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Outcome after prolonged convulsive seizures in 186 children: low morbidity, no mortality

Piia Metsäranta1, Matti Koivikko, Jukka Peltola

  • 1Medical School, University of Tampere, Tampere University Hospital, Tampere, Finland.

Developmental Medicine and Child Neurology
|February 21, 2004
PubMed

Insights

Neurological sequelae from prolonged convulsive seizures in children are uncommon. Aetiology, not seizure length, is the primary factor influencing outcomes in pediatric epilepsy.

Area of Science:

  • Pediatric Neurology
  • Epileptology
  • Clinical Neuroscience

Background:

  • Prolonged convulsive seizures represent a significant neurological emergency in children.
  • These seizures pose a risk for neuronal damage and long-term functional deficits.

Purpose of the Study:

  • To investigate the relationship between seizure duration and background factors contributing to neurological sequelae in children experiencing prolonged convulsive seizures.
  • To determine the incidence and nature of neurological sequelae following these events.

Main Methods:

  • Retrospective analysis of medical records for children under 16 admitted with seizures >5 minutes at Tampere University Hospital (1993-1999).
  • Individual patient follow-up data (mean 2 years 1 month) were meticulously reviewed.
  • Seizure characteristics, aetiology, and neurological outcomes were systematically analyzed.

Main Results:

  • 186 children experienced 279 prolonged seizure episodes; annual incidence was 47.5/100,000.
  • Seizure aetiology varied: idiopathic (26.2%), febrile (41.9%), remote symptomatic (28%), and acute symptomatic (3.9%).
  • Mean seizure duration was 42.5 minutes, significantly longer in acute symptomatic cases (88.6 min). Permanent neurological sequelae occurred in 2.2% (mean duration 16 min), non-permanent in 3.2% (mean duration 38 min). Epilepsy onset was the most common sequela (22%).

Conclusions:

  • Neurological sequelae following prolonged convulsive seizures in children are rare.
  • Aetiological factors are more strongly associated with sequelae than seizure duration.
  • The precise role of acute seizures in pediatric epilepsy development requires further investigation.

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