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Risk factors for subsequent febrile seizures in the FEBSTAT study.

Dale C Hesdorffer1, Shlomo Shinnar2, Daniel N Lax2

  • 1Department of Epidemiology and GH Sergievsky Center, Columbia University, New York, New York, U.S.A.

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Summary

Children with prolonged febrile status epilepticus (FSE) have a higher risk of recurrent FSE. Brain MRI abnormalities increase this risk, highlighting the need for better parent and clinician education on rescue medication use.

Keywords:
Febrile seizure recurrenceSimple febrile seizureStatus epilepticus

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Area of Science:

  • Pediatric Neurology
  • Epileptology
  • Clinical Pediatrics

Background:

  • Febrile seizures (FS) are common in children, with febrile status epilepticus (FSE) representing a prolonged subtype.
  • Understanding risk factors for recurrent seizures is crucial for effective management and prevention.

Purpose of the Study:

  • To compare the risk of subsequent febrile seizures (FS) in children with a first febrile status epilepticus (FSE) versus a first simple febrile seizure (SFS).
  • To identify risk factors for subsequent FS, including baseline MRI abnormalities.
  • To assess the home use of rescue medications for subsequent FS.

Main Methods:

  • Retrospective cohort study comparing FSE cases (FEBSTAT and Columbia cohorts) with SFS controls.
  • Cumulative risk for subsequent FS over 5 years was analyzed using Cox proportional hazards regression.
  • Analysis of subsequent FS within the FSE group and assessment of home rescue medication use.

Main Results:

  • Children with a first FSE had a significantly increased risk of subsequent FSE compared to SFS.
  • Any baseline MRI abnormality increased the risk of subsequent FSE by 3.4-fold.
  • The risk for any subsequent FS or prolonged FS (>10 min) did not differ between FSE and SFS groups over 5 years.
  • Only 23.8% of children with subsequent prolonged FS received home rectal diazepam.

Conclusions:

  • FSE is associated with an increased risk of recurrent FSE, indicating a propensity for prolonged seizure recurrence.
  • Baseline MRI abnormalities are a significant risk factor for FSE recurrence.
  • Underutilization of prescribed home rescue medications for prolonged FS suggests a need for improved clinician and parent education.