“…However, excess or defi ciency of trace elements, which was disregarded until several years ago, has recently been noticed as one of the factors that induce complications in dialyzed patients. In 1972, Alfrey et al [1] reported cases of dialysis dementia possibly due to aluminum intoxication [2], A number of observations indicate a high aluminum concentration in plasma, which may accelerate dialysis dementia and re nal osteodystrophy [3][4][5][6]. In the plasma of dialyzed pa tients, zinc concentration is decreased [7,8], and copper concentration increased [7,9].…”