[Diagnostic significance of electrocortical responses to rhythmic and solitary photic stimuli in patients with hepato-portal encephalopathy].

In order to clarify some diagnostical criteria of latent hepato-portal encephalopathy in 57 patients with intrahepatic forms of portal hypertension the authors studied the character of driving response in photorhythmical stimulation. In 9 patients the development of evoked potentials depending upon the significance of the stimula was studied as well. The studies confirmed the prognostical significance of a slowing down the mean frequency of rhythms in the EEG in relation to the development of acute encephalopathy and a certain tendency to the shift in the spectrum of driving responses to low frequency and a worsening of driving responses in slowing down the medium rhythm frequency of EEG.