[Electroencephalographic background activity and blood biochemistry data in patients with chronic renal failure during chronic hemodialysis].

There is no particular electroencephalographic activity known to be associated with consciousness disturbance in uremic patients; however, a slow wave activity is generally observed during consciousness disturbance. Abnormal electroencephalographic activity was observed in 30 (67%) of 45 chronic renal failure patients during chronic hemodialysis without consciousness disturbance, and slow wave activity was observed in 58%. The frequency of the electroencephalographic background activity correlated with blood urea nitrogen (BUN) and serum Ca levels, but not with K, IP, and creatinine levels. Electroencephalographic activity can be estimated with reference to BUN or serum Ca levels in the blood of uremic patients.