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Longitudinal study of epileptiform EEG patterns in normal children
Insights
Epileptiform electroencephalogram (EEG) patterns are common in children but rarely indicate epilepsy. Most childhood EEG abnormalities resolve spontaneously and are linked to behavioral or motor adaptation issues, not seizures.
Area of Science:
- Pediatric Neurology
- Neurophysiology
- Child Psychiatry
Background:
- Epileptiform EEG patterns are occasionally detected in neurologically normal children.
- The clinical significance and long-term prognosis of these findings remain areas of investigation.
Purpose of the Study:
- To investigate the prevalence and clinical significance of epileptiform EEG patterns in a large cohort of children.
- To determine the long-term outcomes, including the development of epilepsy, in children with these EEG findings.
Main Methods:
- Electroencephalogram (EEG) recordings were obtained from 3,726 neurologically normal children aged 6-13 years during wakefulness, rest, and hyperventilation.
- Follow-up studies were conducted over 8-9 years to monitor for clinical changes and the development of seizures.
- EEG abnormalities were classified, and their association with behavioral and psychomotor disturbances was assessed.
Main Results:
- Epileptiform patterns were identified in 3.54% of children, with various types of discharges observed.
- Half of the children with EEG abnormalities exhibited behavioral problems or psychomotor disturbances.
- Most EEG abnormalities resolved spontaneously by adolescence, and only seven children developed epilepsy, which responded to treatment.
Conclusions:
- The majority of epileptiform EEG patterns in children are not indicative of epilepsy and likely reflect adaptation difficulties.
- Generalized discharges may have a genetic link to epilepsy, whereas focal spikes are probably non-epileptic.
- Spontaneous resolution of EEG abnormalities is common, suggesting a benign prognosis for most affected children.
Abstract:
EEG were recorded in 3,726 children, from 6 to 13 years of age who were neurologically normal and had no history of epileptic seizures. The records were taken during wakefulness, at rest, and during hyperventilation. In 131 cases (3.54%) epileptiform patterns were found. They consisted of 3 count/sec spike and slow waves discharges (4 cases), multiple spike and slow wave complexes (37 cases), midtemporal spikes (50 cases), rolandic or parietal spikes (27 cases), occipital spikes (2 cases), and multifocal spikes (11 cases). Half of the subjects with EEG abnormalities had behavior problems and/or slight psychomotor ability disturbances. Follow-up studies over an 8 to 9 year period were performed. These demonstrated the spontaneous disappearance of the EEG abnormalities, usually within school age or, at the latest, during adolesence. Only seven individuals developed epileptic seizures of the primary generalized type which responded well to anticonvulsant drug treatment. From this study we can deduce that the epileptiform EEG patterns that often are found in children during school age have no clinical relationship to epilepsy in the great majority of cases. The relationship with epilepsy exists probably on a genetic level for the generalized discharges. The spike foci are non-epileptic in nature in all probability, especially if they emerge from a fairly normal background activity and their duration is very similar to that of the constituents of the background activity, as found in the majority of these subjects. On the contrary, it is probable that these alterations express difficulties in affective or motor adaptation during childhood.