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Part 5: Peritoneal Solution |
Japan Peritoneal Dialysis-Mineral Bone Disorders (PD-MBD) Research Group
Correspondence to: Hiroyasu Yamamoto, Division of Kidney and Hypertension,
Department of Internal Medicine, Jikei University, School of Medicine, 3-25-8,
Nishi-Shinbashi, Minato-Ku, Tokyo 105-8461
Japan.
h-yamamoto{at}jikei.ac.jp
Background: In patients on continuous ambulatory
peritoneal dialysis (CAPD), dialysate calcium concentration has a strong
influence on correction of serum calcium, phosphorus, and parathyroid hormone
(PTH); however, the optimal concentration of Ca in PD solution is still
uncertain. The aim of the survey reported here was to evaluate the prevalence
of patients treated with standard- [SCD (approximately 3.25 - 4.0 mEq/L)] or
low-calcium [LCD (approximately 1.8 - 2.5 mEq/L)] dialysate and differences in
the clinical effects for correction of abnormalities in divalent ions and
PTH.
Materials and Methods: We used a questionnaire to survey
333 peritoneal dialysis facilities nationwide in Japan. Then, we analyzed
serum Ca, P, and PTH levels and the prescription rates for CaCO3 as
a P binder and for vitamin D (VitD) analogs.
Results: The 2384 CAPD patients enrolled in this analysis
had a mean age of 60.5 ± 14.2 years and a mean duration of CAPD of 44.1
± 39.2 months. The prevalences of SCD, LCD, and combination of SCD and
LCD were, respectively, 49%, 50%, and 1% at initiation, and 40%, 38%, and 22%
at the time of the survey. In 735 and 876 patients respectively, LCD and SCD
had been prescribed from initiation to the time of the survey. In these two
groups, we observed no difference in initiation and current serum levels of Ca
and P. But prescription rates for CaCO3 and VitD analogs were
higher in the LCD group than in the SCD group, and PTH levels were higher in
the LCD group than in the SCD group.
Conclusions: A beneficial effect of LCD was revealed in
the increased doses of CaCO3 and VitD analogs seen in that group
without the occurrence of hypercalcemia; however, PTH levels in that group
were not maintained within an acceptable range. The survey suggests that more
serious attention should be paid to the Ca concentration in peritoneal
dialysate so as to lessen mineral and PTH disorders in CAPD.
KEY WORDS: Standard-calcium dialysate; low-calcium dialysate; bone and mineral disorders; parathyroid hormone; PTH.
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