Signal characteristics of intraventricular electrodes recordings in human epilepsy: A case report

Jerry J. Shih, Ernst Rodin, Vivek Gupta, Robert E. Wharen

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The case of a patient with intractable temporal lobe seizures and inadvertent unilateral intraventricular depth electrode placement is presented. The resting electroencephalograph (EEG) showed marked amplitude differences between the intraventricular electrode on the left and the parenchymal electrode on the right. All recorded seizures originated on the left side and in spite of its intraventricular location, frequency power spectra during the early ictal phase showed a marked increase in power for all frequency bands in the left depth electrode, exceeding that on the right. Analysis with Brain Electrical Source Analysis (BESA) software demonstrated marked ictal baseline shifts which were initially limited to the left side but changed to the right during clinical secondary generalization. In the immediate postictal state, all, except for infraslow, frequencies were markedly reduced in power. We conclude that intraventricular depth electrode contacts placed adjacent to the hippocampal structure can record interictal and ictal activity for all frequency bands, albeit at reduced amplitudes. Furthermore, infraslow activity can provide supplementary information about the epileptogenic zone.

Original languageEnglish (US)
Pages (from-to)105-111
Number of pages7
JournalClinical EEG and Neuroscience
Issue number2
StatePublished - Apr 2012


  • DC shifts
  • depth electrode
  • infraslow activity
  • intraventricular electrode
  • seizures

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology


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