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Q1. Status Epilepticus (SE) in Children - Etio-pathogenesis, Clinical Approach & Management

Definition

• A single seizure lasting >5 minutes, OR
• Two or more seizures without recovery of consciousness between them

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Etio-pathogenesis

Etiology (Age-dependent)

Pathogenesis

1. Initiation: Failure of normal seizure-terminating mechanisms (loss of GABA-mediated inhibition, excessive glutamate excitation)
2. Self-sustaining SE: As SE continues beyond 5-10 min, GABA-A receptors internalize (are removed from the synapse) - this is why SE becomes progressively harder to treat the longer it goes on
3. Neuronal injury: Sustained excessive neuronal firing leads to excitotoxic injury via calcium influx, mitochondrial dysfunction, and free radical generation
4. Systemic consequences: Hyperthermia, lactic acidosis, hypoglycemia, hypoxia, aspiration - all worsen brain injury

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Clinical Approach

Phases of SE to Recognize:

Clinical Assessment - "AEIOU-TIPS" for cause:

• A - Alcohol/Abuse
• E - Epilepsy/Electrolytes
• I - Infection (meningitis, encephalitis)
• O - Overdose/drugs
• U - Uremia/metabolic
• T - Trauma
• I - Insulin (hypoglycemia)
• P - Psychiatric/psychogenic
• S - Stroke/structural

Investigations (to be done simultaneously with treatment):

• Blood glucose (stat - fingerstick)
• Electrolytes: Na, K, Ca, Mg, phosphate
• CBC, RFT, LFT
• AED drug levels (if on medication)
• Blood and urine culture (if febrile)
• CSF - if meningitis suspected (only after seizure control and ruling out raised ICP)
• EEG - to detect nonconvulsive SE, confirm diagnosis, guide therapy
• Neuroimaging (MRI/CT) - once stabilized, to identify structural cause

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Management

Step 1: Stabilization (0-5 minutes) - "ABC"

• Airway: Position lateral (recovery), suction secretions, nasopharyngeal airway if needed
• Breathing: O2 by mask/nasal cannula; bag-valve-mask if ventilation inadequate
• Circulation: IV/IO access, cardiac monitoring, pulse oximetry
• Check glucose: If hypoglycemic → 2 mL/kg of 25% dextrose IV
• Do NOT restrain forcefully; protect from injury

Step 2: First-line therapy - Benzodiazepines (0-10 min)

• If IV not available: buccal/intranasal/IM midazolam preferred over rectal diazepam
• A second dose may be given after 5 minutes if seizure continues
• Side effects: respiratory depression, hypotension

Step 3: Second-line therapy (10-30 min) - if benzodiazepines fail

Step 4: Refractory SE (30-60 min) - ICU admission

• Midazolam infusion: 0.1-2 mg/kg/hr
• Propofol: 1-5 mg/kg/hr (avoid in young children - propofol infusion syndrome)
• Thiopentone/Phenobarbitone infusion
• Consider ketamine for refractory SE (NMDA receptor antagonist)
• Intubation + mechanical ventilation typically required

Treat the Underlying Cause

• Antibiotics if meningitis/encephalitis suspected (do not delay for LP)
• Pyridoxine 50-100 mg IV if pyridoxine-dependent seizures possible (infants)
• Correct electrolyte abnormalities

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Q2. Unconscious Child - Etio-pathogenesis, Clinical Approach & Management

Definition

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Etio-pathogenesis

Anatomy of Consciousness

1. Ascending Reticular Activating System (ARAS) in the brainstem - the "arousal" component
2. Bilateral cerebral cortex - the "awareness" component

Causes - Mnemonic "AEIOU-TIPS" or "VITAMINS"

Pathogenesis

• Any cause that disrupts ARAS function, causes bilateral cortical depression, or raises ICP sufficiently to compress brainstem leads to coma
• Final common pathway: impaired cerebral oxygenation/metabolism → neuronal dysfunction

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Clinical Approach

Initial "ABCDE" Assessment

• A - Airway: patent? Signs of obstruction?
• B - Breathing: rate, effort, SpO2
• C - Circulation: HR, BP, perfusion, capillary refill
• D - Disability: Neurological status (GCS, pupils)
• E - Exposure: rash, injury, temperature

Level of Consciousness Assessment

AVPU Scale (quick bedside):

• A - Alert
• V - Responds to Voice
• P - Responds to Pain
• U - Unresponsive

Neurological Examination:

1. Pupils: Size, symmetry, reactivity
   • Small reactive: metabolic, opiates, pontine lesion
   • Fixed dilated unilateral: uncal herniation (3rd nerve compression)
   • Fixed dilated bilateral: terminal herniation, atropine, severe anoxia
2. Eye movements: Doll's eye reflex, nystagmus
3. Motor posturing:
   • Decorticate (flexion arms, extension legs): lesion above midbrain
   • Decerebrate (extension all limbs): midbrain/pontine lesion - worse prognosis
4. Breathing pattern: Cheyne-Stokes, central hyperventilation, apneustic breathing
5. Fundoscopy: Papilledema (raised ICP), retinal hemorrhages (NAI)
6. Look for: Meningism (neck stiffness, Kernig's, Brudzinski's), rash (petechiae → meningococcemia), jaundice, hepatomegaly, head injury marks

Key Investigations:

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Management

Immediate Life-Saving Measures

1. Airway: Jaw thrust; if GCS ≤8 → intubate to protect airway
2. Breathing: 100% O2; mechanical ventilation if needed
3. Circulation: IV/IO access; treat shock with 10-20 mL/kg NS bolus
4. Glucose: Check immediately; if low → 2 mL/kg 10-25% dextrose IV
5. Treat hyperthermia: Paracetamol + tepid sponging

If Raised ICP Suspected:

• Head elevation 30°, midline position
• Mannitol 0.5-1 g/kg IV over 15-20 min (osmotic diuresis)
• Hypertonic saline (3% NaCl) - 3-5 mL/kg
• Hyperventilation (PaCO2 35-40 mmHg) - temporary measure
• Avoid hypo-osmolar fluids, hyperthermia, hypoxia

Empirical Treatment While Awaiting Results:

• If meningitis/encephalitis suspected: Ceftriaxone 100 mg/kg/day + Acyclovir 10-15 mg/kg/dose TID (for HSV encephalitis)
• If poisoning: Specific antidote where available (naloxone for opioids, atropine for organophosphates)
• If hypoglycemia: Correct as above
• If seizure: Treat per SE protocol above

Ongoing Monitoring (ICU):

• Continuous cardiac, respiratory monitoring
• Strict fluid balance (avoid fluid overload with cerebral edema)
• Nasogastric tube - nutritional support; avoid aspiration
• Urinary catheter
• Prevention of pressure sores, corneal injury, DVT
• Temperature management (normothermia)

Prognosis Indicators:

• Etiology is the most important predictor
• GCS at presentation, pupillary response, motor posturing
• Reversible metabolic causes have better prognosis than structural or anoxic-ischemic injury

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Summary Table