Ahmed Rabie El Arbagy¹, Mahmoud Abd El Aziz Koura¹, Abd El Samad Sobhy Abou El Nasr², Hany Said Elbarbary^1,

Objective: Investigate the influence of permeability of low-flux versus high-flux dialysis membranes on intact PTH during hemodialysis. Background: Hyperparathyroidism is a common finding in patients with renal insufficiency and parathyroid hormone (PTH) is considered a uremic toxin responsible for many of the abnormalities of the uremic state and bone disease. Materials and Methods: Forty adult patients on regular hemodialysis were enrolled in a prospective study. Low-flux polysulfone membranes were used for at least 6 months and then the patients were switched to use high-flux polysulfone membranes for 1 month. Serum electrolytes and intact PTH before and after dialysis were compared before and after changes in dialysis membrane. Results: At the end of the 1-month use of high-flux filters, predialysis intact PTH level (415.96 ± 226.72 ng/dL) showed a significant decline (P < 0.05) compared to the predialysis intact PTH (312.28 ± 191.98 ng/dL) with low-flux membranes. Intact PTH level correlated negatively with serum calcium and positively with serum phosphorus levels only in the predialysis samples with the use of low-flux but not high-flux filters. Conclusion: High-flux dialysis membranes are more efficient in removal of intact PTH, one of the middle-sized uremic toxins, than low-flux membranes.

Parathyroid hormone, ESRD, hemodialysis membrane