[Repetitive rhythmic spikes in epileptic children].
Repetitive rhythmic spikes (RRSs') sometimes appear periodically for 0.2-2.0 seconds at localized in epileptic children. We selected 11 patients (male 6, female 5) with RRSs for this study. Ages were 3-15 years (average 10.7 years). We counted the number of spikes which were recorded on the scalp EEG. The duration of RRSs and the differences of amplitude between large and small spikes on monopolar montages were examined. We also studied the appearance of spikes under different recording conditions; waking and sleep stages, photic stimulation and hyperventilation. Furthermore, we made two dimensional joint-dot plotting for the interval between repetitive spikes. RRSs were classified into two groups. In the first group, joint-dots of RRSs were locally observed between 0.2-0.8 sec. In the second, they were disseminated between 0.2-2.0 sec. In two groups, spikes were mainly observed in the sleep EEG (stage 1). The average number of spikes in the first group was 18.7/min, and that in the second was 25.7/min. The average difference of the amplitude between large and small spikes was 103 microV in the first group, and 88 microV in the second group. The average duration of spikes was 54.2 msec in the first group and 62.4 msec in the second group. From these results, it was assumed that some of spikes in the first group occurred in the surface of the cortex and that some of spikes in the second group were projected from the deep region in the cortex.
Oana
Y
Y
Department of Neuropsychiatry, Tokyo Medical College Hospital.
Irie
H
H
Uchino
A
A
Yoshida
K
K
Utsugi
Y
Y
Miura
S
S
D000293:Adolescent; D000367:Age Factors; D002540:Cerebral Cortex / Q000503:physiopathology; D002648:Child; D002675:Child, Preschool; D004569:Electroencephalography; D004827:Epilepsy / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D010507:Periodicity