A 42-year-old woman undergoes elective cesarean section under spinal anesthesia. The procedure is uneventful, and she is discharged on postoperative day 2. On day 5, she develops a positional headache (worse when sitting/standing, better when lying flat), accompanied by neck stiffness and auditory symptoms (tinnitus). Vital signs are stable. What is the most likely diagnosis and the recommended initial management?

Explanation

## Diagnosis: Post-Dural Puncture Headache (PDPH) **Key Point:** PDPH is the most common neurological complication of spinal anesthesia, occurring in 0.1–0.5% of procedures (higher with larger gauge needles, traumatic puncture, or younger age). **Clinical Pearl:** The classic triad is positional headache (worse upright, better supine), neck stiffness, and auditory symptoms (tinnitus, hearing loss) due to CSF leakage through the dural puncture site and downward sagging of intracranial contents. ### Pathophysiology Dural puncture → CSF leakage into epidural space → decreased CSF pressure and volume → traction on pain-sensitive intracranial structures (meninges, cranial nerves) and decreased CSF cushioning. ### Clinical Features | Feature | PDPH | | --- | --- | | **Onset** | 24–48 hours post-procedure (range: hours to 2 weeks) | | **Character** | Positional (worse sitting/standing, better supine) | | **Associated symptoms** | Neck stiffness, tinnitus, hearing loss, photophobia, nausea | | **Vital signs** | Usually normal | | **CSF findings** | Normal (if LP performed) | ### Management Algorithm ```mermaid flowchart TD A[PDPH suspected]:::outcome --> B[Confirm positional nature]:::decision B -->|Yes| C[Conservative management]:::action C --> D[Bed rest, hydration, analgesics] D --> E{Resolves in 7-10 days?}:::decision E -->|Yes| F[Discharge, reassure]:::outcome E -->|No| G[Epidural blood patch]:::action G --> H[Relief in 70-90% of cases]:::outcome B -->|No/Atypical| I[Consider alternative diagnosis]:::decision I --> J[Meningitis, subdural hematoma]:::urgent ``` ### Initial Management (First-Line) 1. **Bed rest** — reduces CSF leakage 2. **Hydration** — increases CSF production (oral or IV fluids) 3. **Analgesics** — paracetamol, NSAIDs, or opioids as needed 4. **Caffeine** — 500 mg PO/IV (increases cerebral vasoconstriction and CSF production); some evidence supports use 5. **Reassurance** — 80% resolve spontaneously within 7–10 days ### Definitive Management (If Conservative Fails) **Epidural blood patch (EBP):** Injection of 15–20 mL autologous blood into epidural space at or near puncture level → immediate increase in epidural pressure and sealing of dural defect. Success rate: 70–90% on first attempt; 95% after second attempt. **High-Yield:** EBP is indicated if PDPH persists beyond 7–10 days or is severe/disabling. **Warning:** Do NOT confuse PDPH with meningitis — meningitis presents with fever, altered mental status, and CSF pleocytosis; PDPH is afebrile with normal CSF.