When the aluminium content of the water supply to our Haemodialysis Unit rose from <0.5 umol/1 to 6 umol/l over a two month period, we carried out bone biopsies and desferrioxamine infusion tests on twelve (12) patients who had been on haemodialysis for less than one year (mean 8 months) and had normal serum aluminium levels. The patients had no bone symptoms. Eight patients had positive aluminium bone stains. The aluminium osteomalacia group (n=8) had a mean PTH of 1.4 ng/ml s.e. 0.3 whereas the non-ALO group had a mean PTH of 2.9 ng/ml s.e. 0.7. The difference in mean PTH is significant (p<0.05). There was no evidence of encephalopathy, fractures or microcytic anaemia in the ALO positive group. The aluminium contamination of the water supply occurred because of a change in the reservoir purification system from sand-filtration to alum. © 1990 Springer.
