Introduction: Febrile convulsions are the most frequent type of seizures in children under 6 years old. They usually have a good prognosis. Only a few of these children will later suffer from non-febrile seizures. The low risk of non-febrile seizures and important side-effects of antiepileptic drugs have limited the use of continuous prophylaxis in children with recurrent febrile seizures.
Objectives: Our aim has been to identify the main factors that imply a higher risk for recurrent febrile convulsions and also to identify the frequency of antiepileptic prophylactic medication in our area.
Material and methods: We have carried out a protocoled study in children which were sent consecutively and with no previous selection to a reference electroencephalography (EEG) outpatient unit in Murcia with the clinical diagnosis of febrile convulsions. Data included have been: sex, actual age and age at the time of the first seizure, total number of seizures, family and personal history of either febrile seizures or epilepsy, EEG findings, treatment and side-effects. Data collection was accomplished between September 1991 and June 1993. A total of 509 patients have been included.
Results: A 34% of the children had suffered two or more seizures. Children with recurrent seizures were younger at onset (16.7 vs 21 months) and had more often family history of febrile seizures (40.6% vs 28%) and epilepsy (21.5% vs 12.5%). 60% of the children who had family history of febrile seizures of epilepsy and who suffered the first episode before the age of 16 months had recurrent febrile convulsions.
Conclusions: An age under 16 months at the moment of the first convulsion and the existence of family history of febrile seizures or epilepsy increase the risk of recurrent febrile seizures.