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"polycystic ovary syndrome"[MeSH Terms] AND management

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Polycystic Ovary Syndrome (PCOS)

PCOS is the most common endocrine disorder of women in their reproductive years, affecting 6-12% of women of reproductive age worldwide, across all ethnic groups. It is a heterogeneous condition - meaning its presentation varies significantly between individuals.

What Is It?

PCOS is defined by the Rotterdam criteria - a diagnosis requires any 2 of these 3 features, after excluding other causes:

Oligo-ovulation or anovulation (irregular or absent ovulation)
Hyperandrogenism - clinical (hirsutism, acne, androgenic alopecia) or biochemical (elevated testosterone)
Polycystic ovaries on ultrasound (multiple small follicles arranged around the ovary)

Here is the diagnostic pathway:

Pathophysiology (How It Develops)

The hypothalamic-pituitary axis is structurally intact, but there is a functional derangement in how the ovaries communicate with it:

The ovaries produce excess androgens (especially testosterone), driven partly by abnormal LH pulsatility
Insulin resistance is a hallmark - present in the majority regardless of body weight. The resulting hyperinsulinemia stimulates the ovarian theca cells to produce even more androgens
This creates a self-reinforcing cycle: high androgens + high insulin → disrupted follicle development → failure to ovulate → chronic anovulation → unopposed estrogen
Genetic factors play a role - abnormalities in CYP17 and CYP19 (enzymes involved in androgen synthesis) have been identified
LH levels tend to be elevated; FSH is relatively low and constant - the LH:FSH ratio is often >3

Clinical Features

Patients typically present with one or more of the following:

Feature	Details
Menstrual irregularity	Oligomenorrhea (cycles > 35 days), amenorrhea, or sometimes heavy dysfunctional bleeding
Hirsutism	Excess androgen-driven hair growth on face, chest, abdomen
Acne & oily skin	Driven by androgens
Androgenic alopecia	Thinning at the crown
Obesity	Present in ~50-70%; exacerbates insulin resistance
Subfertility	Due to infrequent or absent ovulation

Onset typically begins at puberty and can worsen over time, though symptoms often improve in the years before menopause.

Associated Long-Term Risks

PCOS carries significant systemic health risks:

Type 2 diabetes: Over 50% of women with PCOS develop it by age 40
Endometrial hyperplasia and cancer: Due to chronic unopposed estrogen from anovulation
Cardiovascular disease: Driven by hyperandrogenism, insulin resistance, and dyslipidemia
Obstructive sleep apnea: Higher prevalence, especially with obesity
Mood disorders and eating disorders: Increased prevalence

Investigations / Lab Workup

Androgens: Total and free testosterone (mild elevation typical; very high levels suggest tumor)
LH/FSH ratio: Often > 3 (not required for diagnosis but supportive)
Fasting glucose / HbA1c / oral glucose tolerance test: To screen for diabetes
Lipid panel: Fasting cholesterol, triglycerides
TSH and prolactin: To exclude thyroid disease and hyperprolactinemia (important differentials)
17-hydroxyprogesterone: To exclude late-onset congenital adrenal hyperplasia
Pelvic ultrasound: Looking for polycystic ovarian morphology

Differential Diagnoses to Exclude

Before diagnosing PCOS, these must be ruled out:

Cushing syndrome
Congenital adrenal hyperplasia (CAH)
Androgen-secreting tumors (ovarian or adrenal) - suspect if onset is rapid
Hyperprolactinemia
Hypothyroidism or hyperthyroidism

Management

Treatment is individualized based on the patient's primary concerns and whether pregnancy is desired.

1. Lifestyle Modification (First-line for all)

Even a 5-10% reduction in body weight significantly improves menstrual regularity, ovulation rates, and androgen levels in overweight women. Diet and exercise improve insulin sensitivity and are foundational to all other treatments.

2. Not Desiring Pregnancy

Combined oral contraceptives (COCs): First-line for menstrual regulation, endometrial protection, and treatment of acne/hirsutism
Intermittent progestins (e.g., medroxyprogesterone acetate 5-10 mg for 10-14 days/month): Protects the endometrium from hyperplasia in anovulatory women
Metformin (1500-2000 mg/day): Suppresses hepatic gluconeogenesis, improves insulin sensitivity, reduces androgens; ovulation may resume in up to 60-70%
Anti-androgens (spironolactone, cyproterone acetate): For hirsutism and acne, usually combined with contraception

3. Desiring Pregnancy (Ovulation Induction)

Letrozole (aromatase inhibitor, 5 mg on days 3-7): Now preferred first-line over clomiphene for ovulation induction - supported by recent evidence
Clomiphene citrate (50 mg days 3-7): Established alternative; ~75-80% of women conceive with medical induction
Gonadotropin injections: Under specialist supervision if oral agents fail
Laparoscopic ovarian drilling (LOD): Surgical option (diathermy or laser punctures) for women who don't respond to medications; achieves unifollicular ovulation but carries a risk of adhesions

4. Emerging Treatments

Recent meta-analysis (2024) shows GLP-1 receptor agonists (e.g., semaglutide) are effective in PCOS women with obesity for weight loss and hormonal regulation - PMID: 39178623. Probiotics and synbiotics also show promise for insulin resistance management - PMID: 39599701.

Key Points Summary

PCOS = diagnosis of exclusion; requires 2 of 3 Rotterdam criteria
Core mechanism: insulin resistance + androgen excess + anovulation
Affects 6-12% of reproductive-age women; >50% develop T2DM by age 40
Manage based on patient goals: cycle control, fertility, androgen symptoms, metabolic risk
Lifestyle change is always first-line regardless of presenting complaint

Sources: Goldman-Cecil Medicine (p. 2560), Berek & Novak's Gynecology (p. 1879), Dermatology 5e - Diagnostic Flowchart

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