title: Regional distribution of interictal 31P metabolic changes in patients with temporal lobe epilepsy.
abstract: OBJECTIVE
  We compared the 31P metabolites in different brain regions of patients with temporal lobe epilepsy (TLE) with those from controls.
  
  
  METHODS
  Ten control subjects and 11 patients with TLE were investigated with magnetic resonance imaging (MRI) and [31P]MR spectroscopic imaging (MRSI). [31P]MR spectra were selected from a variety of brain regions inside and outside the temporal lobe.
  
  
  RESULTS
  There were no asymmetries of inorganic phosphate (Pi), pH, or phosphomonoesters (PME) between regions in the left and right hemispheres of controls. In patients with TLE, Pi and pH were higher and PME was lower throughout the entire ipsilateral temporal lobe as compared with the contralateral side and there were no significant asymmetries outside the temporal lobe. The degree of ipsilateral/contralateral asymmetry for all three metabolites was substantially greater for the temporal lobe than for the frontal, occipital, and parietal lobes, and these asymmetries provided additional data for seizure localization. As compared with levels in controls, Pi and pH were increased and PME were decreased on the ipsilateral side in patients with TLE. There were changes in Pi, pH, and PME on the contralateral side in persons with epilepsy as compared with controls, contrary to changes on the ipsilateral side.
  
  
  CONCLUSIONS
  Our findings provide some insight into the metabolic changes that occur in TLE and may prove useful adjuncts for seizure focus lateralization or localization.
authors.affiliation: Department of Radiology, University Hospital Utrecht, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: van der Grond
authors.forename: J R
authors.initials: JR
authors.lastname: Gerson
authors.forename: K D
authors.initials: KD
authors.lastname: Laxer
authors.forename: J W
authors.initials: JW
authors.lastname: Hugg
authors.forename: G B
authors.initials: GB
authors.lastname: Matson
authors.forename: M W
authors.initials: MW
authors.lastname: Weiner
mesh_terms: D000328:Adult; D001921:Brain / Q000378:metabolism*; D002540:Cerebral Cortex / Q000378:metabolism; D004833:Epilepsy, Temporal Lobe / Q000175:diagnosis* / Q000378:metabolism; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D010755:Organophosphates / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism; D010759:Phosphorus Isotopes; D013702:Temporal Lobe / Q000378:metabolism
chemical_list: D010755:Organophosphates; D010710:Phosphates; D010759:Phosphorus Isotopes