A 52-year-old woman is brought to the trauma bay 20 minutes after a motor vehicle collision. She was unrestrained and struck her head on the windshield. On arrival: BP 168/94 mmHg, HR 68/min (bradycardic), RR 28/min, SpO₂ 92% on room air. Neurological examination: eyes open to pain (E2), no verbal response (V1), extends to pain (M3). Left pupil is 5 mm and sluggish; right pupil is 3 mm and brisk. There is blood in the external auditory canal bilaterally. CT head shows a large right epidural hematoma with 8 mm midline shift and uncal herniation. What is the most appropriate immediate intervention?

Explanation

## Clinical Diagnosis: Uncal Herniation from Epidural Hematoma **Key Point:** This patient has **GCS 6** (E2+V1+M3) with **anisocoria** (left pupil 5 mm sluggish, right 3 mm brisk) and **clinical signs of uncal herniation**: bradycardia, hypertension, and respiratory depression (Cushing's triad). The CT confirms a large epidural hematoma with significant midline shift and uncal herniation — a **neurosurgical emergency**. ## Herniation Syndrome Recognition | Sign | Mechanism | Urgency | |------|-----------|----------| | **Anisocoria (blown pupil)** | Ipsilateral CN III compression from uncal herniation | EMERGENT | | **Cushing's triad** (bradycardia, HTN, irregular respirations) | Brainstem compression | EMERGENT | | **Posturing** (extension = M3) | Brainstem involvement | EMERGENT | | **Midline shift >5 mm** | Mass effect | Surgical | **High-Yield:** **Anisocoria + low GCS + mass effect = immediate airway protection + osmotic therapy + emergent OR.** Do not delay for additional imaging or ICU observation. ## Management Algorithm ```mermaid flowchart TD A["GCS ≤ 8 + Herniation signs"]:::outcome --> B{"Airway patent?"}:::decision B -->|"No or at risk"| C["Intubate + Hyperventilate"]:::action B -->|"Yes"| D["Prepare for intubation"]:::action C --> E["Osmotic therapy: Mannitol 1 g/kg IV"]:::action D --> E E --> F["Stat neurosurgery for evacuation"]:::urgent F --> G["Operating room"]:::outcome ``` ## Immediate Interventions 1. **Airway:** Intubate to protect airway (GCS 6) and enable hyperventilation 2. **Hyperventilation:** Target PaCO₂ 30–35 mmHg (temporary measure; causes cerebral vasoconstriction and ↓ ICP) 3. **Osmotic therapy:** Mannitol 1 g/kg IV (or hypertonic saline 3% if hypotensive) — reduces brain water 4. **Neurosurgery:** Emergent evacuation is definitive treatment 5. **Head elevation:** 30 degrees (after airway secured) 6. **Avoid hypoxia/hypercapnia:** Maintain SpO₂ >95%, PaCO₂ 35–40 mmHg (long-term) **Clinical Pearl:** Hyperventilation is a **temporizing measure only** (lasts 24–48 hours); it is not definitive and should not delay surgery. The only definitive treatment for epidural hematoma with herniation is **surgical evacuation**. **Warning:** Do NOT perform needle decompression at the midline (burr hole) — this is outdated and dangerous. Modern neurosurgery requires formal craniotomy or burr holes placed under direct visualization in the OR.