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Monday, August 11, 2025

Menopause


Definition
Menopause is the permanent cessation of menstruation resulting from the loss of ovarian follicular activity. It is a natural biological process that marks the end of a woman's reproductive years. The diagnosis is made retrospectively after 12 consecutive months of amenorrhoea without any other pathological or physiological cause.


Epidemiology

  • The average age of menopause is 50–52 years.

  • It usually occurs between ages 45 and 55.

  • Premature menopause: before age 40.

  • Early menopause: between ages 40 and 45.


Pathophysiology

Menopause occurs due to depletion of ovarian follicles and reduced estrogen and progesterone production. This leads to:

  • Elevated follicle-stimulating hormone (FSH) and luteinising hormone (LH) levels due to loss of negative feedback.

  • Decreased estrogen levels causing vasomotor symptoms, urogenital atrophy, and bone loss.


Stages of Menopause

  1. Perimenopause

    • Transitional period with irregular cycles and onset of menopausal symptoms.

  2. Menopause

    • Final menstrual period, confirmed after 12 months without menstruation.

  3. Postmenopause

    • Time after menopause, with continued low estrogen levels and increased long-term health risks.


Symptoms

Vasomotor Symptoms

  • Hot flushes (sudden feelings of heat, flushing, sweating).

  • Night sweats.

Genitourinary Symptoms

  • Vaginal dryness, itching, burning.

  • Dyspareunia (painful intercourse).

  • Recurrent urinary tract infections.

  • Urinary urgency and frequency.

Psychological Symptoms

  • Mood swings, irritability.

  • Anxiety, depression.

  • Poor concentration, memory changes.

Other Symptoms

  • Sleep disturbances.

  • Joint and muscle aches.

  • Skin and hair changes.


Complications

  • Osteoporosis: due to reduced bone mineral density.

  • Cardiovascular disease: loss of estrogen increases risk.

  • Urogenital atrophy: progressive thinning and inflammation of vaginal and urinary tract tissues.


Diagnosis

  • Clinical diagnosis: based on history and 12 months of amenorrhoea in women over 45 years.

  • Laboratory tests: not routinely needed, but FSH may be measured in women <45 years or when diagnosis is uncertain (FSH usually >40 IU/L).


Management

1. Lifestyle Modifications

  • Maintain healthy weight.

  • Regular exercise (weight-bearing for bone health).

  • Balanced diet rich in calcium and vitamin D.

  • Avoid triggers for hot flushes (alcohol, caffeine, spicy foods).

  • Smoking cessation.


2. Pharmacological Treatment

Hormone Replacement Therapy (HRT)

  • Most effective treatment for vasomotor symptoms.

  • Choice depends on presence of uterus:

    • With uterus: Combined estrogen + progestogen to prevent endometrial hyperplasia.

    • Without uterus: Estrogen alone.

Common HRT Options and Doses

  • Estradiol (oral): 1–2 mg once daily.

  • Conjugated estrogens (oral): 0.3–0.625 mg once daily.

  • Estradiol (transdermal patch): 25–100 micrograms/day, changed twice weekly.

  • Progesterone (micronised, oral): 100 mg daily or 200 mg nightly for 12–14 days each month.

  • Medroxyprogesterone acetate: 5–10 mg daily for 12–14 days/month.

Non-hormonal Options for Vasomotor Symptoms (for women who cannot take HRT)

  • Venlafaxine: 37.5–75 mg daily.

  • Paroxetine: 10–20 mg daily.

  • Gabapentin: 300 mg at night, increasing to 300 mg three times daily as tolerated.

  • Clonidine: 25–50 micrograms twice daily.


3. Urogenital Symptoms

Local Estrogen Therapy

  • Estriol vaginal cream: 0.5 mg nightly for 2–3 weeks, then twice weekly.

  • Estradiol vaginal tablet: 10 micrograms daily for 2 weeks, then twice weekly.

  • Estradiol vaginal ring: releases 7.5 micrograms/day for 90 days.


4. Osteoporosis Prevention and Treatment

  • Calcium: 1000–1200 mg/day.

  • Vitamin D: 800–1000 IU/day.

  • Bisphosphonates (if indicated): e.g., Alendronic acid 70 mg once weekly.

  • Selective estrogen receptor modulators (SERMs): e.g., Raloxifene 60 mg daily.


Contraindications to HRT

  • History of breast or endometrial cancer.

  • Active or recent thromboembolic disease.

  • Undiagnosed vaginal bleeding.

  • Severe liver disease.


Monitoring

  • Annual review of symptom control, side effects, and risk factors.

  • Regular breast screening.

  • Blood pressure and cardiovascular risk assessment.




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