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EEG in neonatal herpes simplex encephalitis.

K Sainio, M L Granström, O Pettay

    Electroencephalography and Clinical Neurophysiology
    |December 1, 1983
    PubMed
    Summary
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    Herpes simplex encephalitis in newborns can cause electrical seizures on EEGs. These seizures, along with abnormal EEG background, correlate with poor clinical outcomes, suggesting a need for consideration in diagnosing infant encephalitis.

    Area of Science:

    • Neonatal Neurology
    • Pediatric Infectious Diseases
    • Clinical Neurophysiology

    Background:

    • Herpes simplex encephalitis (HSE) is a severe neurological condition in newborns.
    • Accurate and timely diagnosis is crucial for effective management and improved outcomes.
    • Electroencephalography (EEG) is a key diagnostic tool in evaluating neonatal neurological disorders.

    Purpose of the Study:

    • To analyze EEG findings in newborns diagnosed with herpes simplex encephalitis.
    • To identify specific EEG patterns associated with HSE in this population.
    • To explore the correlation between EEG abnormalities and clinical outcomes.

    Main Methods:

    • Analysis of electroencephalograms (EEGs) from 21 newborns with confirmed herpes simplex encephalitis.

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  • Detailed examination of seizure activity, including focal or unilateral electrical seizures.
  • Assessment of EEG background abnormalities and their relationship to clinical presentation.

    • Main Results:

    • 76% of neonates with HSE exhibited electrical seizures on EEG, characterized by sharp or slow waves at pseudo-periodic intervals.
    • Seizure paroxysms varied in duration, with longer durations observed in some patients.
    • A correlation was found between prolonged seizures, abnormal EEG background, and poorer clinical outcomes.

    Conclusions:

    • The presence of specific EEG seizure paroxysms in newborns with encephalitis warrants consideration of herpes simplex virus as the etiology.
    • EEG findings, particularly seizure characteristics and background abnormalities, can provide prognostic information.
    • Early EEG analysis aids in the diagnosis and management of neonatal herpes simplex encephalitis.