Febrile seizures causes complications symptoms in breif
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Febrile Seizures - Brief Overview
Definition
A febrile seizure is a seizure occurring in children aged 6 months to 6 years with a fever ≥38°C (100.4°F), in the absence of a CNS infection, known seizure-provoking cause (e.g., electrolyte imbalance, hypoglycemia), or prior history of afebrile seizures. It is the most common seizure disorder of childhood, affecting 2-5% of children.
Types
| Feature | Simple | Complex |
|---|---|---|
| Duration | <15 minutes | >15 minutes |
| Seizure type | Generalized tonic-clonic | May be focal |
| Frequency in 24h | Only once | >1 seizure in 24h |
| Age | 6 months - 6 years | <6 months or >6 years |
Febrile status epilepticus - seizure lasting >30 minutes; rare but most serious subtype.
Causes / Triggers
The fever itself (not a specific illness) provokes the seizure. Common causes of the triggering fever include:
- Viral infections - most common overall (HHV-6/roseola is a classic trigger; also influenza, RSV, parainfluenza)
- Otitis media
- Upper respiratory tract infections
- Gastroenteritis
- Post-vaccination fever (e.g., MMR, DTaP) - the vaccine-induced fever triggers the seizure, not the vaccine antigen itself
- Urinary tract infections
- Bacterial infections (less common, but meningitis must always be excluded)
Predisposing factors:
- Family history of febrile seizures or epilepsy (first-degree relatives)
- Age <1 year at first seizure
- Daycare attendance (increased infectious exposure)
- Pre-existing neurodevelopmental abnormalities
Symptoms / Clinical Features
During the seizure:
- Sudden loss of consciousness
- Generalized tonic-clonic convulsions (stiffening followed by rhythmic jerking)
- Eyes rolling back or deviation
- Breath holding / cyanosis
- Urinary/fecal incontinence (occasionally)
- Duration typically <5 minutes
After the seizure (postictal phase):
- Drowsiness and confusion (postictal state)
- Todd's paralysis (transient focal weakness) - more common after complex seizures
- Child returns to baseline within 1 hour in simple febrile seizures
Warning signs requiring emergency evaluation:
- Seizure lasting >5 minutes (give rescue benzodiazepine)
- Focal neurological features
- Failure to return to baseline
- Signs of meningitis (neck stiffness, photophobia, petechiae)
- Age <6 months
Complications
Most febrile seizures are benign. However, complications can include:
| Complication | Detail |
|---|---|
| Recurrence | 30-40% have at least one recurrence; risk highest if age <1 year, family history, daycare attendance |
| Epilepsy development | Risk ~7% by age 25 (vs. ~1% baseline in general population) |
| Hippocampal injury | Febrile status epilepticus can cause hippocampal T2 signal changes on MRI in ~11.5% of cases; may progress to hippocampal sclerosis |
| Temporal lobe epilepsy | Long-term association with mesial temporal sclerosis; link not fully proven |
| Psychological impact | Significant parental anxiety; generally no cognitive or behavioral sequelae in simple febrile seizures |
| Injury during seizure | Falls, aspiration (rare) |
Risk factors for later epilepsy:
- One complex feature: 6-8% risk
- Two complex features: 17-22% risk
- All three complex features: up to 49% risk
- Pre-existing neurodevelopmental delay + family history of epilepsy also elevate risk
Key Point
Simple febrile seizures carry an excellent prognosis. No anticonvulsants, EEG, neuroimaging, or routine blood work is required. Evaluation focuses on identifying the fever source. Lumbar puncture should be considered if meningitis signs are present or child is <12 months and unimmunized.
- Bradley and Daroff's Neurology in Clinical Practice, p. 2255
- Tintinalli's Emergency Medicine, p. 936
- Rosen's Emergency Medicine, p. 3287
Management
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Management of Febrile Seizures
1. Immediate / Acute Management (During the Seizure)
First priorities - ABC:
- Place child in lateral (recovery) position to prevent aspiration
- Protect from injury; do not restrain
- Airway - keep patent; high-flow oxygen if cyanosis present
- Time the seizure from onset
If seizure lasts >5 minutes (or at home if >5 min):
- Rectal diazepam 0.5 mg/kg (most widely used rescue agent)
- Buccal midazolam 0.4-0.5 mg/kg (equally effective, more practical at home)
- Intranasal midazolam 0.2 mg/kg (also effective)
If seizure continues (status epilepticus = >30 min or refractory):
- IV/IO lorazepam 0.1 mg/kg (first-line in hospital)
- Alternatively IV phenytoin / fosphenytoin or IV phenobarbital
- Manage as per convulsive status epilepticus protocol
2. Post-Ictal Management
- Supportive care - reassurance, monitor
- Administer antipyretics (paracetamol/ibuprofen) to reduce fever and discomfort
- Note: antipyretics do NOT prevent recurrence of febrile seizures
- Frequent neurological monitoring to assess mental status
- Child typically returns to baseline within 1 hour
3. Investigations (Targeted, Not Routine)
Simple febrile seizure - minimal workup:
| Investigation | Recommendation |
|---|---|
| Blood tests (CBC, electrolytes, glucose) | Only if clinically indicated (vomiting, diarrhea, dehydration) |
| Lumbar puncture (LP) | Strongly consider if signs/symptoms of meningitis; consider in child <12 months unimmunized for HIB or Strep pneumoniae; consider if pretreated with antibiotics |
| EEG | NOT routinely indicated |
| Neuroimaging (CT/MRI) | NOT routinely indicated |
| Urinalysis/culture | Indicated to find fever source |
Complex febrile seizure / febrile status epilepticus:
- LP should be performed (meningitis risk is higher)
- Consider CBC, BMP, glucose, cultures
- Neurology consult
- Imaging and EEG may be considered (can be outpatient if stable)
4. Admission vs. Discharge
Discharge home if:
- Child has returned to baseline
- Fever source does not require inpatient treatment
- Child appears non-toxic
- Parent education provided
- PCP follow-up arranged
Admit / observe if:
- Unstable clinical status
- Serious bacterial infection requiring IV treatment
- Febrile status epilepticus
- Parental anxiety with unsafe home situation
- Pending neuroimaging or EEG that cannot be done outpatient
5. Prophylaxis - Long-Term
Chronic anticonvulsant prophylaxis is NOT recommended for most children because:
- Side effects (especially phenobarbital - causes cognitive/behavioral issues) outweigh minimal benefit
- Does NOT reduce the long-term risk of developing epilepsy
- Simple febrile seizures have an excellent prognosis regardless
Intermittent prophylaxis (at time of fever) may be considered in selected high-risk cases:
- Oral or rectal diazepam every 8 hours during febrile illness - drug of choice when prophylaxis is used
- ILAE suggests considering this in children with ≥3 episodes in 6 months or ≥4 per year
- Reserved for children with multiple risk factors and significant parental anxiety
Drugs that were tried but are NOT recommended:
- Phenobarbital (chronic) - impairs cognition
- Valproate (chronic) - hepatotoxicity risk in young children
- Antipyretics alone - no evidence they prevent seizure recurrence
6. Parent Education (Key Points to Cover)
- Febrile seizures are common and generally benign
- Recurrence risk: ~30% if first seizure >12 months; ~50% if first seizure <12 months
- 98% of children have no further seizures after age 5
- Only a small increased risk of epilepsy (1-2%, vs. 0.5-1% in general population)
- No cognitive or intellectual impairment from simple febrile seizures
- Teach parents rescue medication use (rectal/buccal diazepam or buccal midazolam)
- When to call emergency services: seizure >5 minutes, child not waking up, signs of meningitis, first seizure in a child <6 months
Summary Table
| Scenario | Management |
|---|---|
| Seizure still ongoing >5 min | Rectal diazepam / buccal midazolam |
| Status epilepticus | IV lorazepam → IV phenytoin/phenobarbital |
| Simple febrile seizure, recovered | Supportive care, find fever source, discharge |
| Complex febrile seizure | Consider LP, neurology consult, observe |
| Febrile status epilepticus | LP mandatory, admit, manage as SE |
| Recurrent high-risk child | Intermittent diazepam prophylaxis |
| Chronic prophylaxis | Not recommended routinely |
- Goodman & Gilman's Pharmacological Basis of Therapeutics, p. Febrile Convulsions
- Rosen's Emergency Medicine, p. 3158-3159
- Tintinalli's Emergency Medicine, p. 935-936
- Swanson's Family Medicine Review, p. 313
- AAP guidelines via Medscape
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