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Neurophysiological changes in Japanese encephalitis.

J Kalita1, U K Misra

  • 1Department of Neurology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow- 226 014, India.

Neurology India
|October 23, 2002
PubMed
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Neurophysiological evaluation in Japanese encephalitis (JE) shows motor evoked potentials (MEP) correlate with patient outcomes. Abnormal MEPs in JE patients indicate prognostic significance for recovery.

Area of Science:

  • Neurology
  • Neurophysiology
  • Infectious Diseases

Background:

  • Japanese encephalitis (JE) is a severe encephalomyelitis with limited neurophysiological studies.
  • Understanding neurophysiological changes is crucial for evaluating JE's impact and prognosis.

Purpose of the Study:

  • To conduct a comprehensive neurophysiological evaluation in JE patients.
  • To correlate electrophysiological findings with clinical presentation and outcomes.

Main Methods:

  • Sixty-five JE patients underwent detailed clinical evaluation, neuroimaging (CT/MRI), EEG, motor evoked potentials (MEP), sensory evoked potentials (SEP), nerve conduction studies, and electromyography (EMG).
  • Outcomes were assessed at 3 months as poor, partial, or complete recovery.

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Main Results:

  • Motor evoked potentials were abnormal in 34/46 patients, frequently showing patchy or focal abnormalities.
  • EEG showed nonspecific slowing in 45 patients, while EMG revealed fibrillations in 23.
  • MEP abnormalities correlated with muscle weakness and 3-month outcomes, unlike EEG, SEP, or EMG findings.

Conclusions:

  • Motor evoked potentials are frequently abnormal in Japanese encephalitis and hold prognostic significance.
  • Neurophysiological assessment, particularly MEP, aids in predicting recovery and guiding patient management in JE.