HRT and Migraine with Aura

Introduction to HRT and Migraine

The American College of Cardiology and other guideline societies recommend that hormone replacement therapy (HRT) is not contraindicated in women with migraine with aura, but requires careful risk stratification and should be administered as transdermal estrogen at the lowest effective dose, never in combination with smoking or other stroke risk factors 1, 2

Combined hormonal contraceptives are absolutely contraindicated in women with migraine with aura due to a 7-fold increased stroke risk (RR 7.02; 95% CI 1.51-32.68) 3, 4, 2
Postmenopausal HRT is NOT contraindicated but requires specific formulation and dosing strategies 3, 4

Migraine with aura increases ischemic stroke risk 2.5-fold (RR 2.51; 95% CI 1.52-4.14) 4
High migraine frequency (>weekly attacks) further amplifies risk (HR 4.25; 95% CI 1.36-13.29) 4, 1
The absolute risk translates to approximately 4 additional intracranial hemorrhage events per 10,000 women per year 3, 4

Active smoking creates catastrophic stroke risk (RR 9.03; 95% CI 4.22-19.34) when combined with migraine and estrogen 3, 4, 2
Age <45 years has a pronounced stroke risk (RR 3.65; 95% CI 2.21-6.04) 3, 4
Uncontrolled hypertension compounds baseline stroke risk 1, 2
Known thrombophilia or hypercoagulable state dramatically increases thrombotic events 1, 5
Two or more additional stroke risk factors present simultaneously (diabetes, hyperlipidemia, hypertension) 1, 2

High frequency (>weekly attacks) of migraine with aura requires initiation of migraine prophylaxis before considering HRT 4, 1
Tobacco use is an absolute contraindication 3, 4
Age <45 years is a relative contraindication 3, 4

Initiate prophylaxis first to reduce aura frequency and thereby decrease baseline stroke risk 1
Propranolol 80-160 mg daily or topiramate 50-100 mg daily are first-line options 1

Monitor blood pressure at every visit 1, 2
Reassess migraine frequency every 3-6 months 1
Educate on stroke warning signs and distinguish from typical aura (sudden vs. gradual onset, simultaneous vs. successive symptoms) 5
If aura frequency increases or new neurological symptoms develop, discontinue HRT immediately and evaluate for stroke 5