Maternal-Fetal Medicine · Patient Education Series

Idiopathic Intracranial Hypertension in Pregnancy

Understanding Your Diagnosis & Your Care Plan

Dr. C. Onyeije, MFM Specialist
What Is This?

What Is Idiopathic Intracranial Hypertension?

Pressure inside the skull is higher than normal — without a tumor or blockage causing it.

🧠 "Idiopathic" No identifiable structural cause
💧 Elevated CSF Pressure Cerebrospinal fluid builds up around the brain
👁️ Vision Risk Can affect the optic nerve if untreated
What Is This?

IIH Is Rare — But Manageable

👩 Childbearing Age Primarily affects women of reproductive age
⚖️ Weight Gain Gestational weight gain can worsen symptoms
🤰 Not Caused by Pregnancy Pregnancy itself does NOT cause IIH
Most pregnancies with IIH have excellent outcomes
What Is This?

Symptoms to Know

🤕 Daily Headache Pulsating, persistent — most common symptom (~63%)
👁️ Visual Changes Blurred or double vision (~67% of patients)
🌊 Visual Blackouts Brief, transient visual obscurations
🤢 Nausea Often accompanies headache

Symptoms are similar to those experienced outside of pregnancy

Why Does It Matter?

The Main Concern: Protecting Your Vision

Without treatment, increased pressure can damage the optic nerve — the nerve that connects your eye to your brain — and cause permanent vision loss.

Papilledema

Swelling of the optic nerve head — the earliest sign of damage. Detected on eye exam.

Why Early Diagnosis Matters

Catching and treating IIH early prevents vision loss. Regular monitoring is key.

Early diagnosis = vision protection
What Happens Next?

3 Steps to Confirm the Diagnosis

1
🧲 MRI of the Brain
Rules out tumors, clots, or other causes. No contrast dye is used in pregnancy.
2
💉 Lumbar Puncture
Measures spinal fluid pressure. A reading >25 cm H₂O confirms elevated pressure.
3
👁️ Ophthalmology Exam
Checks for optic nerve swelling (papilledema) and maps your visual fields.
What Happens Next?

What Is a Lumbar Puncture?

A thin needle is placed in the lower back to measure and sample spinal fluid. It is safe during pregnancy.

How It's Done

  • You lie on your side (lateral decubitus position)
  • Local numbing medicine is used first
  • Pressure is measured before fluid is collected

What It Tells Us

  • Opening pressure >25 cm H₂O = elevated
  • Normal fluid composition confirms IIH
  • Can also provide temporary relief
Performed lying on your side — safe for you and your baby
What Happens Next?

Your Eyes Are a Window to Your Brain

Regular eye exams track the health of your optic nerve throughout your pregnancy.

Visual Field Testing

Maps your peripheral (side) vision. Detects early changes before you notice them.

Also called: automated perimetry

OCT Scan

Optical Coherence Tomography — uses light waves to measure optic nerve thickness. No radiation.

Painless and non-invasive

Painless · Non-invasive · No radiation
What Happens Next?

Treatment Is Tailored to You

Mild Monitoring Weight management + close follow-up
Moderate Medication Acetazolamide after the first trimester
Severe Procedures Serial lumbar punctures or surgery (rare)

Your team will choose the safest option for you and your baby

What Happens Next?

The Main Medication: Acetazolamide

Reduces spinal fluid production. Generally used after the first trimester when it is considered safe.

Benefits

  • Reduces headaches and optic nerve swelling
  • First-line treatment for moderate IIH
  • Well-studied in pregnancy (after 1st trimester)

Important Notes

  • Avoided during the first trimester
  • Discuss breastfeeding plans with your doctor
  • Regular monitoring while on medication
Evidence-based · ACOG/SMFM aligned
What Happens Next?

How Will I Deliver My Baby?

IIH alone does NOT require a cesarean section. Vaginal delivery is the goal.

🤱 Vaginal Delivery Recommended as the standard approach
💉 Regional Anesthesia Epidural or spinal — safe, may even lower pressure
🏥 C-Section Only if needed for standard obstetric reasons
Your delivery plan is based on YOUR needs
Why Does It Matter?

What About My Baby?

IIH does not increase the risk of miscarriage, preterm birth, or preeclampsia.

✅ No increased miscarriage risk
✅ No increased preterm labor risk
✅ No increased preeclampsia risk
👀 Close monitoring throughout pregnancy
Evidence is reassuring for most pregnancies
What Happens Next?

You Have a Full Team Behind You

👩‍⚕️ High-Risk OB Maternal-Fetal Medicine Manages your high-risk pregnancy and coordinates your care
🧠 Neurology Neurologist Manages intracranial pressure and medication decisions
👁️ Eye Care Ophthalmology Monitors optic nerve health and visual fields

Coordinated multidisciplinary care = best outcomes for you and your baby

What Can I Do?

Call Your Doctor If You Notice…

  • Sudden severe headache — "the worst of your life"
  • Rapid vision changes or sudden vision loss
  • New or worsening double vision
  • High blood pressure combined with headache
Do not wait — contact your care team immediately

High blood pressure + headache may indicate preeclampsia — always report this promptly

What Can I Do?

Your Role in Your Care

You are an active partner in your care
Looking Ahead

Vision & Future Pregnancies

With proper management, long-term visual outcomes are generally excellent.

Visual Outcomes

Long-term vision outcomes are comparable to non-pregnant patients with IIH when treatment is received.

Future Pregnancies

Discuss future pregnancy plans with your MFM team before conceiving. Postpartum monitoring continues.

Most women do very well with ongoing care
Summary

What We Know. What We Do. Together.

What Is It?
Elevated Brain Pressure
No structural cause — diagnosed by lumbar puncture and imaging
Why It Matters
Vision Protection
The optic nerve must be monitored and protected throughout pregnancy
What's Next
Monitoring + Safe Delivery
Treatment, regular exams, and vaginal delivery as the goal

Your questions matter. Your care team is here.

Your Care Team

Questions? We Are Here.

👩‍⚕️ MFM Specialist Ask about your overall pregnancy plan and monitoring schedule
👁️ Ophthalmologist Ask about your visual field results and optic nerve health
🧠 Neurologist Ask about medication timing, dosing, and pressure management

Maternal-Fetal Medicine Patient Education  ·  Dr. C. Onyeije, MFM Specialist

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IIH in Pregnancy · Patient Education · MFM