Clinical Review

2023 Update on obstetrics

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References

Evaluating and treating headaches in pregnancy and postpartum

American College of Obstetricians and Gynecologists. Clinical practice guideline no. 3: headaches in pregnancy and postpartum. Obstet Gynecol. 2022;139:944-972.

For obstetricians, headaches are a common and often frustrating condition to treat, as many of the available diagnostic tools and medications are either not recommended or have no data on use in pregnancy and lactation. Additionally, a headache is not always just a headache but could be a sign of a time-sensitive serious complication. An updated guideline from the American College of Obstetricians and Gynecologists approaches the topic of headaches in a stepwise algorithm that promotes efficiency and efficacy in diagnosis and treatment.11

Types of headaches

The primary headache types—migraine, cluster, and tension—are distinguished from each other by patient characteristics, quality, duration, location, and related symptoms. Reassuringly, headache frequency decreases by 30% to 80% during pregnancy, which allows for the option to decrease, change, or stop current medications, ideally prior to pregnancy. Prevention via use of calcium channel blockers, antihistamines, or β-blockers is recommended, as requiring acute treatments more than 2 days per week increases the risk of medication overuse headaches.

Treating acute headache

For patients who present with an acute headache consistent with their usual type, treatment starts with known medications that are compatible with pregnancy and proceeds in a stepwise fashion:

1. Acetaminophen 1,000 mg orally with or without caffeine 130 mg orally (maximum dose, acetaminophen < 3.25–4 g per day, caffeine 200 mg per day)

2. Metoclopramide 10 mg intravenously with or without diphenhydramine 25 mg intravenously (for nausea and to counteract restlessness and offer sedation)

3. If headache continues after steps 1 and 2, consider the following secondary treatment options: magnesium sulfate 1–2 g intravenously, sumatriptan 6 mg subcutaneously or 20-mg nasal spray, ibuprofen 600 mg orally once, or ketorolac 30 mg intravenously once (second trimester only)

4. If continued treatment and/or hospitalization is required after step 3, steroids can be used: prednisone 20 mg 4 times a day for 2 days or methylprednisolone 4-mg dose pack over 6 days

5. Do not use butalbital, opioids, or ergotamines due to lack of efficacy in providing additional pain relief, potential for addiction, risk of medication overuse headaches, and association with fetal/ pregnancy abnormalities.

Consider secondary headache

An acute headache discordant from the patient’s usual type or with concerning symptoms (“red flags”) requires consideration of secondary headaches as well as a comprehensive symptom evaluation, imaging, and consultation as needed. While secondary headaches postpartum are most likely musculoskeletal in nature, the following symptoms need to be evaluated immediately:

  • rapid onset/change from baseline
  • “thunderclap” nature
  • hypertension
  • fever
  • focal neurologic deficits (blurry vision or blindness, confusion, seizures)
  • altered consciousness
  • laboratory abnormalities.

The differential diagnosis includes preeclampsia, reversible cerebral vasoconstriction syndrome (RCVS), posterior reversible encephalopathy syndrome (PRES), infection, cerebral venous sinus thrombosis (CVST), post–dural puncture (PDP) headache, idiopathic intracranial hypertension (IIH), and less likely, carotid dissection, subarachnoid hemorrhage, intracranial hemorrhage, pituitary apoplexy, or neoplasm.

Treatment. Individualized treatment depends on the diagnosis. Preeclampsia with severe features is treated with antihypertensive medication, magnesium sulfate, and delivery planning. PDP headache is treated with epidural blood patch, sphenopalatine block, or occipital block with an anesthesiology consultation. If preeclampsia and PDP are ruled out, or if there are more concerning neurologic features, imaging is essential, as 25% of pregnant patients with acute headaches will have a secondary etiology. Magnetic resonance imaging without contrast is preferred due to concerns about gadolinium crossing the placenta and the lack of data on long-term accumulation in fetal tissues. Once diagnosed on imaging, PRES and RCVS are treated with antihypertensives and delivery. CVST is treated with anticoagulation and a thrombophilia workup. IIH may be treated with acetazolamide after 20 weeks or serial lumbar punctures. Intracranial vascular abnormalities may be treated with endoscopic resection and steroids. ●

WHAT THIS EVIDENCE MEANS FOR PRACTICE

Calcium channel blockers and antihistamines are recommended for primary headache prevention.

Acetaminophen, caffeine, diphenhydramine, and metoclopramide administered in a stepwise manner are recommended for acute treatment of primary headache in pregnancy. Nonsteroidal antiinflammatory agents and triptans may be added during lactation and postpartum.

Butalbital and opioids are not recommended for acute treatment of headaches in pregnancy and postpartum due to risk of medication overuse headaches, dependence, and neonatal abstinence syndrome.

“Red flag” headache symptoms warrant imaging, prompt treatment of severe hypertension, and timely treatment of potentially life-threatening intracranial conditions.

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