Trauma: Epilepsy - Post Traumatic

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⚡ Key idea: Early post-traumatic seizures (≤7 days after TBI) reflect acute irritation (blood/oedema/metabolic stress). 🔥 Late seizures (>7 days) suggest a developing epileptogenic scar network and are more predictive of PTE (recurrent unprovoked seizures).

🧩 Causes & risk factors (what actually raises PTE risk)

• Primary driver: severity of TBI (risk rises stepwise with structural injury)
• High-risk injury patterns:
  • 🩸 Intracranial haemorrhage (esp. subdural/intraparenchymal) and cortical contusions
  • 🧠 Penetrating injury / retained foreign body
  • 🦴 Depressed skull fracture or fracture with dural breach
  • ⏱️ Prolonged loss of consciousness / severe GCS depression
  • 🧯 Early post-traumatic seizure (marker of cortical irritation; also predicts later epilepsy)
• Secondary “epileptogenic amplifiers”:
  • 🫁 Hypoxia/hypotension (secondary brain injury → more neuronal loss)
  • 🧊 Cerebral oedema / raised ICP (wider peri-lesional injury)
  • 🦠 Infection (meningitis/abscess; inflammation lowers seizure threshold)
  • ⚡ Metabolic derangement (hyponatraemia, hypoglycaemia, uraemia) - often triggers early seizures

👩‍⚕️ Clinical features (timing + semiology)

• Timing (must state in exams):
  • ⏱️ Immediate (<24 h): acute biochemical/cortical irritation
  • 📅 Early (24 h–7 days): acute injury phase
  • 🕰️ Late (>7 days): higher likelihood of future recurrence/PTE
• Seizure types:
  • 🎯 Focal seizures (± impaired awareness) are common with cortical scars/contusions
  • ⚡ Focal to bilateral tonic–clonic seizures may occur
  • 🧩 New focal deficits after a seizure: consider Todd’s paresis vs new bleed/ischaemia
• Associated post-TBI features: headache, cognitive slowing, mood change, sleep disturbance; focal neuro signs depend on lesion site.

🔎 Investigations (what to do, and why)

• Neuroimaging
  • 🖼️ CT head (acute): exclude evolving haemorrhage, contusion expansion, mass effect, skull fracture
  • 🧲 MRI brain (subacute/chronic): better for cortical scarring, gliosis, microhaemorrhage, mesial temporal injury and subtle structural epileptogenic lesions
• EEG
  • 📈 Helps when diagnosis is uncertain, to support focal onset, and to risk-stratify (epileptiform discharges increase recurrence risk)
  • 🧠 If ongoing confusion/low GCS: consider non-convulsive status epilepticus → urgent EEG
• Bloods (always do the basics): glucose, U&E (Na+), Ca/Mg, FBC, CRP if infection suspected; drug levels only if relevant.
• Neuropsychology: useful in longer-term follow-up for cognitive/behavioural sequelae and rehab planning.

💊 Management (acute, prevention, long-term)

• 1) Acute seizure / suspected status
  • 🛡️ ABCDE, protect airway, check capillary glucose early, treat reversible triggers
  • 💉 First-line: benzodiazepine (per adult status epilepticus pathway)
  • 📞 Escalate early if prolonged/recurrent seizures or reduced consciousness
• 2) Seizure prophylaxis after TBI (high-yield exam point)
  • 🎯 Prophylactic antiseizure meds can reduce early post-traumatic seizures in selected higher-risk TBI
  • ⚠️ They do not reliably prevent development of late PTE - so avoid indefinite prophylaxis without a clear indication
  • 🧾 Drug choice and duration are typically guided by neurosurgery/neurology and local policy (often short course in severe TBI/high-risk lesions)
• 3) Long-term PTE treatment
  • ✅ Treat as epilepsy once recurrent unprovoked seizures (or high recurrence risk) is established
  • 💊 Common first-line options (adult focal epilepsy): levetiracetam or lamotrigine (choice depends on comorbidity, mood, drug interactions, pregnancy potential)
  • 🔁 Regular review: seizure control, adverse effects (mood/irritability with levetiracetam; rash risk with lamotrigine titration), adherence, triggers (sleep deprivation, alcohol)
• 4) Refractory epilepsy / focal lesion
  • 🧠 Consider epilepsy specialist referral for video-EEG, advanced imaging, and surgery work-up if drug-resistant
  • 🧩 Options: resection (if focal), neuromodulation (e.g., VNS) in selected cases
• 5) Rehab + safety
  • 🧑‍🦽 Neuro-rehab for cognitive/physical deficits; address mood/sleep (both worsen seizure control)
  • 🚗 UK: discuss driving restrictions and document advice; safety-net around bathing, heights, swimming, machinery

🧠 Teaching commentary: After TBI, damaged cortex and blood products trigger glutamate-driven hyperexcitability, while healing leaves gliosis and reorganised synaptic networks that can “wire in” an epileptic focus. That’s why seizures in the first week are often reactive to the acute lesion, whereas late seizures reflect a chronic epileptogenic substrate. In practice, your exam answer scores marks by (1) timing the seizure (immediate/early/late), (2) naming high-risk lesions (contusion/ICH/penetrating/depressed fracture), and (3) stating CT acutely + MRI/EEG later, with sensible UK safety-netting including driving advice.