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Age at onset of seizures in young children
Insights
Early childhood seizures, particularly in the first year, are common. However, the age of seizure onset has limited predictive value for long-term neurological outcomes like cerebral palsy or intellectual function.
Area of Science:
- Pediatric Neurology
- Developmental Pediatrics
- Epileptology
Background:
- Seizures in early childhood are a significant concern for parents and clinicians.
- Understanding the relationship between seizure onset, neurological status, and long-term outcomes is crucial for early intervention and management.
- Previous studies have explored risk factors, but comprehensive data on early-onset seizures and their prognostic value is still developing.
Purpose of the Study:
- To examine the age at onset of seizures in young children.
- To investigate the relationship between early seizure onset and prior neurological status.
- To determine the prognostic value of early seizure onset for neurological outcomes at age 7.
Main Methods:
- A large cohort study followed 52,360 children from birth to 7 years of age.
- Data collection included seizure occurrence, neurological status, and developmental assessments.
- Statistical analysis was used to determine incidence, associations, and prognostic value.
Main Results:
- The incidence of nonfebrile convulsions was highest in the first year of life, especially the first month.
- Children with neonatal seizures who later had nonfebrile seizures typically experienced them within the first year.
- Neurological abnormality before seizure onset or the presence of minor motor seizures correlated with increased rates of mental retardation and cerebral palsy at age 7.
- Early age at seizure onset showed little prognostic value for intellectual function, cerebral palsy, or epilepsy at age 7.
Conclusions:
- While seizures are most common in the first year of life, the specific age of onset has limited predictive power for long-term neurological outcomes.
- Pre-existing neurological abnormalities and specific seizure types (minor motor) are more significant predictors of adverse outcomes.
- Further research may focus on identifying specific seizure characteristics and early neurological signs that hold greater prognostic value.
Abstract:
Age at onset of seizures in young children and its relationship to factors such as prior neurological status and neurological outcome were examined. Of 52,360 children, 39,270 of whom were followed for the full 7 years, a total of 2,635 experienced one or more seizures between birth and 7 years of age. The incidence of nonfebrile convulsions was highest in the first year of life, especially in the first month. Children with neonatal seizures who later developed nonfebrile seizures did so early, two-thirds by 6 months and three-quarters by 1 year of age. Children with neurological or developmental abnormality assessed in the first year of life did not have their first seizure earlier than children without abnormality. Neurological abnormality in the first year of life before any seizure, and the presence of minor motor seizures, were associated with an increased rate of mental retardation and cerebral palsy at age 7, but early age at onset appeared to have little prognostic value regarding intellectual function, cerebral palsy, and epilepsy.