[EEG studies before and after hemodialysis].

For a sample of 10 men and 11 women EEGs were recorded, the first being made immediately before hemodialysis, the second immediately after, and the remainder at fixed subsequent periods. Apart from traditional visual evaluation every EEG was recorded on tape, to permit computer analysis of frequencies.--The visual evaluation showed in nearly all cases an increase of dysrhythmic waves after hemodialysis. More than half the patients had additional pathological patterns, especially during hyperventilation.--Special frequency analysis of the basic rhythm in 14 cases proved that the slight acceleration, which normally lasts from the morning to the evening, was disarranged. This disturbance extended at a weaker rate to the following day. In 9 of the 14 cases the frequency of the basic rhythm was slower in the morning after treatment than at the matutinal EEG-recording immediately preceding treatment.