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J Korean Neurol Assoc. 1999;17(3):370-375.
- The Clinical Usefulness of Ictal Surface EEG in Neocortical Epilepsy
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Sang Kun Lee, Joo-Yong Kim, Hyun-Woo Nam
Department of Neurology, Seoul National University College of Medicine
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Department of Neurology
Seoul National University Hospital
28 Yonkeun dong, Chongno ku, Seoul 110-744, Korea
- 신피질성 간질에서의 발작기 두피뇌파의 유용성
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이상건, 김 주용, 남 현우
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서울대학교 의과대학 신경과학교실
- Abstract
- Background
Localizable scalp ictal EEG appears to be rare in neocortical epilepsy. However, there have not been
many studies based upon a large number of patients. This study aims to identify the characteristic patterns of variable
neocortical epilepsies and to evaluate their clinical usefulness in the localization of epileptogenic foci. Methods: We
retrospectively assessed 394 noninvasive ictal recordings from 86 patients who subsequently underwent invasive study
and resective surgery. Ictal EEGs were recorded by video-EEG monitoring systems with electrodes placed according to
the international 10-20 system including additional anterior temporal electrodes. Ictal recordings were analyzed accord-ing
to the localizing accuracy and frequency characteristics. The durations of discrete or regional ictal rhythms were
also measured. Results: The percentage of discrete or regional EEGs were respectively 26, 52, 70, and 10% in frontal
lobe epilepsy (FLE), lateral temporal lobe epilepsy, occipital lobe epilepsy (OLE), and parietal lobe epilepsy (PLE).
The ictal rhythms in the order of frequency were theta, delta, beta, alpha, and rhythmic spike-and-wave. The duration
of discrete or regional ictal rhythms were significantly shorter in FLE and PLE than in other epilepsies. Ictal beta activ-ity
was the most common rhythm in discrete-patterned EEGs. There were some tendencies of poor lateralization in the
presence of structural lesion. Types of seizure were not related with the degree of localization except for simple partial
seizure. Conclusions: Ictal surface EEG was clinically helpful in the localization of epileptogenic foci especially in
particular neocortical epileptic syndromes.
J Kor Neurol Ass 17(3):370 ~ 375, 1999
Key Words : Neocortical epilepsy, Ictal surface EEG, Localization
Keywords :
- 초록
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