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Electroencephalographic findings in urea-cycle disorders.

N P Verma, Z H Hart, K A Kooi

    Electroencephalography and Clinical Neurophysiology
    |February 1, 1984
    PubMed
    Summary

    Electroencephalograms (EEGs) in infants with urea-cycle disorders often show abnormalities like spikes and sharp waves. These EEG changes may indicate a characteristic manifestation of these metabolic conditions.

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    Area of Science:

    • Pediatric Neurology
    • Metabolic Disorders
    • Neurophysiology

    Background:

    • Urea-cycle disorders are genetic conditions affecting ammonia metabolism.
    • Neurological complications, including seizures, are common in urea-cycle disorders.
    • The electroencephalogram (EEG) is a key tool for assessing brain activity.

    Purpose of the Study:

    • To review EEG findings in infants diagnosed with urea-cycle disorders.
    • To identify characteristic EEG abnormalities associated with these metabolic conditions.
    • To correlate EEG findings with clinical presentation and serum ammonia levels.

    Main Methods:

    • Retrospective review of 11 electroencephalograms (EEGs) from 4 infants.
    • Analysis of EEG patterns including spikes, sharp waves, and slow-wave activity.

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  • Correlation of EEG data with clinical seizure history and biochemical parameters.

    • Main Results:

    • All reviewed EEGs showed abnormalities, predominantly multiareal spikes, spike-waves, or sharp-and-slow-wave activity.
    • Specific patterns like exaggerated spindle-delta bursts and monorhythmic paroxysmal theta activity were observed.
    • EEG alterations correlated with elevated serum ammonia levels, though normal EEGs were seen with slightly elevated levels.

    Conclusions:

    • Epileptiform EEG alterations appear to be a characteristic manifestation of urea-cycle disorders in infants.
    • EEG findings can provide valuable diagnostic clues in the context of suspected metabolic encephalopathies.
    • Further research is warranted to fully elucidate the neurophysiological impact of urea-cycle disorders.