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Prognostic factors of infantile spasms from the etiological viewpoint
Insights
Early treatment and intermediate onset age are key for better seizure control and development in infantile spasms, particularly in cryptogenic cases. Prompt intervention significantly improves long-term outcomes.
Area of Science:
- Pediatric Neurology
- Developmental Neuroscience
Background:
- Infantile spasms (IS) are a severe epilepsy syndrome in infants.
- Prognosis varies significantly based on etiology and treatment response.
Purpose of the Study:
- To identify prognostic factors for seizure control and neurodevelopmental outcomes in infantile spasms.
- To analyze these factors across different etiological groups.
Main Methods:
- Retrospective analysis of 200 patients with infantile spasms, followed up to age six or older.
- Categorization into etiological groups (cryptogenic vs. symptomatic).
- Evaluation of age of onset, treatment lag, and relapse after ACTH therapy.
Main Results:
- Intermediate onset (4-12 months) was a favorable prognostic factor for seizure control in cryptogenic IS.
- A short treatment lag (0-2 months) correlated with better long-term mental and physical development in cryptogenic IS.
- No relapse after ACTH therapy in cryptogenic cases predicted normal development; this correlation was absent in symptomatic cases.
Conclusions:
- Early intervention and specific onset age ranges are critical for favorable outcomes in infantile spasms, especially for cryptogenic forms.
- Treatment lag is a significant modifiable factor influencing neurodevelopmental prognosis in cryptogenic IS.
- Etiology plays a crucial role in determining the impact of treatment and relapse on long-term prognosis.
Abstract:
We investigated the prognostic factors for mental and physical development and seizure control by dividing the subjects into various etiologic groups in 200 patients with infantile spasms, all of whom (except 48 who died) were aged six years or older. The results were as follows: 1) Intermediate (4-12 mos) onset was found to be a favorable prognostic factor for seizure control in cryptogenic cases, although there was no relation between the age of onset and prognosis in other etiologic groups. 2) There was a significant correlation between the treatment lag and long-term prognosis for mental and physical development only in cryptogenic cases. A short treatment lag (0-2 mos) was associated with a good prognosis. All cryptogenic patients who had no relapse after ACTH therapy developed normally, although in symptomatic cases, there was no correlation between the relapse and the outcome.