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Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
Published on: December 18, 2016
Metabolic profiles and correlation with surgical outcomes in mesial versus neocortical temporal lobe epilepsy
Hao-Yue Zhu1, Yong-Xiang Tang2, Ling Xiao2
1Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
Aims:
Differentiating mesial temporal lobe epilepsy (MTLE) and neocortical temporal lobe epilepsy (NTLE) remains challenging. Our study characterized the metabolic profiles between MTLE and NTLE and their correlation with surgical prognosis using 18 F-FDG-PET.
Methods:
A total of 137 patients with intractable temporal lobe epilepsy (TLE) and 40 age-matched healthy controls were recruited. Patients were divided into the MTLE group (N = 91) and the NTLE group (N = 46). 18 F-FDG-PET was used to measure the metabolism of regional cerebra, which was analyzed using statistical parametric mapping. The volume of abnormal metabolism in cerebral regions and their relationship with surgical prognosis were calculated for each surgical patient.
Results:
The cerebral hypometabolism of MTLE was limited to the ipsilateral temporal and insular lobes (p < 0.001, uncorrected). The NTLE patients showed hypometabolism in the ipsilateral temporal, frontal, and parietal lobes (p < 0.001, uncorrected). The MTLE patients showed extensive hypermetabolism in cerebral regions (p < 0.001, uncorrected). Hypermetabolism in NTLE was limited to the contralateral temporal lobe and cerebellum, ipsilateral frontal lobe, occipital lobe, and bilateral thalamus (p < 0.001, uncorrected). Among patients who underwent resection of epileptic lesions, 51 (67.1%) patients in the MTLE group and 10 (43.5%) in the NTLE group achieved Engel class IA outcome (p = 0.041). The volumes of metabolic increase for the frontal lobe or thalamus in the MTLE group were larger in non-Engel class IA patients than Engel class IA patients (p < 0.05).
Conclusions:
The spatial metabolic profile discriminated NTLE from MTLE. Hypermetabolism of the thalamus and frontal lobe in MTLE may facilitate preoperative counseling and surgical planning.
Insights
Differentiating mesial temporal lobe epilepsy (MTLE) and neocortical temporal lobe epilepsy (NTLE) is challenging. Positron emission tomography (PET) metabolic profiling can distinguish these epilepsy types and predict surgical outcomes.
Area of Science:
- Neurology
- Nuclear Medicine
- Epilepsy Research
Background:
- Distinguishing mesial temporal lobe epilepsy (MTLE) from neocortical temporal lobe epilepsy (NTLE) is clinically significant for treatment planning.
- Metabolic profiling using 18F-FDG-PET offers a potential method to differentiate these epilepsy subtypes.
Purpose of the Study:
- To characterize the distinct metabolic profiles of MTLE and NTLE using 18F-FDG-PET.
- To investigate the correlation between metabolic patterns and surgical prognosis in patients with temporal lobe epilepsy (TLE).
Main Methods:
- 137 patients with intractable TLE (91 MTLE, 46 NTLE) and 40 controls underwent 18F-FDG-PET.
- Statistical parametric mapping analyzed regional cerebral metabolism.
- Volumes of abnormal metabolism and their relationship with surgical outcomes (Engel class) were assessed.
Main Results:
- MTLE showed hypometabolism in temporal/insular lobes and hypermetabolism elsewhere.
- NTLE exhibited hypometabolism in temporal, frontal, and parietal lobes, with distinct hypermetabolism patterns.
- Higher rates of favorable surgical outcomes (Engel class IA) were observed in MTLE (67.1%) compared to NTLE (43.5%).
- Increased frontal lobe or thalamus metabolism in MTLE correlated with poorer surgical outcomes.
Conclusions:
- Spatial metabolic patterns identified by 18F-FDG-PET effectively differentiate MTLE from NTLE.
- Thalamic and frontal lobe hypermetabolism in MTLE patients may serve as a biomarker for surgical planning and prognosis.
