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Neonatal paroxysmal monorhythmic alpha activity
Insights
Neonatal seizures can manifest as rhythmic alpha brainwaves in the rolandic cortex. This pattern, linked to cortical atrophy and neurological issues, suggests encephalomalacia may cause these infant seizures.
Area of Science:
- Neonatal neurology
- Epileptology
- Neuroimaging
Background:
- Neonatal seizures are a critical concern in infant neurology.
- Electrographic seizure activity in neonates requires precise characterization.
- The specific electroencephalographic (EEG) patterns and their correlation with outcomes are actively researched.
Purpose of the Study:
- To investigate the characteristics of paroxysmal monorhythmic alpha activity in neonatal seizures.
- To correlate these electrographic findings with clinical seizures and neuroimaging results.
- To explore the potential role of encephalomalacia in the pathogenesis of these seizures.
Main Methods:
- Analysis of electroencephalographic (EEG) data from thirteen infants with neonatal seizures.
- Clinical observation of seizure activity.
- Computerized tomography (CT) scans performed weeks after electrographic abnormalities were detected.
- Correlation of EEG findings with neurological examinations and head circumference measurements.
Main Results:
- Thirteen infants exhibited paroxysmal monorhythmic electrographic activity, primarily in the alpha range (8-13 Hz), localized to rolandic cortical areas.
- This activity was often lateralized and associated with clinically observed seizures.
- In most cases (8/13), independent epileptiform discharges were also present.
- CT scans revealed diffuse or localized cortical atrophy mirroring the EEG abnormality.
- Focal neurological deficits and microcephaly were observed in infants with localized monorhythmic alpha activity.
Conclusions:
- Paroxysmal monorhythmic alpha activity represents a distinct electrographic seizure discharge in neonates.
- The findings suggest a strong association between this EEG pattern, cortical atrophy, and focal neurological abnormalities.
- Encephalomalacia is proposed as a significant factor in the pathogenesis of these neonatal seizures.
Abstract:
Thirteen infants with neonatal seizures showed paroxysmal monorhythmic electrographic activity, predominantly in the alpha range (8 to 13 Hz) and localized to the rolandic cortical areas. This rhythmic discharge, which is commonly lateralized, represents an electrical seizure discharge. Such discharges may exist as the only electrographic seizure activity, but in the majority of cases (8/13) independent epileptiform discharges are observed in other cortical areas. All infants with paroxysmal monorhythmic alpha activity had clinically observed seizures. Computerized tomography performed six or more weeks after observing the electrographic abnormality demonstrated diffuse as well as localized cortical atrophy in a distribution similar to the monorhythmic alpha activity. In other cases, localized monorhythmic alpha activity was correlated on subsequent evaluations with focal neurological abnormalities (eg, hemiparesis and hemiatrophy) and a high incidence of microcephaly (83%). On the basis of these findings, we suggest that encephalomalacia may be important in the pathogenesis of paroxysmal monorhythmic alpha seizures in the neonate.