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The bone mineral content (BMC) of the lower end of the femur was measured by photon absorptiometry in 87 patients with chronic renal failure. The gamma-ray photon source was Am241. Serial measurements were obtained for up to two years. The mean BMC of the adult patients, comprising: 18 pre-dialysis (CRF), 41 chronic haemodialysis (CHD) and 19 renal transplant (RT) patients were all significantly lower than controls with the exception of the male CRF group. Two adults and one child on chronic haemodialysis showed a significant rate of bone loss (less than 2% per year). In one of these adults the addition of daily oral 1 alpha hydroxycholecalciferol was associated with no further reduction in BMC. Two children and one adult on chronic haemodialysis showed a significant rate of increase in BMC (less than 2% per year). This adult had had a tendency to loss of BMC on standard CHD treatment but after receiving parenteral 1,25 dihydroxycholecalciferol three times weekly showed a significant rate of loss of BMC on serial measurement. Two adults and one child with CRF had a significant rate of increase in BMC on standard treatment.

Urodiolenone is a substance that appears as the glucuronide in the urine of 1 in 3 hypertensive subjects. It is a potent inhibitor of Na⁺, K⁺-ATPase in kidney tissue of the guinea pig, as measured by cytochemical assay. Chemical and mass spectrometric evidence is presented, from which it is concluded that urodiolenone is a sesquiterpenoid substance, is a bicyclic enone with a vicinal diol side chain, and has molecular formula C₁₅H₂₄0₃.

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