NCSE

Question 1

🔍 Definition

Answer 1

• Persistent change in consciousness or behavior from baseline.
  
  • Without prominent motor signs (though subtle motor signs may occur).
  • Associated with epileptiform EEG activity.
  • Time threshold not clearly defined, but:
    
    • Often considered >10 minutes
    • Or shorter periods without full recovery.

Question 2

📊 Incidence
&
🔍 Subtypes

Answer 2

• Seen in ~50% of comatose patients with convulsive SE.
• Occurs in:
  
  • 10–35% of general ICU patients
  • 10–30% of patients post-cardiac arrest
  • 10–35% of TBI patients in ICU

⸻

*	Primary generalized NCSE
*	Secondary generalized NCSE

Question 3

⚠️ Risk Factors for NCSE

Answer 3

I* Sepsis (esp. in patients with pre-existing seizure disorder)

II*	Severe traumatic brain injury (TBI)

III*	Subarachnoid hemorrhage (SAH) / intracerebral hemorrhage

IV*	Ischemic stroke

V*	Encephalitis

VI*	Post-cardiac arrest

VII*	Dementia (particularly advanced-stage)

VIII*	Drug withdrawal (e.g. benzodiazepines, antiepileptics)

IX*	Excessive use of psychotropic medications

Question 4

🔍 Diagnosis – When to Suspect NCSE- give 3 scenarios

Answer 4

I* Postictal confusion lasting >20 minutes after a GTCS
- NCSE complicates ~10–40% of convulsive SE
II* Persistent altered sensorium:
- Especially when not explained by imaging or labs
III* Fluctuating GCS in a patient with seizure risk
IV* Unexplained delirium or encephalopathy (especially in elderly)
V* Paradoxical improvement after:
- AED administration
- Benzodiazepines or propofol trial

Question 5

🧠 6 Clinical Features of NCSE

Answer 5

🧠 Clinical Features:

1*	Altered sensorium (unexplained)

2*	Behavioral changes, such as:
 -	Delusions, hallucinations

3*	Subtle motor signs:
*	Eye deviation
*	Nystagmus
*	Myoclonus

4*	Autonomic dysregulation

5*	Catatonia-like features

6*	Speech disturbances

No prominent convulsive activity
* Often underdiagnosed due to subtlety.
* Requires EEG monitoring to confirm.

Question 6

🧪 Investigations

Answer 6

🧪 Investigations
I. Routine labs:
* CBC, CRP (sepsis screen)
* Electrolytes: Na, K, Ca, Mg, glucose
* LFTs, RFTs (hepatic/renal dysfunction)
* Coagulation panel, TTP screen
* Urine toxicology
* Infection workup:
- Blood cultures

2. • Lumbar puncture if CNS infection/inflammation suspected
   3.* Drug levels (e.g., AEDs)

⸻

4. 🧠 EEG Evaluation
   
   • Assess response to antiepileptic treatment.
   • Continuous EEG monitoring is essential:
   • Up to 50% of NCSE cases missed without it (especially in ICU).

⸻

5. 🧲 Neuroimaging
   
   • CT/MRI: rule out structural cause
   • MRI preferred if CT is unrevealing

Question 7

⚡ EEG Features Suggestive of NCSE

Answer 7

1* Periodic epileptiform discharges

2*	Rhythmic discharges + clinical signs (e.g., altered awareness)

3*	Rhythmic discharge ± clinical signs but with EEG response to AEDs

Question 8

⚠️ Challenges in Diagnosis

Answer 8

⚠️ Challenges in Diagnosis
I. Requires high clinical suspicion- no obvious clinical signs-delayed diagnosis

II.	Lack of consensus: * 	*	Clinical definitions *   *	Diagnostic criteria * 	*	EEG thresholds * 	*	Management

III. Difficulty predicting if EEG findings reflect persistent seizure activity vs. postictal or non-ictal phenomena.

IV. Low GCS may result from:
* * Postictal state
* * Metabolic or septic encephalopathy
* * Sedative drug effects
* * NCSE itself

V. Limited availability of continuous EEG monitoring in many centers.

VI.	EEG findings are not 100% specific
  -	Can occur in other conditions like epilepsy or encephalitis.

VII. Treatment strategies are poorly defined

Question 9

🔍 Differential Diagnosis for NCSE

Answer 9

• Metabolic encephalopathy
• Septic encephalopathy
• Hypertensive encephalopathy
• PRES
• Prolonged postictal state
• Autoimmune encephalitis
• Complex migraine
• TIA/ Stroke
• Drug/substance intoxication, e.g.:
  
  • Lithium
  • Baclofen
  • TCAs
  • Gabapentin
  • Drug withdrawal, e.g.:
  • Alcohol
  • Benzodiazepines

Question 10

🧠 Management Priorities in NCSE

Answer 10

🧠 Management Priorities in NCSE

⸻

🟢 Early Diagnosis & Treatment
* Paramount to preserve neurologic and systemic function.
* Delay increases risk of permanent sequelae.

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🛑 Immediate Threats to Address
* Secure airway as needed.
* Correct:
* Hypoglycemia
* Hyperthermia

⸻

🔍 Investigate & Treat Underlying Cause
* Reversible triggers:
* Missed AED doses
* Drug withdrawal
* Infection/sepsis
* Check and correct:
* Glucose, sodium, calcium, magnesium
* Optimize AED regimen in known epileptics

Question 11

Tt of seizures

Answer 11

->Ist line- Benzodiazepines

->2nd line- Valproate/Levetiracetam/Phenytoin

• If no response to initial therapy, escalate quickly:
  -> 3rd line: Anesthetic agents (requires intubation)
• Midazolam infusion
• Propofol infusion

->4th line:
* Barbiturates
* Ketamine (may be used in refractory cases)

Question 11

Mx cont

Answer 11

🧠 EEG Monitoring
* Used to:
- Detect & diagnose NCSE
- Monitor response to treatment

⸻

⚠️ Sedation Weaning Practice
* Continue anesthetic agents for 24–48 hrs
* Allow a period of seizure-free EEG before tapering

⸻

🧠 Neurology Consult
* Should be obtained early in refractory or unclear cases

Question 12

🚨 Complication Management

Answer 12

• Seek and treat complications:
  
  • Aspiration
  • Respiratory issues
  • Hypotension
  • Provide supportive management throughout