Post-dural puncture headache (PDPH) occurs after unintentional dural puncture with an epidural needle. Which of the following correctly identifies the mechanism and optimal therapeutic measure when conservative treatment fails?

• A Increased CSF pressure; epidural morphine
• B Meningeal irritation from epidural drugs; high-dose oral caffeine
• C Cortical spreading depression; sumatriptan
• D CSF leakage causing intracranial hypotension and traction on pain-sensitive structures; epidural blood patch ✓

Explanation

PDPH results from CSF leakage through the dural puncture site exceeding CSF production, causing intracranial hypotension. The brain sags, stretching pain-sensitive structures (meninges, bridging veins, cranial nerves). Headache is characteristically postural — worse upright, relieved supine. Conservative management includes bed rest, hydration, and caffeine. When symptoms persist >24–48 hours or are severe, epidural blood patch (autologous blood 15–20 mL injected at or below the puncture level) is the gold standard with ~90% success. The risk of PDPH is much higher with large-gauge cutting (epidural) needles than with pencil-point spinal needles (Whitacre).

Reference: Morgan & Mikhail's Clinical Anesthesiology, 6th ed.

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Written and medically reviewed by the StethoPrep medical team.