A comparison between averaged spikes and individual visually-analyzed spikes in rolandic epileptiform discharges
Arq. neuropsiquiatr
;
60(3B): 699-701, Sept. 2002. ilus, tab
Article
in English
| LILACS
| ID: lil-325478
ABSTRACT
PURPOSE:This study compared some morphological features of individual rolandic epileptiform discharges, used to obtain an averaged estimate, with those of the resulting estimate. METHOD: Twenty-four averaged discharges from EEGs of 24 children showing rolandic spikes were compared with 480 individual discharges used in the averaging. The analysis was based on the occurrence of tangential dipole and "double spike" patterns. RESULTS: In 15 averaged discharges the tangential dipole pattern was found. Individual spikes used in the averaging process displayed the same pattern in 35-100 percent of them; in the remaining 9 averaged discharges, up to 20 percent of the individual spikes showed the same pattern, although this was not found in the averaged waveforms. "Double spike" pattern was found in 11 of the averaged waveforms and was recognized in 50-100 percent of its individual discharges, whereas up to 45 percent of individual spikes showed this pattern without expression in the averaged waveform. CONCLUSION: When visually analyzing an EEG with rolandic spikes, caution should be exercised in characterizing these patterns, since a few discharges showing them may not be expressed in the averaged waveform and the clinical correlations proposed for these patterns may not apply
Full text:
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Index:
LILACS (Americas)
Main subject:
Action Potentials
/
Epilepsy, Rolandic
/
Electroencephalography
Limits:
Child
/
Humans
Language:
English
Journal:
Arq. neuropsiquiatr
Journal subject:
Neurology
/
Psychiatry
Year:
2002
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
UNIFESP/BR
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