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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Predicting memory decline from left temporal lobe epilepsy surgery using preoperative fMRI: a multicenter study.

William L Gross1, Sara J Swanson2, Alexander I Helfand3

  • 1Department of Neurology, Medical College of Wisconsin, Milwaukee, WI, United States; Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, WI, United States.

Neuroimage. Clinical
|May 27, 2025
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Summary
This summary is machine-generated.

Functional MRI (fMRI) language laterality can predict verbal memory decline after epilepsy surgery. This study confirms fMRI

Keywords:
Epilepsy surgeryLanguage lateralityTemporal lobe epilepsyVerbal memory

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Area of Science:

  • Neuroscience
  • Epileptology
  • Medical Imaging

Background:

  • Predicting verbal memory decline after epilepsy surgery is crucial for patient counseling.
  • Functional MRI (fMRI) language laterality is a potential predictor, but evidence is not definitive.
  • The FATES project aimed to validate fMRI's predictive capability in a multicenter cohort.

Purpose of the Study:

  • To determine if a multivariable model including fMRI language laterality can predict verbal memory outcomes 6 months after left temporal lobe epilepsy surgery.
  • To assess the independent contribution of fMRI language laterality index (LI) to predicting memory changes.

Main Methods:

  • Prospective observational cohort study at 10 US epilepsy centers.
  • 70 adults undergoing left temporal lobe epilepsy surgery with hippocampal resection.
  • Preoperative fMRI language mapping using a semantic decision versus tone decision (SDTD) task.
  • Multiple linear regression analysis incorporating preoperative memory, epilepsy duration, age, hippocampal sclerosis, and fMRI SDTD LI.

Main Results:

  • Verbal memory decline was observed in 8%-28% of patients across five memory measures.
  • Changes in all memory measures correlated significantly with preoperative scores, epilepsy duration, and fMRI SDTD LI.
  • fMRI LI independently accounted for 7%-25% of the variance in memory changes (p < 0.05).

Conclusions:

  • Models incorporating fMRI language LIs from SDTD tasks meaningfully predict verbal memory decline after left temporal lobe surgery.
  • These fMRI-based protocols are practical for implementation and aid in informing patients about surgical risks.
  • Confirms previous evidence supporting the use of fMRI for predicting verbal episodic memory outcomes post-surgery.