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Related Experiment Videos

Neurophysiological studies in herpes simplex encephalitis

U K Misra1, J Kalita

  • 1Department of Neurology, Sanjay Gandhi PGIMS, Lucknow, India.

Electromyography and Clinical Neurophysiology
|June 25, 1998
PubMed
Summary
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Electro-encephalogram (EEG) and evoked potentials were studied in herpes simplex encephalitis (HSE) patients. While EEG abnormalities are common in HSE, evoked potential changes are infrequent, potentially indicating HIV co-infection.

Area of Science:

  • Neurology
  • Infectious Diseases
  • Neurophysiology

Background:

  • Herpes simplex encephalitis (HSE) is a severe neurological condition.
  • Simultaneous electro-encephalogram (EEG) and evoked potential (EP) studies in HSE are not well-documented.
  • EEG changes are known in HSE, but EP findings are less understood.

Purpose of the Study:

  • To report EEG and EP findings in patients with HSE.
  • To investigate the diagnostic utility of EEG and EPs in HSE.
  • To explore potential correlations between EP abnormalities and co-infections like HIV.

Main Methods:

  • Conducted simultaneous EEG and evoked potential (somatosensory and motor) studies in 9 HSE patients.
  • Assessed patients' clinical status, seizure activity, and neuroimaging (CT/MRI) findings.

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  • Analyzed EEG patterns and EP parameters (central motor conduction time, somatosensory evoked potentials).

    • Main Results:

    • All 9 patients exhibited initial EEG abnormalities, including delta slowing and epileptiform discharges.
    • EEG normalized in 6 patients by 3 months, but this did not correlate with clinical recovery.
    • Evoked potentials (upper limb) were normal in all patients; lower limb motor and sensory evoked potentials were unrecordable in one severe case with HSV-1 and AIDS.

    Conclusions:

    • EEG is frequently abnormal in HSE and provides valuable diagnostic information.
    • Evoked potential changes in HSE are infrequent.
    • Unrecordable evoked potentials in HSE patients may suggest co-infection with HIV.