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Positron emission tomography receptor studies in epilepsy
1Institute of Neurology, National Hospital for Neurology & Neurosurgery, London, UK.
Revue Neurologique
|September 3, 1999
Summary
Positron emission tomography (PET) scans reveal neurotransmitter abnormalities in epilepsy. Reduced central benzodiazepine receptor binding is common at seizure foci, while opioid receptor changes occur in specific epilepsy types.
Area of Science:
- Neuroscience
- Radiology
- Epileptology
Background:
- Neurotransmitter system abnormalities are implicated in epilepsy pathophysiology.
- Positron emission tomography (PET) with specific ligands offers insights into neuroreceptor function.
- Structural neuroimaging is crucial for interpreting PET data.
Purpose of the Study:
- To investigate neurotransmitter receptor abnormalities in epilepsy using PET.
- To correlate PET findings with structural imaging and clinical presentation.
- To explore the diagnostic utility of PET ligands in presurgical epilepsy evaluation.
Main Methods:
- Utilized PET ligands targeting central benzodiazepine (cBZR) and opioid receptors.
- Performed voxel-based and region-based analyses with partial volume effect correction.
- Correlated PET findings with magnetic resonance imaging (MRI) and seizure types.
Main Results:
- Reduced cBZR binding observed at epileptic foci, often more restricted than hypometabolism.
- Focal increases in cBZR binding found in cortical malformations and MRI-normal areas.
- Increased mu- and delta-opioid receptors noted in temporal neocortex overlying mesial temporal epileptic foci.
Conclusions:
- PET imaging reveals diverse neuroreceptor abnormalities in epilepsy.
- cBZR and opioid receptor PET may identify epileptogenic zones and widespread network dysfunction.
- Further research is needed to establish the role of PET in presurgical epilepsy assessment.