The metabolism of aluminum and aluminum-related encephalopathy.

The dialysis encephalopathy syndrome is at once the most widely recognized and most severe manifestation of aluminum toxicity. Evidence linking this syndrome and aluminum intoxication is virtually incontrovertible. The syndrome is characterized by speech and motor difficulties, dementia, and seizures. Less widely recognized symptoms include subtle changes in cognition and personality and directional disorientation. Since the widespread use of water treatment, aluminum exposure in the dialysis population has been primarily via intravenous (IV) medications and oral aluminum-containing, phosphate-binding antacid gels. In addition to the encephalopathy syndrome, aluminum has been linked to toxicity in bone, parathyroid gland, RBC, and kidney. These organ toxicities seem to be the result of specific protein enzyme inhibition. Currently identified factors that affect aluminum accumulation and modulate aluminum balance include uremia, renal function, parathyroid hormone withdrawal and suppression, 1,25-dihydroxycholecalciferol, and serum aluminum binding. Impaired renal function is not a prerequisite for increased tissue aluminum burdens. It is likely that aluminum-related disease will be increasingly observed in populations other than those with chronic renal failure.