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Prognostic factors of convulsive disorders in the first year of life
Insights
Early neurodevelopmental status, seizure characteristics, and EEG findings significantly impact long-term outcomes for infants with convulsive disorders, influencing seizure control and development.
Area of Science:
- Pediatric Neurology
- Developmental Neuroscience
- Epileptology
Background:
- Infantile convulsive disorders present complex challenges for predicting long-term neurodevelopmental outcomes and seizure control.
- Identifying reliable prognostic factors is crucial for early intervention and management strategies.
Purpose of the Study:
- To investigate prognostic factors for mental and physical development and seizure control in infants with convulsive disorders.
- To analyze the influence of pre-existing neurodevelopmental status, seizure characteristics, etiology, and EEG findings on patient outcomes.
Main Methods:
- A cohort of 194 patients with convulsive disorders (excluding infantile spasms, neonatal, and occasional convulsions) was studied, including 33 with febrile convulsions.
- Patients were followed up to age six or older and categorized into five etiologic groups: prenatal, perinatal, postnatal, doubtful, and cryptogenic.
- Prognostic indicators assessed included pre-seizure development, neurological abnormalities, seizure semiology, etiology, and initial electroencephalogram (EEG) findings.
Main Results:
- Delayed development or neurological abnormalities before seizure onset were associated with poorer seizure control and developmental outcomes.
- Patients experiencing brief, symmetric, generalized tonic and/or clonic convulsions, particularly cryptogenic cases, showed a better prognosis.
- Normal initial EEG findings strongly correlated with a favorable long-term prognosis for both seizure control and neurodevelopment.
Conclusions:
- Pre-seizure neurodevelopmental status, clinical seizure features, and infantile EEG findings are critical prognostic indicators for children with convulsive disorders.
- Etiology remains an important factor, but clinical and electrophysiological data provide significant predictive value for long-term outcomes.
- These findings underscore the importance of comprehensive early assessment for optimizing management and support for affected infants.
Abstract:
Prognostic factors for mental and physical development and seizure control were investigated in 194 patients with convulsive disorders in the first year of life, excluding infantile spasms, neonatal convulsions and occasional convulsions. Thirty-three patients with febrile convulsions were included in the study. All patients were followed up to age six or older. The cases were subdivided into five etiologic groups; prenatal, perinatal, postnatal, doubtful and cryptogenic. Those with delayed development before the onset of seizures, or neurological abnormalities at the first visit had significantly less chance of being seizure-free and attaining normal mental and physical development. The prognosis for seizures and mental and physical development was much better in the patients with brief, symmetric, generalized tonic and/or clonic convulsions. This was also true with cryptogenic cases. There was a significant correlation between the initial EEGs and the long-term prognosis for mental and physical development and seizure control. Normal EEG was associated with a good prognosis. From these data, the neurodevelopmental status before the onset, the clinical features of convulsions and EEG findings in the infantile period were demonstrated to be important prognostic factors in addition to etiology.