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Alpha-pattern coma in a 2-year-old child
Insights
Electroencephalography (EEG) in a comatose child with Reye's syndrome and hypoglycemia revealed continuous alpha activity, a pattern previously seen in adults. This transient EEG finding highlights the need for prompt serial studies in pediatric cerebral insults.
Area of Science:
- Pediatric Neurology
- Neurophysiology
- Critical Care Medicine
Background:
- Reye's syndrome is a rare but serious condition that causes swelling in the liver and brain.
- Hypoglycemia, or low blood sugar, can lead to severe neurological complications.
- Alpha activity on an electroencephalogram (EEG) typically indicates wakefulness, making its presence during coma unusual.
Observation:
- A two-year-old child with Reye's syndrome and prolonged hypoglycemia presented with continuous, diffuse 8- to 9-Hz alpha activity while comatose.
- Serial EEG monitoring demonstrated a gradual decrease in alpha activity and the emergence of delta waves over 18 hours.
- Subsequent EEGs revealed electrocerebral silence, indicating a severe decline in brain function.
Findings:
- The observed EEG pattern, characterized by diffuse alpha activity in a comatose patient, closely resembled the "alpha-pattern coma" previously described in adults post-anoxia.
- This suggests a potential shared mechanism of diffuse cortical-subcortical insult, possibly triggered by hypoglycemia in this pediatric case.
- The transient nature of this EEG pattern is a critical observation.
Implications:
- The findings suggest that diffuse alpha activity in pediatric coma may represent a specific, albeit transient, neurophysiological response to severe cerebral insults.
- Prompt and serial EEG examinations are crucial for identifying this pattern in children following acute brain injury.
- This could aid in earlier diagnosis and potentially guide management strategies for severe pediatric encephalopathies.
Abstract:
An EEG of a two-year-old child with Reye's syndrome complicated by prolonged hypoglycemia showed continuous, diffusely distributed, 8- to 9-Hz, well-modulated alpha activity while the patient was comatose. Continuous monitoring of EEG showed gradual reduction of alpha activity and the appearance of moderate-amplitude delta waves within the next 18 hours. Subsequent EEGs showed electrocerebral silence. The EEG features and their evolution resembled those described in postanoxic "alpha-pattern coma" in adults. A diffuse cortical-subcortical insult, possibly due to hypoglycemia, may be responsible for the generation of diffuse alpha activity in our case. Because of its transient nature, immediate and serial EEG studies following the acute cerebral insult may be necessary to demonstrate this pattern in children.