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RTA with Post-Traumatic Convulsion - Complete Clinical Analysis

Patient Summary

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Diagnosis

1. Early post-traumatic seizure (occurring within 7 days of injury) - this is the acute event
2. Underlying TBI severity needs to be graded (mild, moderate, severe)
3. The history of seizures 8 years ago raises the question of pre-existing epilepsy vs. a previous provoked seizure

• Epidural hematoma (EDH) - arterial bleed, classically with lucid interval, then rapid deterioration
• Subdural hematoma (SDH) - bridging vein rupture, especially with deceleration injury
• Intracerebral hemorrhage (ICH)
• Diffuse axonal injury (DAI)
• Subarachnoid hemorrhage (SAH)
• Skull fracture (depressed or basilar)
• Cervical spine injury (must be assumed until ruled out in all RTA patients)

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Pathophysiology

Why Does a Seizure Happen After Head Trauma?

1. Cortical spreading depolarization - traumatic impact causes excessive glutamate release and mass neuronal depolarization
2. Cortical contusion - direct injury to brain cortex acts as an irritative focus
3. Hemorrhage - blood products (especially hemoglobin breakdown products like hemosiderin) are epileptogenic - they irritate the cortex
4. Cerebral edema - raises ICP and disrupts neuronal homeostasis
5. Ionic imbalance - sodium, potassium, and calcium shifts after cellular injury lower the seizure threshold

• Pain/anxiety response
• Raised ICP beginning (early Cushing response - rising BP before bradycardia appears)
• Hemorrhagic compensation phase

Classification of Post-Traumatic Seizures

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Clinical Assessment

Glasgow Coma Scale (GCS) - First Priority

• Eye opening (E): 1-4
• Verbal response (V): 1-5
• Motor response (M): 1-6

Signs to Watch For

• Cushing's Triad: Rising BP + bradycardia + irregular breathing = impending herniation
• Pupil changes: Unilateral fixed dilated pupil = uncal herniation (emergency)
• Signs of basilar skull fracture:
  • Raccoon eyes (periorbital ecchymosis)
  • Battle's sign (post-auricular ecchymosis)
  • Hemotympanum
  • CSF rhinorrhea/otorrhea

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Investigations

Immediate (Emergency)

1. Non-contrast CT head - first-line imaging in all head trauma cases
   • Identifies hematomas, contusions, fractures, midline shift
   • CT scan is indicated given: seizure + RTA + hypertension
2. CT cervical spine - RTA mandates cervical spine clearance
3. FAST ultrasound - to rule out intra-abdominal bleeding
4. Bloods: CBC, BMP (electrolytes), blood glucose, PT/INR, type & screen, blood alcohol
5. ABG if GCS is low
6. ECG - rule out cardiac arrhythmia

Additional

• MRI brain (when stable) - better for detecting DAI, contusions, small bleeds
• EEG - especially given past history of seizures; assess for ongoing subclinical seizure activity

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Treatment

1. Pre-hospital / Initial Stabilization (ABCDE)

• Airway: If GCS ≤8, intubate (rapid sequence intubation). Avoid nasotracheal route if skull base fracture suspected
• Cervical spine: Immobilize with hard collar immediately - assume instability until cleared
• Breathing: Maintain SpO2 >95%, PaCO2 35-40 mmHg (avoid hyperventilation prophylactically)
• Circulation: Maintain systolic BP >90 mmHg (target >100 mmHg in adults). Use isotonic fluids (normal saline or PlasmaLyte). Avoid D5W or hypotonic saline - worsens cerebral edema
• Disability: GCS, pupils, motor response

2. Seizure Management

• First line: IV benzodiazepine - lorazepam 0.1 mg/kg IV or diazepam 5-10 mg IV
• Second line: IV phenytoin 20 mg/kg (at 50 mg/min or slower) OR levetiracetam 20-30 mg/kg IV
• Refractory seizures: Propofol or midazolam infusion, with EEG monitoring

• Anticonvulsant prophylaxis is recommended for 7 days following moderate-to-severe TBI to prevent early post-traumatic seizures
• Phenytoin is traditionally used (sodium channel blocker, well-studied in TBI)
• Levetiracetam is increasingly preferred due to fewer drug interactions and easier monitoring (no level monitoring needed in many protocols)
• Prophylaxis beyond 7 days is NOT recommended unless late seizures occur

3. Raised ICP Management

• Head of bed elevation to 30 degrees
• Adequate analgesia and sedation (prevents ICP spikes)
• Hyperosmolar therapy:
  • Mannitol 0.5-1 g/kg IV (for acute herniation; monitor serum osmolality)
  • 3% hypertonic saline 2-5 mL/kg over 15 minutes (preferred in hypotensive patients)
• Avoid prophylactic hyperventilation (PaCO2 <30 mmHg) - causes vasoconstriction and ischemia
• Avoid corticosteroids in TBI - shown to increase mortality (CRASH trial)

4. Neurosurgical Intervention

• Epidural hematoma - surgical evacuation (craniotomy) as emergency
• Large acute SDH (clot >10 mm or midline shift >5 mm)
• Depressed skull fracture (depressed >thickness of skull)
• Deteriorating GCS despite medical management

5. General Supportive Care

• Normoglycemia - both hypo- and hyperglycemia worsen brain injury
• Normothermia (35-38°C) - fever increases metabolic demand
• Hemoglobin >7 g/dL (transfuse if needed; avoid >10 g/dL)
• Stress ulcer prophylaxis: pantoprazole 40 mg/day or famotidine 20 mg/day
• Early enteral nutrition within 24-48 hours via NG/ND tube
• DVT prophylaxis when safe
• Avoid D5W/hypotonic saline - worsens cerebral edema

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Addressing the Past History of Convulsions

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Condition Severity Assessment

• Seizure after RTA = significant cortical injury or intracranial pathology until proven otherwise
• Tachycardia (105 bpm) = needs monitoring for ongoing bleed or raised ICP
• Mild hypertension (123/90) = monitor trend (rising BP + falling HR = Cushing's response = emergency)
• Young male with RTA = high-energy mechanism, high-velocity injury likely

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Summary

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