[Oscillating visual evoked potential in epilepsy].
The authors studied visual evoked potentials (VEP) at the O, P, C and T leads in response to light flashes of 0.09, 0.18 and 0.36 W/s in 19 normal and 43 epileptic subjects. In 75% of the patients the VEPs were characterized by a high amplitude oscillatory response (OVEP) in the form of a series of 5.5 oscillations with a 10 Hz frequency, the mean latent period of its development being 230 ms. In the normal subjects the OVEP was observed in only 30% of cases and had a lower amplitude, longer latent period and corresponded to the normal after-discharge according to all parameters. Some common features characteristic of the OVEP in epilepsy and the after-discharge in normal conditions suggest that the OVEP is generated by thalamic rhythmogenic mechanisms which are involved in the reaction earlier and more actively as a result of disinhibition of the subcortical multisynaptic systems. The OVEP is an indicator confirming the diagnosis of epilepsy.
D000293:Adolescent; D000328:Adult; D001921:Brain / Q000503:physiopathology*; D002648:Child; D004827:Epilepsy / Q000503:physiopathology*; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010507:Periodicity; D013788:Thalamus / Q000503:physiopathology; D014795:Visual Pathways / Q000503:physiopathology
Ostsilliatornyĭ zritel'nyĭ vyzvannyĭ potentsial pri épilepsii.