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Quantifying interictal metabolic activity in human temporal lobe epilepsy.

T R Henry1, J C Mazziotta, J Engel

  • 1Department of Neurology, School of Medicine, University of California, Los Angeles.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|September 1, 1990
PubMed
Summary

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Interictal hypometabolism in temporal lobe epilepsy often affects the temporal lobe and thalamus. This study developed a new method to analyze [18F]fluorodeoxyglucose positron emission tomography (FDG PET) scans, revealing widespread metabolic changes.

Area of Science:

  • Neuroscience
  • Medical Imaging
  • Epilepsy Research

Background:

  • Complex partial seizures often originate in the temporal lobe.
  • Interictal [18F]fluorodeoxyglucose positron emission tomography (FDG PET) commonly shows temporal hypometabolism in these patients.
  • Extratemporal hypometabolism is also frequently observed.

Purpose of the Study:

  • To develop a standardized anatomical analysis method for FDG PET in temporal lobe epilepsy.
  • To accurately quantify metabolic alterations in interictal FDG PET studies.
  • To investigate the extent of hypometabolism in unilateral temporal lobe epilepsy.

Main Methods:

  • A standardized visual method for placing regions of interest on FDG PET images was developed.
  • The method was adapted for widespread, asymmetric metabolic alterations typical of temporal lobe epilepsy.

Related Experiment Videos

  • A single, blinded investigator analyzed 10 normal controls and 25 interictal temporal lobe epilepsy patient studies.

    • Main Results:

    • The analysis confirmed ipsilateral thalamic and temporal lobe hypometabolism in unilateral temporal lobe epilepsy.
    • Reduced metabolism was also observed in ipsilateral frontal, parietal, and basal ganglia regions.
    • Temporal lobe and thalamic metabolism showed the most significant reductions.

    Conclusions:

    • The developed method provides reliable anatomical analysis for FDG PET in temporal lobe epilepsy.
    • Unilateral temporal lobe epilepsy is associated with widespread interictal hypometabolism extending beyond the temporal lobe.
    • The thalamus is significantly involved in the hypometabolic network of temporal lobe epilepsy.