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A characteristic EEG pattern in neonatal herpes simplex encephalitis
Insights
Electroencephalograms (EEGs) reveal unique patterns in infants with herpes simplex virus (HSV) encephalitis. Specific EEG findings can help diagnose HSV encephalitis in infants, potentially improving outcomes.
Area of Science:
- Neurology
- Pediatrics
- Infectious Diseases
Background:
- Herpes simplex virus (HSV) encephalitis is a severe condition in infants.
- Early diagnosis and treatment are crucial for improving outcomes.
- Electroencephalograms (EEGs) are used to monitor brain activity.
Purpose of the Study:
- To investigate the EEG patterns in infants diagnosed with HSV encephalitis.
- To determine if specific EEG findings can aid in the diagnosis of HSV encephalitis.
- To correlate EEG patterns with clinical outcomes in affected infants.
Main Methods:
- Acquisition of EEG data from six infants diagnosed with HSV encephalitis.
- Analysis of EEG patterns, including multifocal periodic or quasiperiodic discharges.
- Correlation of EEG findings with clinical presentation, treatment initiation, and patient outcomes.
Main Results:
- Four out of six infants exhibited a unique multifocal periodic or quasiperiodic EEG pattern.
- One infant initially showed a quasiperiodic pattern that evolved into a periodic pattern.
- A fifth infant developed a quasiperiodic pattern later in the disease course.
- The infant who received early diagnosis and treatment did not develop periodic EEG patterns and had a moderate motor delay.
- All infants who developed periodic EEG patterns either died or had severe encephalopathy.
Conclusions:
- A periodic EEG pattern in young infants with seizures and CSF pleocytosis is highly indicative of HSV encephalitis.
- Early detection of HSV encephalitis and prompt therapeutic intervention may alter EEG patterns and improve neurological outcomes.
- EEG analysis is a valuable tool in the diagnosis and prognostic assessment of HSV encephalitis in infants.
Abstract:
EEGs were obtained on six infants with herpes simplex virus (HSV) encephalitis. The first EEG of four of these infants showed a unique multifocal periodic or quasiperiodic pattern; in one of these, a periodic pattern subsequently replaced the quasiperiodic pattern. A fifth infant developed a quasiperiodic pattern on the eighteenth day. All of these infants died or were left with severe encephalopathy. A sixth infant was diagnosed and therapy initiated on day 2. The periodic pattern did not appear in any of this infant's EEGs, and at age 8 months he showed only a moderate motor delay. A periodic EEG in a young infant with partial motor seizures and CSF lymphocyte pleocytosis is virtually diagnostic of HSV encephalitis.