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Author Spotlight: Advancing Pediatric Epilepsy Surgery in Children Through Novel Biomarkers and Enhanced Localization
Published on: September 20, 2024
Remembrance and time passed: Memory outcomes 4-11 years after pediatric epilepsy surgery
Klajdi Puka1, Mary Lou Smith1,2,3
1Department of Psychology, The Hospital for Sick Children, Toronto, Ontario, Canada.
Insights
Long-term cognitive outcomes after pediatric epilepsy surgery show no significant improvements over time. Seizure freedom offers memory advantages but not enhanced recall, highlighting the need for further research into epilepsy treatment effects.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Cognitive Psychology
Background:
- Long-term cognitive outcomes after pediatric epilepsy surgery remain poorly understood.
- While brain plasticity suggests potential for long-term improvement, evidence within the first two years is inconclusive.
Purpose of the Study:
- To examine long-term memory function in pediatric epilepsy patients.
- To compare cognitive outcomes between surgical and non-surgical groups 4-11 years post-intervention.
Main Methods:
- 88 patients with childhood-onset intractable epilepsy were assessed.
- 53 patients underwent resective epilepsy surgery.
- Verbal and visual memory were evaluated at baseline and long-term follow-up using standardized recall tests.
Main Results:
- No overall improvements in memory function were observed over time.
- Outcomes were largely independent of surgical status.
- Seizure-free patients demonstrated better story recall but no improvement; extratemporal epilepsy patients showed word list recall decline; left temporal lobe epilepsy patients had lower story recall.
Conclusions:
- Achieving seizure freedom provides memory advantages but does not lead to cognitive improvement over time.
- Findings impact understanding of epilepsy surgery outcomes and antiepileptic drug management.
Objective:
Little is known about the long-term cognitive outcomes following pediatric epilepsy surgery. Although the evidence for change within the first 2 years is not compelling, the plasticity of the immature brain may allow for improvements in the long term. This study examined memory function in a cohort of surgical and nonsurgical patients at baseline and 4-11 years after.
Method:
Participants were 88 patients (mean age 20.05, standard deviation [SD] 4.21 years) with childhood-onset intractable epilepsy; 53 had undergone resective epilepsy surgery. Verbal and visual memory were assessed at baseline and follow-up using standardized tests of recall of stories, faces, word pairs, and word lists.
Results:
Improvements over time were not found; outcomes were largely independent of surgical status. Those who were seizure-free at follow-up had better story recall at both times (p = 0.028), and did not show improvement. Among patients with extratemporal lobe epilepsy, significant declines in word list recall were found over time irrespective of surgical or seizure status (p = 0.010). Effects of laterality of seizure focus were evident only when examining patients with temporal lobe epilepsy (TLE); patients with left TLE had lower story recall scores compared to patients with right TLE at long-term follow-up (p = 0.043).
Significance:
Patients who became seizure-free had some advantages in memory, but did not show improvements over time. These findings have important implications for understanding potential outcomes from surgery or continued use of antiepileptic medications.
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