A 28-year-old woman attends the family planning clinic requesting oral contraception. She has a 5-year history of migraine with aura (visual flashing and fortification scotomas preceding headache by 30 minutes). Her menarche was at age 12, and she has regular 28-day cycles. General examination is unremarkable; blood pressure is 118/76 mmHg. She is otherwise healthy with no significant past medical history. Which of the following is the most appropriate contraceptive choice for this patient?

Explanation

## Clinical Assessment This patient has **migraine with aura**, which is a critical contraindication to estrogen-containing contraceptives due to the significantly elevated risk of ischemic stroke. ### Why Estrogen is Contraindicated **Key Point:** Migraine with aura is a relative contraindication to combined oral contraceptive pills (COCPs) and other estrogen-containing methods. The mechanism involves: - Estrogen-induced prothrombotic state (increased factors V, VII, X; decreased antithrombin III) - Migraine with aura as an independent stroke risk factor - Combined effect increases ischemic stroke risk 4–8 fold [cite:WHO Medical Eligibility Criteria] **High-Yield:** The WHO classifies estrogen use in migraine with aura as **Category 3–4** (unacceptable or contraindicated), depending on other risk factors. ### Why Progestin-Only Pill is Correct The **progestin-only pill (POP)**, particularly modern formulations like desogestrel 75 µg, is the ideal choice because: 1. **No estrogen** — eliminates prothrombotic effects 2. **Efficacy comparable to COCP** — desogestrel-based POP has typical use failure rate ~0.4%, similar to COCPs 3. **Maintains cycle regularity** — desogestrel suppresses ovulation in ~97% of cycles, unlike older POPs 4. **Safe in migraine with aura** — WHO Category 1 (no restrictions) **Clinical Pearl:** Desogestrel POP is superior to older POPs (norethisterone, levonorgestrel) because it reliably inhibits ovulation, making it as effective as COCPs while avoiding estrogen. ### Why Other Options Are Wrong | Option | Why Unsuitable | |--------|----------------| | Copper IUD | Non-hormonal, highly effective, but does not address the need for hormonal contraception if patient prefers it; however, it IS an acceptable alternative if she declines hormonal methods. | | Transdermal patch | Contains estrogen (norelgestromin + ethinyl estradiol); carries same stroke risk as oral estrogen in migraine with aura. | **Mnemonic:** **ESTROGEN-AURA = STROKE** — Remember that estrogen + aura = increased thrombotic risk; avoid all estrogen-containing methods.