Seizure activity in the rat hippocampus, perirhinal and prefrontal cortex associated with transient global cerebral ischemia

D. A. Caruana, C. Nesbitt, D. G. Mumby, C. A. Chapman

Research output: Contribution to journalArticle

Abstract

Epileptiform EEG activity associated with ischemia can contribute to early damage of hippocampal neurons, and seizure activity may also lead to dysfunction in extrahippocampal regions. In this study, seizure activity associated with the four-vessel occlusion model of cerebral ischemia was monitored using chronically implanted electrodes in the CA1/subicular region, the perirhinal cortex, and the prefrontal cortex of the rat. Background EEG amplitude was reduced in all recording sites during occlusion, but spiking and bursting activity was also observed. Seizure activity occurred in most animals during the first several hours of reperfusion, but was not observed on subsequent days. Epileptiform spikes and bursts were often synchronous between two or three recording sites, and spikes in the CA1 region also often occurred just prior to spikes in other sites. These results demonstrate that the four-vessel occlusion model can lead to patterns of seizure activity in the hippocampus, prefrontal and perirhinal cortices.

Original languageEnglish
Pages (from-to)401-411
Number of pages11
JournalJournal of Neural Transmission
Volume115
Issue number3
DOIs
Publication statusPublished - 1 Mar 2008

Keywords

  • Anoxia
  • CA1
  • Excitotoxicity
  • Infralimbic
  • Parahippocampal
  • Rat
  • Seizure

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