EEG in Japanese encephalitis: a clinico-radiological correlation

Area of Science:

• Neurology
• Infectious Diseases
• Neurophysiology

Background:

• Limited research exists on electroencephalographic (EEG) changes in Japanese encephalitis (JE).
• Understanding EEG patterns and their correlation with clinical and radiological findings in JE is crucial for patient management.

Purpose of the Study:

• To investigate electroencephalographic (EEG) changes in patients with Japanese encephalitis (JE).
• To correlate EEG findings with clinical presentation, radiological imaging, and patient outcomes.

Main Methods:

• Retrospective analysis of 27 Japanese encephalitis (JE) patients.
• EEG recordings, Glasgow Coma Scale (GCS) assessment, and neuroimaging (MRI/CT) were performed.
• Clinical outcomes were assessed at 3-month follow-up.

Main Results:

• Three EEG patterns were observed: diffuse delta (n=21), delta with spikes (n=3), and 'alpha pattern' coma (n=3).
• All patients showed bilateral thalamic involvement on imaging; other brain regions were variably affected.
• EEG patterns did not correlate with GCS or patient outcomes, with 7 patients showing poor recovery.

Conclusions:

• EEG in JE typically shows non-specific delta activity in the acute phase.
• 'Alpha pattern' coma, a distinct EEG finding, may be more prevalent than previously thought and does not invariably indicate a poor prognosis.
• Further research is needed to elucidate the prognostic value of specific EEG patterns in JE.