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Longitudinal Study of EEG‐Spike Appearance in Long‐Term Follow‐up Patients With Epilepsy
Author(s) -
Hosokawa Kiyoshi,
Kugoh Toshiaki,
Otsuki Saburo
Publication year - 1979
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1111/j.1440-1819.1979.tb00184.x
Subject(s) - electroencephalography , hyperventilation , spike (software development) , epilepsy , audiology , incidence (geometry) , provocation test , medicine , anesthesia , psychology , neuroscience , pathology , mathematics , geometry , management , alternative medicine , economics
Summary Fluctuations of the spike component on EEG were studied in 66 epileptic patients under clinical observations for six years or more. During this time five or more EEG recordings were taken once a year. 1. There was no statistical correlation between the number of well controlled cases in the last three years (27.3%) and the disappearance rate of EEG spike on the three most recent EEG recordings. In the group of patients still having seizures, the incidence of the spike on the three recent EEGs was more and inconsistent. 2. When the cases were divided into primary generalized and partial epilepsies, there was no significant difference in the incidence of spike between the two groups with and without seizures. 3. As for the type of spike appearance, 34 cases were of the focal type (51.5%). In 11 cases, spike was not seen even once (16.7%). There were five cases (7.5%) where it was difficult to determine whether the spike belonged to the centrencephalic or focal type. 4. The incidence (presence or absence) of the spike per one EEG record fluctuated and ranged from 0–100% in each case. 5. In 21 cases (31.8% of the total; 61.7% of the focal spike group) there was a shift of the localized area. 6. The effectiveness of provocation by hyperventilation and photic stimulation was poor.