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Febrile seizures: is the EEG a useful predictor of recurrences?
M Kuturec1, S E Emoto, N Sofijanov
1National Institute of Neurological Disorders and Stroke (NINDS), Bethesda, Maryland 20892-9020, USA.
Insights
In children with febrile seizures, an abnormal electroencephalogram (EEG) did not predict recurrence. Younger age was the primary factor influencing the risk of recurrent febrile seizures.
Area of Science:
- Pediatrics
- Neurology
- Clinical Neurophysiology
Background:
- Febrile seizures are common in childhood.
- Predicting recurrence is crucial for clinical management.
- The role of electroencephalogram (EEG) in predicting febrile seizure recurrence requires further clarification.
Purpose of the Study:
- To evaluate the predictive value of paroxysmal electroencephalogram (EEG) findings in children experiencing febrile seizures.
- To determine if EEG abnormalities correlate with an increased risk of febrile seizure recurrence.
Main Methods:
- Retrospective analysis of 1982-1984 data from a single pediatric clinic in Macedonia.
- Classification of EEG results into normal, epileptiform, and nonspecifically abnormal categories.
- Comparison of febrile seizure recurrence rates between children with normal EEGs and those with paroxysmal EEGs.
- Mean follow-up period of approximately 23 months.
Main Results:
- No significant difference in the risk of febrile seizure recurrence was observed between children with normal EEGs and those with paroxysmal EEGs.
- Younger age was identified as the primary predictor for increased risk of febrile seizure recurrence.
- EEG findings did not provide additional predictive information on recurrence likelihood.
Conclusions:
- Paroxysmal EEG findings do not significantly predict the recurrence of febrile seizures in children.
- Age at the time of the initial febrile seizure is a more critical factor in determining recurrence risk.
- Routine EEG may not be necessary for predicting febrile seizure recurrence in all cases.
Abstract:
We examined the predictive value of a paroxysmal EEG in children with febrile seizures seen at the University Pediatric Clinic, Skopje, Macedonia, between 1982 and 1984. This was the only facility providing EEG or neurologic consultation for children in Macedonia, and almost all children in the area who experienced a febrile seizure were referred to this facility. EEGs were classified as epileptiform if they contained spikes and sharp waves or spike wave complexes, which were either focal or generalized, and were considered abnormal for age and state. Nonspecifically abnormal was defined as focal or generalized slowing excessive for age and state. Follow-up visits were scheduled at 6-month intervals; mean follow-up time was approximately 23 months. In order to determine whether clearly abnormal EEG features would predict recurrences, we compared the recurrences in 170 children with initial normal-appearing EEGs with 99 children with initial paroxysmal EEGs. There was no significant difference in risk of recurrence of febrile seizures between the two groups; increase in recurrence risk was determined primarily by younger age. The EEG did not add information regarding the likelihood of recurrence of febrile seizures.