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Interictal 99mTc-HMPAO SPECT in temporal lobe epilepsy: relation to clinical variables
R A Avery1, I G Zubal, C Studholme
1Department of Diagnostic Radiology, Yale University School of Medicine, New Haven, Connecticut 06520-8018, USA.
Epilepsia
|August 8, 2001
Summary
Interictal SPECT in temporal lobe epilepsy (TLE) shows laterality matters. Right TLE blood flow correlates with age and epilepsy duration, unlike left TLE, suggesting distinct disease processes.
Area of Science:
- Neurology
- Radiology
- Epilepsy Research
Background:
- Interictal blood flow patterns in temporal lobe epilepsy (TLE) using single-photon emission computed tomography (SPECT) lack systematic study.
- Understanding these patterns is crucial for TLE management and surgical planning.
Purpose of the Study:
- To systematically evaluate factors affecting interictal SPECT findings in a large cohort of TLE patients.
- To correlate SPECT-derived asymmetry indices (AIs) with various clinical variables before temporal lobectomy.
Main Methods:
- Interictal 99mTc-HMPAO SPECT scans from 61 TLE patients were analyzed.
- Region of interest (ROI) analysis was performed on temporal and frontal lobes, and cerebellum.
- Asymmetry indices (AIs) were calculated and correlated with clinical variables.
Main Results:
- TLE patients showed significant AIs in anterior, lateral, and whole temporal regions compared to controls.
- No consistent overall correlation between AIs and clinical variables was found.
- In right TLE (RTLE) only, AIs correlated positively with age of onset and negatively with epilepsy duration in specific temporal regions.
Conclusions:
- Laterality of TLE influences the correlation between interictal blood flow and clinical variables like age of onset and epilepsy duration.
- These findings suggest distinct underlying physiological processes in right versus left TLE.
- Clinical applicability of these specific correlations remains limited.