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Quantitative Meta-Analyses: Lateralization of Memory Functions Before and After Surgery in Children with Temporal Lobe Epilepsy

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Abstract

Rationale

Memory deficits in children with epilepsy have been reported in some but not all studies assessing the effects of side of seizures and resection from the temporal lobe on cognitive performance. This meta-analysis provides a quantitative systematic review of previous studies on this issue.

Method

A critical review and meta-analysis of the literature on memory performance in children with Temporal Lobe Epilepsy (TLE) was conducted. Search identified 25 studies, 13 of which compared children with TLE to healthy age-matched controls and 12 of which compared children with TLE before and after surgery.

Results

Heterogeneity of the comparisons of children with TLE to healthy controls impeded drawing definitive conclusions. However, in 55% of the studies, verbal memory in children with left TLE (LTLE) was impaired as compared to healthy controls. Verbal memory performance slightly declines after pediatric LTLE surgery, but nonverbal memory tasks are not affected. By contrast, verbal memory performance is not affected by pediatric right TLE (RTLE) surgery.

Conclusions

The findings suggest that side of the epileptogenic zone and resection from the temporal lobe affect verbal memory in children with LTLE. Right resection seems to be safe with respect to verbal memory performance.

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adapted from Moher, Liberati, Tetzlaff, & Altman, 2009)

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Authors and Affiliations

  1. Comprehensive Epilepsy Center, Rambam Health Care Campus, Haifa, Israel

    Naomi Kahana Levy & Mony Benifla

  2. School of Behavioral Sciences, Academic College of Tel Aviv-Jaffa, P.O.B. 8401, 61083, Tel-Aviv-Jaffa, Israel

    Jonathan Segalovsky & Odelia Elkana

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  1. Naomi Kahana Levy
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Kahana Levy, N., Segalovsky, J., Benifla, M. et al. Quantitative Meta-Analyses: Lateralization of Memory Functions Before and After Surgery in Children with Temporal Lobe Epilepsy. Neuropsychol Rev 31, 535–568 (2021). https://doi.org/10.1007/s11065-020-09470-4

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