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Electroencephalographic findings in urea-cycle disorders
Insights
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.
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.
- 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.
Abstract:
Eleven electroencephalograms in 4 infants with urea-cycle disorders were reviewed. All infants had one or more abnormal EEGs. The abnormalities consisted mainly of multiareal spikes, spike-waves, or sharp-and-slow-wave activity. In addition, one patient, a term infant, exhibited exaggerated spindle-delta bursts. This infant, and also one other at a similar age, had monorhythmic paroxysmal theta activity. Clinically, all patients had seizures shortly preceding abnormal EEGs. EEG alterations were encountered over a wide range of elevated serum ammonia levels. Normal EEGs occurred in the face of slightly elevated levels. It is concluded that epileptiform EEG alterations may be a characteristic manifestation of urea-cycle disorders.