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Electroencephalography in herpes simplex encephalitis.

C W Lai1, M E Gragasin

  • 1Department of Neurology, University of Kansas Medical Center, Kansas City 66103.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|January 1, 1988
PubMed
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Electroencephalography (EEG) shows varied abnormalities in acute herpes simplex encephalitis (HSE), with focal findings highly suggestive of HSE. EEG is more sensitive than imaging in the acute phase but doesn't predict outcomes.

Area of Science:

  • Neurology
  • Neurophysiology

Background:

  • Herpes simplex encephalitis (HSE) is a severe neurological condition.
  • Electroencephalography (EEG) is a key diagnostic tool in neurological disorders.

Observation:

  • EEG in acute HSE presents diverse abnormalities: periodic sharp waves, amplitude attenuation, slow waves, epileptiform discharges, and seizures.
  • Focal or lateralized EEG abnormalities during encephalitis are highly indicative of HSE.
  • EEG sensitivity surpasses CT scans and radioisotope brain scans in the acute HSE stage.

Findings:

  • Periodic discharges are exclusive to the acute phase of HSE.
  • EEG findings do not correlate with survival rates or disability severity.
  • EEG changes exhibit a temporal lag behind clinical manifestations.

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Implications:

  • EEG is a crucial, sensitive tool for early HSE detection.
  • While not predictive of prognosis, EEG monitoring aids in understanding disease course.
  • Normalizing EEG post-acute stage suggests recovery but doesn't guarantee functional outcome.