Seizures in Japanese encephalitis.

Area of Science:

• Neurology
• Infectious Diseases
• Epidemiology

Background:

• Japanese encephalitis (JE) is a significant cause of viral encephalitis in Asia.
• Seizures are a known complication of JE, but their frequency, characteristics, and correlation with clinical, EEG, and radiological findings are not well-documented.

Purpose of the Study:

• To determine the frequency, pattern, and severity of seizures in Japanese encephalitis patients.
• To investigate the correlation between seizures and electroencephalography (EEG) and radiological findings in JE.
• To analyze the outcomes of JE patients with and without seizures.

Main Methods:

• A retrospective analysis of 65 Japanese encephalitis patients diagnosed between 1991 and 1999.
• Clinical evaluation, seizure assessment, cranial CT/MRI, and EEG recordings were performed.
• Statistical analysis using the Z test of proportion was employed to evaluate relationships between variables.

Main Results:

• Seizures occurred in 46% of JE patients during the acute phase.
• Generalized tonic-clonic seizures were most common; 2 patients presented with status epilepticus.
• EEG showed slowing in all seizure patients; MRI revealed thalamic lesions in 24 patients.
• Glasgow Coma Scale score, focal weakness, EEG slowing, and thalamic/cortical lesions were significantly associated with seizures.

Conclusions:

• Japanese encephalitis is frequently associated with seizures, particularly in severe cases.
• Seizures in JE are generally controllable with monotherapy.
• Specific clinical and radiological findings correlate with seizure occurrence in JE patients.