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  • Title: Low- and high-turnover bone disease in continuous ambulatory peritoneal dialysis: effects of low-Ca2+ peritoneal dialysis solution.
    Author: Carozzi S, Nasini MG, Santoni O, Pietrucci A.
    Journal: Perit Dial Int; 1993; 13 Suppl 2():S473-5. PubMed ID: 8399644.
    Abstract:
    Calcium carbonate (CaCO3) is an effective phosphate (PO4) binder in uremics, and its use reduces aluminum (Al) intake. By maintaining high serum Ca2+, it decreases serum parathyroid hormone (PTH) levels. Hypercalcemia, however, often limits the dosage. In order to evaluate the effects of a low-Ca peritoneal dialysis solution (PDS) (1.25 mmol/L) on Ca metabolism, we studied the following in 12 continuous ambulatory peritoneal dialysis (CAPD) patients with hypercalcemia (6 with low PTH levels, low-turnover bone disease, group 1, and 6 with high PTH levels, high-turnover bone disease, group 2, documented by bone biopsies): serum Ca2+; serum PTH; bone morphology. The follow-up was 12 months. Results show that in both groups within the third month there was a decrease in serum Ca2+. In group 1 serum PTH increased, reaching the norm, and in group 2 it further increased exceeding the norm. Because in both groups serum Ca2+ was normal, it was possible to increase oral CaCO3 (10.5 +/- 2.5 g/day) to control PO4 levels and to stop Al gels. In group 2, in order to avoid the further rise of serum PTH, the low-Ca PDS was supplemented with 2 micrograms/day of 1,25(OH)2D3 (vitamin D3); this was followed by a reduction in serum PTH with no increase in Ca2+ and PO4. The use of low-Ca PDS may be useful in preventing hypercalcemia in CAPD patients treated with high oral doses of CaCO3 and in improving low-turnover bone disease, while low-Ca PDS supplemented with vitamin D3 improves high-turnover bone disease.
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