A 72-year-old woman on warfarin for atrial fibrillation presents with acute onset of severe headache, vomiting, and progressive drowsiness. Her husband reports she fell at home 3 days ago but did not lose consciousness. On examination, she is drowsy (GCS 13), with a blood pressure of 165/95 mmHg and an INR of 8.2. Non-contrast CT brain shows a crescent-shaped hyperdense collection over the left frontal convexity with midline shift. What is the most appropriate immediate management?

Explanation

## Management of Anticoagulation-Related Subdural Hematoma ### Clinical Diagnosis: Acute Subdural Hematoma (Anticoagulation-Related) **Key Point:** A crescent-shaped hyperdense collection over the convexity on CT is pathognomonic for acute subdural hematoma (SDH). In an anticoagulated patient with supratherapeutic INR and signs of increased intracranial pressure (drowsiness, midline shift), this is a neurosurgical emergency requiring urgent reversal of anticoagulation and surgical evacuation. ### Pathophysiology of Subdural Hematoma 1. **Mechanism:** Tearing of bridging veins between brain surface and dural venous sinuses. 2. **Risk factors:** Head trauma (even minor in elderly), anticoagulation, thrombocytopenia, coagulopathy. 3. **Anticoagulation effect:** Warfarin prolongs bleeding time and increases hematoma expansion risk; supratherapeutic INR (>4) significantly worsens prognosis. 4. **Clinical course:** Gradual accumulation of blood over hours to days, causing mass effect and midline shift. ### Imaging Features | Feature | Acute SDH | Chronic SDH | Epidural Hematoma | |---------|-----------|-------------|-------------------| | **Shape** | Crescent (follows brain contour) | Crescent | Lens-shaped (biconvex) | | **Density on CT** | Hyperdense | Hypodense/isodense | Hyperdense | | **Location** | Over convexity (subdural space) | Over convexity | Between skull and dura | | **Midline shift** | Present if large | May be present | Present if large | | **Crossing sutures** | No (follows dural attachments) | No | Yes (does not cross sutures) | **High-Yield:** The crescent shape and location over the convexity (not crossing sutures) distinguish SDH from epidural hematoma. ### Immediate Management Algorithm ```mermaid flowchart TD A["Anticoagulated patient with acute SDH + midline shift"]:::outcome --> B{"GCS < 14 or mass effect?"}:::decision B -->|Yes| C["Immediate anticoagulation reversal"]:::action C --> D["FFP 10-15 mL/kg OR PCC if available"]:::action D --> E["Vitamin K 10 mg IV"]:::action E --> F["Urgent neurosurgical consultation"]:::action F --> G["Burr holes or craniotomy for evacuation"]:::action B -->|No, stable| H["Anticoagulation reversal + close monitoring"]:::action H --> I["Repeat CT in 6-12 hours"]:::action I --> J{"Hematoma expansion?"}:::decision J -->|Yes| G J -->|No| K["Continue conservative management"]:::outcome ``` ### Anticoagulation Reversal Strategy **Key Point:** In warfarin-related intracranial hemorrhage with INR >4, immediate reversal is mandatory. 1. **Fresh Frozen Plasma (FFP):** 10–15 mL/kg IV over 15–30 minutes. - Contains factors II, VII, IX, X. - Slower onset (30–60 minutes). - Volume overload risk in elderly patients. 2. **Prothrombin Complex Concentrate (PCC):** 25–50 units/kg (preferred if available). - Concentrated factors II, VII, IX, X. - Faster onset (15–30 minutes). - Less volume expansion. - **Preferred over FFP** in most guidelines. 3. **Vitamin K:** 10 mg IV (slow infusion over 10 minutes). - Onset 12–24 hours. - Must be combined with FFP/PCC for immediate effect. - Do NOT give IV bolus (thrombosis risk). **Clinical Pearl:** Vitamin K alone is insufficient for acute life-threatening bleeding; it must be paired with FFP or PCC for immediate reversal. ### Surgical Indications - **Acute SDH with midline shift and GCS ≤ 8:** Urgent evacuation (burr holes or craniotomy). - **Acute SDH with mass effect (midline shift >5 mm):** Urgent evacuation. - **Acute SDH with volume >30 mL:** Evacuation recommended. - **Acute SDH with GCS 9–12 and midline shift:** Consider evacuation vs. close monitoring based on trajectory. **High-Yield:** In this case, the patient has GCS 13 with midline shift—this is borderline but warrants urgent neurosurgical consultation and likely evacuation given the anticoagulation context and risk of rapid deterioration. ### Why This Is Not the Other Options - **Observation alone:** Dangerous in anticoagulated patient with midline shift; hematoma will likely expand, leading to herniation. - **Vitamin K alone:** Too slow (12–24 hours); patient needs immediate reversal with FFP/PCC. - **Thrombolysis:** Absolutely contraindicated in acute intracranial hemorrhage; will worsen bleeding. - **Lumbar puncture:** Contraindicated in patient with mass effect and midline shift (risk of herniation); CT already rules out meningitis.