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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
Published on: August 5, 2014
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Functional connectivity MRI and post-operative language performance in temporal lobe epilepsy: initial experience.
Emanuele Pravatà1, Carlo Sestieri2, Gabriella Colicchio3
1Neuroradiology Department, Neurocenter of Italian Switzerland; Lugano, Switzerland - Department of Neuroradiology, Catholic University of Rome; Rome, Italy - emanuele.pravata@gmail.com.
The Neuroradiology Journal
|April 23, 2014
Summary
Preoperative functional connectivity (FC) in the language network predicts verbal-IQ decline after anterior temporal lobectomy for epilepsy. Stronger interhemispheric connectivity and less left-lateralization indicate a higher risk of post-surgical language impairment.
Area of Science:
- Neuroscience
- Epilepsy Research
- Cognitive Neurology
Background:
- Anterior temporal lobectomy (ATL) effectively treats drug-resistant temporal lobe epilepsy (TLE).
- Post-surgical language impairment, particularly verbal-IQ decline, remains a concern after ATL.
- Preoperative functional connectivity (FC) of the language network correlates with verbal-IQ, suggesting its predictive potential.
Purpose of the Study:
- To investigate correlations between preoperative FC of the language network and post-operative verbal-IQ decline in patients with TLE.
- To identify potential preoperative biomarkers for predicting language outcomes after ATL.
Main Methods:
- Assessed FC within the language network (Interhemispheric-FC and Left Hemisphere FC) using fMRI in five patients with non-tumoral left TLE.
- Estimated language lateralization indexes preoperatively.
- Correlated preoperative FC measures and lateralization indexes with 12-month post-operative verbal-IQ decline.
Main Results:
- Verbal-IQ decline was inversely correlated with the degree of left language lateralization.
- Verbal-IQ decline was directly correlated with the strength of Interhemispheric-FC.
- No significant correlation was found between Left Hemisphere FC and post-operative verbal-IQ change.
Conclusions:
- Stronger preoperative interhemispheric connectivity within the language network, coupled with less defined left-hemisphere lateralization, may serve as an unfavorable prognostic biomarker for verbal-IQ decline after ATL.
- These findings, from a limited patient cohort, highlight the importance of preoperative language network assessment for surgical planning in TLE.
