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Functional MRI lateralization of memory in temporal lobe epilepsy
J A Detre1, L Maccotta, D King
1Department of Neurology, University of Pennsylvania Medical Center, Philadelphia 19104, USA.
Neurology
|May 5, 1998
Summary
Functional magnetic resonance imaging (fMRI) can detect memory activation asymmetries in temporal lobe epilepsy (TLE) patients, aiding epilepsy surgery evaluation. This noninvasive technique shows promise for improving preoperative assessments.
Area of Science:
- Neuroimaging
- Epilepsy Research
- Cognitive Neuroscience
Background:
- Mesial temporal lobe function assessment is crucial for epilepsy surgery planning, predicting memory deficits, and seizure lateralization.
- Functional magnetic resonance imaging (fMRI) presents advantages over intracarotid amobarbital testing (IAT) for memory lateralization.
- fMRI has demonstrated success in language lateralization for temporal lobe epilepsy (TLE) patients.
Purpose of the Study:
- To assess the feasibility of using fMRI for detecting memory activation lateralization asymmetries in TLE patients.
- To compare fMRI findings with intracarotid amobarbital testing (IAT) results.
Main Methods:
- fMRI was performed on 8 healthy subjects and 10 TLE patients undergoing preoperative evaluation.
- A visual scene encoding task targeting mesial temporal activation was used during fMRI.
- Asymmetry ratios were calculated and compared to IAT results.
Main Results:
- Normal subjects showed symmetric memory activation, while TLE patients exhibited significant asymmetries.
- fMRI results for memory asymmetry agreed with IAT findings in 9 interpretable cases.
- Agreement included two cases of paradoxical IAT memory lateralization.
Conclusions:
- fMRI is a feasible method for detecting memory activation asymmetries in TLE.
- The noninvasive nature and spatial resolution of fMRI suggest its potential utility in epilepsy surgery preoperative evaluation.