Which of the following is the most common serious complication of spinal anesthesia occurring within 48 hours post-procedure?

Explanation

## Post-Dural Puncture Headache (PDPH) — Most Common Serious Complication **Key Point:** **Post-dural puncture headache (PDPH)** is the most common serious complication of spinal anesthesia, occurring in 10–50% of cases (depending on needle type and technique). ### PDPH: Epidemiology and Timeline | Feature | Details | | --- | --- | | **Incidence** | 10–50% (higher with large-bore, cutting needles) | | **Onset** | 24–48 hours post-procedure (can occur up to 7 days) | | **Pathophysiology** | CSF leak through dural puncture → decreased CSF pressure → traction on meninges | | **Severity** | Mild to debilitating; 80% resolve within 2 weeks | ### Clinical Features of PDPH 1. **Positional headache** — Worse when upright, better when supine 2. **Associated symptoms** — Neck stiffness, tinnitus, hearing loss, visual disturbances 3. **Onset timing** — Within 24–48 hours (classic presentation) ### Risk Factors for PDPH - **Needle gauge** — Larger bore (18G) > smaller bore (25G, 27G) - **Needle type** — Cutting (Quincke) > pencil-point (Whitacre, Sprotte) - **Patient factors** — Young age, female sex, low BMI, pregnancy - **Technique** — Multiple puncture attempts, bevel orientation **High-Yield:** PDPH is the **most common serious complication** of spinal anesthesia and is a frequent NEET PG question. The classic teaching point is the **positional nature** of the headache. **Clinical Pearl:** Conservative management (bed rest, hydration, NSAIDs, caffeine) resolves 80% of cases within 2 weeks. Epidural blood patch (EBP) is the definitive treatment for persistent PDPH. ### Why Other Options Are Incorrect **Transient Neurological Symptoms (TNS):** - Occurs in 1–16% of cases (less common than PDPH) - Presents as **buttock/leg pain** within 24 hours - Self-limited, resolves within 1 week - Not classified as "serious" in the same way as PDPH **Spinal Hematoma:** - Rare (1 in 150,000–220,000) - Occurs in anticoagulated patients or those with coagulopathy - Presents with neurological deficits, not headache **Meningitis:** - Rare (1 in 40,000–50,000) - Requires bacterial contamination - Presents with fever, neck stiffness, altered mental status - Much less common than PDPH