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Continuous, generalized, high-voltage fast activity and FIRDA in two children
Clinical EEG (Electroencephalography)
|April 1, 1992
Summary
Continuous, generalized, high-voltage fast rhythms on EEG, previously linked to infantile neuroaxonal dystrophy (INAD), may indicate widespread brain damage in other conditions like Menkes syndrome. This pattern, termed "extreme spindles," is not specific to INAD.
Area of Science:
- Neurology
- Neurophysiology
- Pediatric Neurology
Background:
- The electroencephalogram (EEG) pattern of continuous, generalized, high-voltage fast rhythms was considered a hallmark of infantile neuroaxonal dystrophy (INAD).
- This specific EEG activity was thought to be unresponsive to external stimuli or the sleep-wake cycle.
Observation:
- Researchers observed this characteristic EEG pattern in one child diagnosed with INAD and another with Menkes' kinky-hair syndrome.
- Both children presented with severe psychomotor disturbances.
- Their EEGs also displayed frontal intermittent rhythmic delta activity (FIRDA), a nonspecific indicator of organic encephalopathy.
Findings:
- The continuous, generalized, high-voltage fast activity in both cases exhibited characteristics resembling spindles.
- This led to the reinterpretation of this EEG pattern as "extreme spindles."
- The findings suggest that "extreme spindles" are not pathognomonic for INAD but rather a nonspecific sign of widespread organic brain damage.
Implications:
- This study broadens the differential diagnosis for the "extreme spindles" EEG pattern.
- It highlights the importance of considering conditions beyond INAD when this pattern is observed.
- The findings underscore the utility of EEG in identifying diffuse brain injury in pediatric neurological disorders.