What is the appropriate admission plan for a patient with a subdural hematoma?

Admission Plan for Subdural Hematoma

All patients with subdural hematoma require hospital admission, with ICU-level monitoring indicated for acute SDH >10mm thickness or >5mm midline shift, GCS <9, coagulopathy, or any SDH requiring surgical intervention 1, 2.

Initial Assessment and Stabilization

Upon admission, immediately obtain:

• Head CT to quantify hematoma size, thickness, and midline shift
• Laboratory workup: PT, PTT, INR, platelet count 3
• Glasgow Coma Scale (GCS) score
• Neurological examination focusing on pupillary response and motor function

If the patient is comatose (GCS <9) with severe TBI:

• Control airway immediately via tracheal intubation with mechanical ventilation
• Monitor end-tidal CO2 continuously to maintain normocapnia and avoid cerebral ischemia from hypocapnia 1
• Correct any secondary brain insults

Triage Algorithm Based on SDH Characteristics

ICU Admission Required:

1. Acute SDH with surgical indications 1, 2:

   • Thickness >5mm AND midline shift >5mm
   • Any thickness if GCS <9
   • GCS drop ≥2 points from injury to admission
   • Asymmetric or fixed dilated pupils
   • ICP >20 mmHg

2. Large SDH (>10 cm³ volume) - these patients demonstrate poor clinical courses and require intensive monitoring 4

3. Coagulopathy present - 5-fold increased risk of critical care interventions 5

4. Multiple intracranial hemorrhages in addition to SDH 4

Step-Down/Monitored Floor Admission Acceptable:

• Small isolated traumatic SDH (<10 cm³ volume) with:
  • GCS 13-15
  • No coagulopathy
  • No additional intracranial hemorrhages
  • Neurologically and medically stable 4

Important caveat: Isolated antiplatelet use alone is NOT a predictor of need for ICU admission and should not be used as sole criterion for ICU triage 5. However, anticoagulation or documented coagulopathy requires ICU-level care.

Immediate Neurosurgical Consultation

Obtain urgent neurosurgical evaluation for:

• Any acute SDH with thickness >10mm or midline shift >5mm (regardless of GCS) 2
• Comatose patients (GCS <9) with any SDH 2
• Rapidly deteriorating neurological exam 6
• Unilaterally or bilaterally dilated nonreactive pupils 6
• Extensor posturing 6

Coagulopathy Management

Reverse immediately if present 3:

• Warfarin: Vitamin K + prothrombin complex concentrate (PCC) or fresh frozen plasma
• Direct oral anticoagulants: Specific reversal agents (idarucizumab for dabigatran, andexanet alfa for factor Xa inhibitors)
• Thrombocytopenia: Platelet transfusion to achieve count >50,000-75,000/μL for surgery 7

ICP Monitoring

Place ICP monitor in 1:

• All comatose patients (GCS <9) with acute SDH
• Patients with refractory intracranial hypertension despite sedation

If ICP remains elevated despite first-line treatment, consider external ventricular drainage 1.

Conservative Management Protocol (Non-surgical Cases)

For small SDH not meeting surgical criteria:

• Neurological checks every 1-2 hours initially, then every 4 hours if stable
• Serial CT imaging: Repeat at 24 hours if GCS remains <15, or sooner if neurological deterioration 8
• Seizure prophylaxis: Consider in acute phase (institutional variation)
• Avoid routine repeat CT if initial CT negative and patient neurologically stable - risk of delayed complications is very low (0.04-0.3%) 8

Common Pitfalls to Avoid

1. Do not discharge patients with SDH on initial CT, even if small - admission for observation is mandatory
2. Do not assume all anticoagulated patients need ICU - isolated antiplatelet therapy alone does not predict need for critical interventions 5
3. Do not delay coagulopathy reversal - this is time-critical to prevent hematoma expansion
4. Do not perform routine repeat CT in stable patients with negative initial scan - very low yield and unnecessary radiation 8
5. Do not use burr holes for acute SDH - craniotomy with or without craniectomy is the appropriate surgical approach 2, 6