After surgical menopause, the cardiovascular excess clusters before 45

Design

Systematic review and meta-analysis of 36 observational studies and trials; random-effects pooled hazard ratios

Population

2,617,942 women with iatrogenic menopause vs naturally menopausal or age-matched controls; median follow-up 16 years

Primary outcome

Cardiovascular morbidity, cardiovascular and all-cause mortality, with age at menopause as moderator

Effect

Stroke HR 1.22 (1.15–1.28); coronary heart disease 1.48 (1.07–2.03); mortality excess only before 45 (cardiovascular mortality 1.20, 1.04–1.37)

Pooled data from 36 studies and 2,617,942 women compared iatrogenic menopause — from bilateral oophorectomy, pelvic radiotherapy or chemotherapy — with natural or age-matched menopause, over a median 16 years of follow-up. Iatrogenic menopause was associated with higher all-cause mortality, cardiovascular events, coronary heart disease and, most consistently, stroke.

The important nuance is age. The mortality excess was confined to women whose menopause occurred before 45; at or after 45 the estimates were null. Each 5-year rise in age at iatrogenic menopause tracked with lower composite cardiovascular risk. This points to a window of elevated risk below 45 rather than a single threshold.

In clinic, this makes age at oophorectomy a cardiovascular risk marker in its own right. For a woman reaching surgical menopause well before the natural age, build cardiovascular review into follow-up and discuss menopausal hormone therapy for symptom control and risk mitigation where it is not contraindicated. The association does not prove that any one action at the time of surgery reverses the risk.

• Stroke showed the most consistent association (pooled hazard ratio 1.22, 95% CI 1.15–1.28); coronary heart disease 1.48 (1.07–2.03).
• Cardiovascular and all-cause mortality excess was confined to menopause before 45 (cardiovascular mortality hazard ratio 1.20, 1.04–1.37); estimates at or after 45 were null.
• Record age at oophorectomy and treat early surgical menopause as a cardiovascular risk factor, not only a bone or vasomotor one.
• Discuss menopausal hormone therapy for women reaching surgical menopause well before the natural age, where not contraindicated.
• Each 5-year rise in age at iatrogenic menopause tracked with lower composite cardiovascular risk (hazard ratio 0.89, 0.83–0.97).

Why it matters

The cardiovascular penalty of surgical menopause is not uniform — it is an age effect, largest under 45 and absent from 45 onward.

Don't overread it

This was observational — it shows association, not that a specific intervention at oophorectomy lowers cardiovascular risk.

The statistics, in plain English

A hazard ratio above 1 means higher risk; because the confidence intervals sit entirely above 1, the stroke and coronary findings are unlikely to be chance. The split by age matters most: below 45 the mortality intervals stay above 1, but at or after 45 they straddle 1, meaning no measurable excess in that group.

Read the rest in the app

You have read your two free briefings this month. The app carries all 27 specialties, every morning, free — and this finding is waiting in it.

Get Daily Doctor — free

Scan to keep reading on your phone. No account needed to start.