with PCOS.76–78 Obesity and insulin resistance promote a high hepatic triglyceride content, which, in turn, leads to increased hepatic secretion of very low density lipoprotein (VLDL) particles. Insulin resistance is also associated with reduced clearance of VLDL particles and chylomicrons by reducing the activity of lipoprotein lipase, increasing levels of apolipoprotein C-III, and impairing apolipoprotein E-mediated clearance of triglyceride rich lipoproteins. In addition, hepatic triglyceride content determines the size of the VLDL particles produced by the liver. When the hepatic content of triglycerides is high, larger VLDL particles are produced. Metabolism of these large particles results in the formation of small, dense LDL particles that are poorly cleared and more atherogenic.79
Several studies conclude that women with PCOS have an increased prevalence of hypertension. Potential mechanisms of hypertension in PCOS include endothelial dysfunction, as evidenced by increased endothelin-1 levels80 and increased aldosterone concentrations related to insulin resistance.81 However, many of these studies did not control for obesity; a common comorbidity in PCOS and a well-known risk factor for hypertension.82 Lo et al reported that women with PCOS were more likely to have hypertension or elevated blood pressure than controls after adjusting for BMI category, age, diabetes, and dyslipidemia (adjusted OR 1.53, 95% CI 1.31–1.51).83 Czech women with PCOS were also more likely to have hypertension compared to controls.84 Hypertension was present in 22% of the women with PCOS compared to 2.1% of controls. Mean systolic and mean diastolic blood pressures remained significantly higher in the PCOS group after adjusting for BMI. In a study of Dutch women aged 45–54 years, the prevalence of hypertension was 28.1% in the PCOS group and 11.1% in the control group.85 In this age group, the proportion of obese PCOS women did not differ from the control group.
Despite the apparent clustering of cardiovascular risk factors in PCOS, evidence that PCOS is associated with increased cardiovascular events is scarce. A retrospective cohort study by Wild et al was unable to demonstrate a significant increase in coronary heart disease morbidity and mortality in women with PCOS.86 However, cerebrovascular disease was more prevalent in women with PCOS after adjustment for BMI (OR 3.4, 95% CI 1.2–9.6). Results from a prospective 21-year follow-up study of 35 women with PCOS who had undergone ovarian wedge resection up to 31 years previously did not demonstrate an increase in cardiovascular events compared to 120 age-matched controls.87 In contrast, Shaw et al reported a 3.3-fold greater risk for cardiovascular death or myocardial infarction in 104 postmenopausal women with a history of irregular menses and hyperandrogenemia.88 Event free survival was significantly reduced after adjusting for age, obesity, diabetes and angiographically-demonstrated cardiovascular disease. This is consistent with a study that evaluated the relationship between menstrual cycle irregularity and risk for cardiovascular disease.89 Participants included 82,439 women enrolled in the Nurses’ Health Study90 who responded to a question regarding menstrual cycle regularity at ages 20–35 years. Women responding that their menstrual cycles were usually irregular comprised 10.9% of the participants while 4.3% of the participants indicated that their menstrual cycles were very irregular. The age-adjusted relative risk (RR) for total coronary heart disease events was 1.25 (95% CI 1.07–1.47) for those women reporting usually irregular menstrual cycles and 1.67% (95% CI 1.35–2.06) for those with very irregular menstrual cycles. Stroke was not significantly elevated in women with irregular menses.
Noninvasive assessments, including coronary artery calcium (CAC) scores and carotid intima-media thickness (CIMT), have demonstrated a greater prevalence of subclinical atherosclerosis in PCOS. CAC scores are predictive of myocardial infarction and sudden cardiac death.91 The increase in CAC scores observed in PCOS is independent of age and BMI.92–95 CIMT is positively associated with stroke and myocardial infarction and is a reliable measure of atherosclerosis.96 Young women with PCOS have a greater CIMT compared to age- and BMI-matched controls.81,97–100 Some experts recommend that CIMT be measured in women with PCOS at age 30 and every 3–5 years after, and that CAC be measured by computed tomography by age 45.101
Women with PCOS are also at increased risk of a number of mental health disorders including depression, bipolar disorder, anxiety, and eating disorders. During systematic screening, Hollinrake et al demonstrated that 35% of women with PCOS suffered from depression compared to 10.7% in controls (P<0.0001).102 After controlling for BMI, family history of depression, and history of infertility, the adjusted OR for overall depressive disorders in women with PCOS was 4.23 (95% CI 1.49–11.98). These results were consistent with those of a recent meta-analysis that reported an OR for abnormal depression scores in women with PCOS of 4.03 (95% CI 2.96–5.50).103 Klipstein and Goldberg screened 78 attendees of the Polycystic Ovarian Syndrome Association regional meetings for bipolar disorders.104 Subjects were considered to have bipolar disorder if they had a previous diagnosis by a mental health professional or a positive screen on the Mood Disorders Questionnaire. Approximately 27% of participants were classified as having bipolar disorder. Use of valproate prior to the diagnosis of PCOS was reported in two of the subjects. Using the Mini International Neuropsychiatric Interview, Rassi et al reported that 11.1% of women with PCOS receiving care in an outpatient endocrine clinic met the criteria for bipolar disorder types I or II.105 Prevalence estimates of bipolar disorder in the general population range from 0.5%–2%.106 Results from screenings in women with PCOS for anxiety disorders have also been reported. Prevalence estimates of abnormal anxiety scores in PCOS vary widely and range from 13%–63%.107 A recent meta-analysis indicated that anxiety is more common in women with PCOS compared to controls (OR 6.88, 95% CI 2.5–18.94).107 Binge eating disorder also appears to be more common in PCOS with 12.6% of women with PCOS affected compared to 1.9% of controls.102
Outline of management strategies for PCOS
The choice of treatment for women with PCOS depends on the symptoms with which a patient presents. Symptoms typically fit into three categories: menstruation related disorders; androgen-related symptoms; and infertility.108 Management strategies for these characteristic symptoms of PCOS are described below.
Treatment of androgen-related symptoms
The most common androgen-related symptoms associated with PCOS are acne, hirsutism, and alopecia. The symptoms vary for each patient; some patients present with only one or two symptoms, while a few patients complain of all three. Typically, oral contraceptive pills (OCPs) are first-line for pharmacologic management of hirsutism in premenopausal women.108 Women often use laser hair removal and other mechanical hair removal options because pharmacologic treatments do not produce the results they desire.109 It generally takes at least 6 months of treatment to see a response due to the growth cycle of hair.6 Antiandrogens can be added if there has been no improvement after 6 months of treatment. OCPs and antiandrogens have both been effective in the treatment of acne.108 In severe acne, isotretinoin may offer benefits for some patients.6 There is limited data for treatment of alopecia, but OCPs and androgen blockers are used.108
Combined hormonal contraceptive (CHC) OCPs are a good treatment option for those patients that do not wish to become pregnant, and they are often considered first line for the treatment of PCOS-related hirsutism and acne. CHCs promote negative feedback on the production of LH, causing a decreased synthesis of androgens by the ovaries. Other mechanisms by which CHCs reduce androgens include: 1) decreasing circulating levels of free androgen by increasing the production of sex hormone-binding globulin in the liver; 2) decreasing adrenal androgen secretion; and 3) inhibiting peripheral conversion of testosterone to dihydrotestosterone and binding of dihydrotestosterone to androgen receptors. Progestins have varying degrees of androgenic effects. Newer OCPs typically contain less androgenic progestins such as norethindrone, desogestrel, and norgestimate.108 Drospirenone is a newer progestin that functions as an androgen receptor antagonist, and it is a spironolactone analog with antimineralocorticoid activity. Caution should be used in patients at an increased risk of hyperkalemia, and potassium should be monitored in patients also taking spironolactone.108,109 Dienogest is another newer progestin that has antiandrogenic properties.108 There is no definitive evidence that there are differences in efficacy among low dose CHCs. Although there are risks associated with CHCs, the benefits seem to outweigh the risks in the majority of patients with PCOS.6
Spironolactone, an aldosterone antagonist, is an antiandrogen that primarily acts by binding to the androgen receptor as an antagonist. It also inhibits ovarian and adrenal steroidogenesis, directly inhibits 5-α-reductase activity, and competes for androgen receptors in hair follicles.108,109 Doses of 25–200 mg per day in one to two divided doses are used.110 Due to the fact that, when used alone, it can cause menstrual irregularity and has the risk of feminizing a male fetus if the patient becomes pregnant, spironolactone is commonly used in combination with OCPs for treatment of PCOS related symptoms.108,109 Spironolactone can cause hyperkalemia, and, thus, should be used with caution in patients with renal impairment.109 Finasteride is an antiandrogen that competitively inhibits tissue and hepatic 5-α-reductase resulting in inhibition of the conversion of testosterone to dihydrotestosterone and suppression of serum dihydrotestosterone levels.109,110 Finasteride is pregnancy category X due to the risk of feminizing a male fetus if pregnancy occurs. Patients on finasteride should use adequate contraception, with OCPs as an option that could potentially offer synergistic effects.108,109
Metformin and thiazolidinediones have insulin-lowering effects by improving insulin sensitivity, and in turn can decrease circulating androgen levels.108 Additionally, these agents have a role in the treatment of PCOS due to the fact that women with PCOS are at an increased risk of insulin resistance, and in turn the development of metabolic disorders and cardiovascular disease.109 Although no antidiabetic agents have US Food and Drug Administration approval for the treatment of PCOS, metformin is preferred at this time due to the fact that it appears to have the safest risk-benefit ratio, and it can cause weight loss, while thiazolidinediones can increase weight as a result of fluid retention.109
Eflornithine is a topical cream that has been approved by the US Food and Drug Administration for removal of unwanted facial hair in females.108,109 Eflornithine inhibits the enzyme ornithine decarboxylase in the skin, which inhibits cell division and synthetic functions, thus reducing the rate of hair growth. It should be used twice daily, at least 8 hours apart, on the affected areas of the face and chin.108,110
Treatment of menstruation- related disorders
Along with patient complaints of menstrual irregularity, the often chronic anovulation that is associated with PCOS can increase a patient’s risk of endometrial hyperplasia and carcinoma. Using either cyclic progestin or a low dose CHC containing estrogen and progestin can help inhibit endometrial proliferation.108 Low dose CHCs are the primary recommended treatment option for PCOS-related menstrual disorders and improved menstrual regularity.109
Weight loss can improve circulating androgen levels, along with providing numerous other metabolic benefits for patients with PCOS.108 The benefits of weight loss can be evident with a loss of 5% of initial body weight.109 An additional treatment that is gaining popularity is acupuncture. The primary benefits that have been suggested with acupuncture are reduced hyperandrogenism and improved menstrual regularity.108,111
Treatment of infertility
Weight loss is recommended as first-line therapy for the management of infertility in overweight and obese women with PCOS. Anovulation112 and pregnancy loss113 are linked with obesity. In addition, obesity is associated with a reduced response to fertility treatments including clomiphene citrate,114,115 gonadotropins,116,117 and laparoscopic ovarian diathermy.118 Observational studies indicate that weight loss of 5%–10% can increase ovulation and pregnancies.119 Bariatric surgery has been shown to improve cycle regularity, increase ovulation, and increase spontaneous conception.120–122
Clomiphene citrate is the drug of first choice for ovulation induction in women with PCOS.123 Clomiphene citrate is a partially selective estrogen receptor modulator. Its antiestrogenic activity at the hypothalamus induces a change in gonadotropin releasing hormone (GnRH) pulse frequency leading to increased release of follicle stimulating hormone (FSH) from the pituitary gland. The ovulation rate with clomiphene ranges from 70%–85% per cycle, while the cumulative live birth rate ranges from 50%–60% for treatment up to six cycles.124 The starting dose of clomiphene citrate is 50 mg per day for 5 days starting on days 2–5 following a spontaneous or progestin-induced withdrawal bleeding. If ovulation does not ensue, the dose is increased by 50 mg per cycle to a maximum dose of 150 mg/day. The maximum number of cycles is generally limited to six ovulatory cycles.123 If ovulation cannot be induced at doses of 150 mg/day, the patient is considered to be clomiphene resistant. Failure to achieve pregnancy after six ovulatory cycles is classified as a clomiphene failure.125
Metformin is a biguanide commonly used as an antihyperglycemic agent. It has been extensively evaluated in PCOS associated infertility. In its 2008 consensus statement, the ESHRE/ASRM concluded that metformin is less effective than clomiphene in inducing ovulation and that there was no advantage to adding metformin to clomiphene.123 In a meta-analysis of randomized controlled trials, metformin improved ovulation rate and clinical pregnancy rate but not live birth rate when compared to placebo or no treatment.126 However, in a recent multicenter, randomized, double-blind, placebo-controlled study, metformin increased live-birth rates compared to placebo (41.9% versus 28.8%, P=0.014) with the most beneficial effect seen in obese women.127 These results are consistent with another study that evaluated pretreatment with metformin for 3 months before in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI).128 Although the role of metformin for ovulation induction in PCOS has been limited, these results suggest that metformin may play an important role in improving live birth rates when administered 3 months prior to and concurrent with standard infertility treatments.
Aromatase inhibitors block the conversion testosterone and androstenedione to estradiol and estrone, respectively. This decrease in estrogenic activity releases the hypothalamus from negative feedback, allowing for an increase in the release of FSH.129 Letrozole, the most commonly used aromatase inhibitor for ovulation induction, is administered in doses between 2.5–7.5 mg per day for 5 days starting on day 3 of the menstrual cycle.130 Putative advantages of letrozole include its lack of antiestrogenic effects on the endometrium,131 shorter half-life when compared to clomiphene and a higher rate of monofollicular ovulation.129 A recent systematic review and meta-analysis of randomized controlled trials that compared letrozole with clomiphene indicated that letrozole administration was associated with a higher ovulation rate per person. However, letrozole did not increase ovulation per cycle, pregnancy, or live birth rate per person.132 Since that review, a study comparing clomiphene citrate with letrozole in 103 treatment-naïve infertile women with PCOS demonstrated that letrozole use was associated with a similar ovulation rate (73.08% in the letrozole group versus 60.78% in the clomiphene group, P=0.39) but significantly higher pregnancy rate (21.56% in the letrozole group versus 7.84% in the clomiphene group, P=0.015).133 The Pregnancy in Polycystic Ovary Syndrome II study targeted 750 infertile women with PCOS to compare the rate of live birth for clomiphene versus letrozole.134 The results of this trial will clarify the role of letrozole for ovulation induction in women with PCOS.
Ovulation induction with gonadotropins and laparoscopic ovarian drilling (LOD) are considered to be second line therapies for ovulation induction by the ESHRE/ASRM.123 The gonadotropin approach is less invasive and is the preferred treatment in women who do not desire surgery. LOD is preferred when the patient has other indications for surgery or when the patient is not able to comply with the frequent follow-up visits required with gonadotropin therapy.135
The goal of FSH administration for ovulation induction is the development of a single follicle resulting in a singleton live birth. Risks associated with ovulation induction include ovarian hyperstimulation syndrome (OHSS) and pregnancy with multiples. Because women with PCOS are very sensitive to the effects of FSH, a low-dose step-up protocol is recommended.123,136 The starting dose of FSH of 37.5–50 IU daily is increased in increments of 25–37.5 IU at 7–14 day intervals until follicular development is observed. Serial ultrasound and serum estradiol concentrations are used to guide FSH dose titration and to determine when human chorionic gonadotropin should be administered to trigger ovulation.137 Cycle cancellation is advised if more than two follicles are greater than 16 mm or one follicle is greater than 16 mm and two other follicles are greater than 14 mm.123 A recent study compared the efficacy of clomiphene versus low-dose step-up FSH protocol for up to three cycles as first line therapy for the treatment of infertility in anovulatory women with PCOS. Per protocol analysis indicated that the low-dose step-up FSH protocol produced a higher pregnancy rate in the first cycle (30% versus 14.6%, P=0.003), a higher cumulative pregnancy rate (52.1% versus 41.2%, P=0.021), and a higher cumulative live birth rate (47.4% versus 36.9%, P=0.031).138 However, clomiphene treatment is more convenient and less costly than gonadotropin therapy.
LOD involves the use of laser or electrocautery to drill four to ten holes in the surface and the stroma of the ovary. It is indicated for the treatment of infertility in clomiphene-resistant PCOS.123 A single treatment results in the establishment of ovulatory menstrual cycles in 92% of women, and pregnancy in 58%.139 Predictors of a poor response to LOD include a body mass index of ≥35 kg/m2, serum testosterone concentrations of ≥4.5 nmol/L, free androgen index ≥15, and a duration of infertility of >3 years. Serum LH concentrations ≥10 IU/L at baseline are associated with a significantly greater likelihood of pregnancy.140 When LOD was compared to clomiphene as first line therapy, no difference was observed in ovulation or pregnancy between the two treatments.141 A Cochrane review indicated that LOD rivals the pregnancy rate and live birth rate of three to six cycles of gonadotropins without putting the patient at risk for OHSS or multiple births.142 A recent systematic review and meta-analysis compared LOD with or without medical ovulation induction therapy to pharmacologic ovulation induction in clomiphene resistant PCOS and found no difference in ovulation rate or live birth rate between the groups. However, no cases of OHSS were observed in the LOD group and multiple pregnancy occurred less frequently with LOD (OR 0.21, 95% CI 0.08–0.58, P=0.002).143
In-vitro fertilization (IVF) is recommended as third-line therapy for the management of infertility by the 2008 Thessaloniki ESHRE/ASRM-Sponsored PCOS Consensus Workshop Group.123 Women with PCOS have similar pregnancy, miscarriage, and live-birth rates with conventional IVF compared to non-PCOS patients.144 Women with PCOS experienced more cycle cancellations. In addition more oocytes were retrieved per cycle with a lower fertilization rate in women with PCOS. In a recent Cochrane review comparing the GnRH antagonist protocol with the long GnRH agonist protocol in women with PCOS undergoing IVF/ICSI treatment, no significant difference was found in ongoing pregnancy rate or clinical pregnancy rate. However, the rate of OHSS was 10% lower with the antagonist protocol.145 In a randomized, double-blind, placebo-controlled trial, metformin 500 mg three times per day significantly reduced the risk of OHSS (RR 0.28, 95% CI 0.11–0.67) in women with PCOS undergoing IVF/ICSI who were at high risk for OHSS.146
Proper diagnosis and management of PCOS is essential as PCOS has many potential metabolic and cardiovascular risks if not managed appropriately.109 It is clear that the underlying pathophysiology of PCOS is not fully understood.108 As a result, treatment is often focused on individual symptoms, not the syndrome itself. However, as the understanding of the pathophysiology of PCOS improves, so does the treatment. Although treatment should be individualized, it should also focus on all metabolic consequences and decreasing future complications.147 More extensive research and understanding of the pathophysiology of PCOS will improve treatment success and overall management of patients.108
The authors report no conflicts of interest in this work.
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