Febrile Seizures

Febrile Seizures: Basics - Fever's Jittery Intro

• Definition: Seizure with fever ($T \ge \textbf{38}^\circ C$) in children aged 3 months to 6 years, without CNS infection, metabolic disturbance, or prior afebrile seizures.

• Epidemiology:

  • Peak age: 6 months - 5 years.
  • Incidence: 2-5% of children.

  ⭐ Most common seizure disorder in childhood, affecting 2-5% of children.

• Types: Classified based on clinical presentation.

  Feature	Simple Febrile Seizure (SFS)	Complex Febrile Seizure (CFS)
  Duration	<15 minutes (typically brief)	$\ge$15 minutes (can be serial)
  Semiology	Generalized (usually tonic-clonic)	Focal onset or features during seizure
  Recurrence (24h)	One seizure per febrile illness	>1 seizure within 24 hours / same illness
  Postictal	Rapid recovery, non-focal	May have transient focal deficit (Todd's)

Febrile Seizures: Etiopathogenesis & Features - Hot Brain Shakes

• Etiology:
  • Viral infections (common): HHV-6, Influenza.
  • Post-vaccination (rare): DTP, MMR.
• Pathophysiology:
  • Fever (>38°C) acts as a trigger.
  • Cytokine release (e.g., IL-1β).
  • Immature neuronal networks & genetic susceptibility.
• Clinical Features:
  • Simple (SFS): Generalized, duration <15 min, single episode/24h, no postictal focality.

    ⭐ Simple febrile seizures are generalized, last <15 minutes, occur once in 24 hours, and have no focal features; they do not cause brain damage.

  • Complex (CFS): Meets ≥1 of: 📌 Focal (features during seizure or postictal deficit like Todd's paresis), Long (duration >15 min), Recurrent (≥2 episodes in 24h or same illness).

Febrile Seizures: Diagnosis & DDx - Seizure Sleuthing

• Diagnosis: Clinical, history (fever + seizure). Exclude CNS infection.
• Key Investigations:
  • Lumbar Puncture (LP):
    • Strongly consider: age <12 months.
    • Indicated: signs of meningitis/intracranial infection.
    • Consider if on antibiotics (masks meningitis).

-   **EEG**: Not routine for simple FS; consider for complex/atypical.
-   **Neuroimaging (CT/MRI)**: Not routine; consider for focal deficit, ↑ICP signs.

• Differential Diagnosis (DDx):
  • Meningitis/Encephalitis.
  • Epilepsy triggered by fever.
  • Electrolyte imbalance (hypoglycemia).
  • Toxic ingestion.

⭐ According to AAP guidelines, LP is strongly considered for infants aged 6-12 months with a first simple febrile seizure if immunization status for Hib or S. pneumoniae is deficient or undetermined.

Febrile Seizures: Management & Prognosis - Cool Down Care

• Acute Management:
  • ABCs, recovery position.
  • Antipyretics (paracetamol/ibuprofen) for comfort.
  • Seizure >5 min: Rescue Benzodiazepines (Rectal Diazepam $0.5 \text{ mg/kg}$, IN/Buccal Midazolam $0.2 \text{ mg/kg}$).
• Parental Counseling & Education:
  • Reassurance, fever control for comfort (not prevention), seizure first aid.
  • Low risk of epilepsy.
• Prophylaxis: Generally not recommended (side effects vs. benign nature).
• Prognosis:
  • Recurrence risk: ~30%.
    • Risk factors: Young age at first FS (<18 months), family history of FS, fever <39°C, short fever-seizure interval. 📌
  • Epilepsy risk: Simple FS ~1-2%; higher for complex FS or other risks.

⭐ Antipyretics (paracetamol, ibuprofen) are used for child's comfort during fever but do not prevent the recurrence of febrile seizures.

High‑Yield Points - ⚡ Biggest Takeaways

• Age: Common between 6 months to 5 years, triggered by fever (often >38°C).
• Simple FS: Generalized, <15 min, single episode/24h, quick recovery.
• Complex FS: Focal, >15 min, multiple episodes/24h, or postictal deficit.
• Acute Care: Antipyretics; diazepam (rectal/IV) if seizure >5 min.
• Prognosis: Generally excellent; low risk of future epilepsy.
• EEG: Not routine for first simple febrile seizure.
• LP: Consider in infants <12 months, or if meningitis suspected_._