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Clinical correlates of frontal intermittent rhythmic delta activity in children
Nathan Watemberg1, Revital Gandelman, Miri Y Neufeld
1Pediatric Neurology Unit, Wolfson Medical Center, Holon, Israel. nwatemberg@pol.net
Insights
Frontal intermittent rhythmic delta activity (FIRDA) is rare in children and not linked to acute encephalopathy or brain lesions. Its occurrence and characteristics may differ in cognitively impaired children versus those who are cognitively normal.
Area of Science:
- Pediatric Neurology
- Clinical Neurophysiology
- Neuroscience
Background:
- Frontal intermittent rhythmic delta activity (FIRDA) is an EEG pattern with an unclear origin.
- In adults, FIRDA is associated with encephalopathy, not deep midline or infratentorial pathology.
- The significance of FIRDA in pediatric populations remains understudied.
Purpose of the Study:
- To analyze the electrographic characteristics of pediatric FIRDA.
- To investigate the clinical associations of FIRDA in children.
- To determine if FIRDA differs in children with varying cognitive statuses.
Main Methods:
- Retrospective analysis of 1500 EEG studies.
- Identification of pediatric patients with FIRDA (ages 1.5-17 years).
- Correlation of FIRDA occurrence with clinical data, including cognitive status, epilepsy history, and brain pathology.
Main Results:
- FIRDA was detected in 20 of 1500 pediatric EEG studies (rare occurrence).
- Most children were awake and without acute encephalopathy during FIRDA.
- Half of the children had cognitive impairment; half had epilepsy. FIRDA duration was longer in the cognitively impaired group. No deep midline or infratentorial lesions were found.
Conclusions:
- Pediatric FIRDA is rare, occurs during wakefulness, and is not associated with acute encephalopathy or specific brain lesions.
- FIRDA characteristics may differ between cognitively normal and impaired children.
- FIRDA in children does not appear to signify the same pathology as in adults.
Abstract:
Frontal intermittent rhythmic delta activity is an electrographic pattern of unclear origin. Previously thought to correlate with deep midline and infratentorial pathology, rather, it appears to be associated with encephalopathy states in adults. The significance of frontal intermittent rhythmic delta activity in children has not been studied. We analyzed the electrographic characteristics and clinical associations of pediatric frontal intermittent rhythmic delta activity. This pattern was rarely detected, occurring in 20 of 1500 electroencephalographic (EEG) studies. Patients' ages ranged between 1.5 and 17 years. Most patients were awake and showed no signs of acute encephalopathy when frontal intermittent rhythmic delta activity occurred. Half of the children were cognitively impaired, and half had a history of epilepsy. Epileptiform activity was present in 55% of the EEG recordings. However, frontal intermittent rhythmic delta activity was part of the epileptiform discharge in only a minority of cases. The duration of frontal intermittent rhythmic delta activity bursts was longer in the mentally retarded group. Most patients did not have structural brain pathology. None had deep midline or infratentorial lesions. In conclusion, frontal intermittent rhythmic delta activity is rare in children, is not associated with acute encephalopathy or with deep midline or infratentorial lesions, and tends to occur during wakefulness. The electrographic characteristics of frontal intermittent rhythmic delta activity appear to differ between cognitively normal and mentally retarded children.