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Seizure recurrence after a first unprovoked seizure in childhood: a prospective study
J Ramos Lizana1, E Cassinello Garciá, L L Carrasco Marina
1Pediatric Neurology Unit, Hospital Torrecárdenas, Almería, Spain. masaco@hto.sas.cica.es
Insights
The risk of seizure recurrence after a first unprovoked seizure in childhood is influenced by factors like etiology. Symptomatic seizures significantly increase recurrence risk, while specific age ranges may decrease it.
Area of Science:
- Pediatric Neurology
- Epileptology
Background:
- Recurrence of seizures after a first unprovoked event is a significant concern in childhood epilepsy.
- Understanding predictors of recurrence is crucial for effective management and prognosis.
Purpose of the Study:
- To investigate the risk of seizure recurrence following a first unprovoked seizure in pediatric patients.
- To identify clinical factors associated with seizure recurrence.
Main Methods:
- Prospective study of 217 children under 14 years with unprovoked seizures.
- Comparison of clinical features and recurrence risk between first-seizure and multiple-seizure groups.
- Kaplan-Meier curves for recurrence risk estimation and Cox proportional hazards models for predictor analysis.
Main Results:
- Recurrence risk was 64% at 5 years for first-seizure patients and 74% for all patients.
- Symptomatic etiology increased recurrence risk, while ages 3-10 years decreased it.
- For symptomatic seizures, 2-year recurrence risk was 96% vs. 46% for idiopathic/cryptogenic seizures.
Conclusions:
- Seizure recurrence risk is dependent on patient selection criteria and etiology.
- Etiology is the most critical factor in predicting recurrence after a first unprovoked seizure.
Purpose:
To study the risk of recurrence after a first unprovoked seizure in childhood.
Methods:
All consecutive patients aged less than 14 years with one or more unprovoked seizures who were attended between January 1, 1987, and June 1, 1996, were included in a prospective study. Clinical features of patients attended after a first seizure and those attended after two or more seizures were compared. Recurrence risk in both groups was estimated by Kaplan-Meier curves. Univariate and multivariate analyses of the potential predictors of recurrence risk were performed for the group of patients attended after a first seizure using the Cox proportional hazards model.
Results:
Included in the study were 217 children. Kaplan-Meier estimate of recurrence risk was 64% at 5 years, when only patients being attended after a first epileptic seizure were included, compared with 74% when all patients were included. Significant differences in several clinical features were found between patients attended after a first seizure and those attended after two or more seizures. Univariate and multivariate analyses showed that in the overall cohort of patients attended after a first seizure, a symptomatic etiology increased the risk of recurrence, whereas a patient age of 3 to 10 years decreased this risk. In particular, the recurrence risk was 96% at 2 years for symptomatic seizures, compared with 46% for idiopathic/cryptogenic seizures. In the group of patients with idiopathic/cryptogenic seizures, an abnormal electroencephalogram and the occurrence of seizures during sleep increased the recurrence risk, whereas a patient aged 3 to 10 years reduced it. In the group of patients with symptomatic etiology, univariate analysis revealed that there was a lower recurrence risk for patients aged 3 to 10 years. This last finding was not maintained, however, in multivariate analysis.
Conclusions:
The recurrence risk depends on the inclusion criteria for enrolling patients. Several factors enable us to predict the recurrence risk after a first unprovoked seizure; the most important of these factors is the etiology of the seizures.
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