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Photic and Bemegride Activation of Triphasic Waves in Portal‐Systemic Encephalopathy
Author(s) -
KOJIMA Takuya,
MIYASAKA Matué,
MORIYA Hirobumi,
FUKUZAWA Hitoshi,
SHIMAZONO Yasuo
Publication year - 1971
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.1440-1819.1971.tb01501.x
Subject(s) - photic stimulation , stimulation , electroencephalography , medicine , neuroscience , psychology , visual perception , perception
Summary Photic stimulation from 0.5 to 20cps flickers was given on 7 cases of portal‐systemic encephalopathy. The triphasic waves were increased by the stimulation (mostly appearing synchronously with 2.0–3.5 cps of flicker) in all cases at least more than once in repeated EEG examinations. Bemegride activation was performed on three cases who had theta and alpha background activity with very poor delta waves. The triphasic waves increased in number remarkably in two cases and poorly in one. Based on these reactions to the photic stimulation and bemegride activation, it was suggested that the triphasic waves and epileptic discharges might have some similar mechanism in their production. (This study was presented at 18th annual meeting of Japan EEG Society, 1969