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The influence of dialysate calcium concentration on the PTH level in children undergoing CAPD
M Sieniawska1, M Roszkowska-Blaim, B Wojciechowska
1University Children's Hospital, Department of Pediatrics and Nephrology, Warsaw, Poland.
Insights
Standardizing parathyroid hormone (PTH) measurement protocols is crucial for evaluating parathyroid gland function in children on continuous ambulatory peritoneal dialysis (CAPD). This ensures accurate assessment for vitamin D metabolite treatment decisions.
Area of Science:
- Pediatric Nephrology
- Endocrinology
- Renal Dialysis
Background:
- Children undergoing continuous ambulatory peritoneal dialysis (CAPD) often experience disturbances in mineral and bone metabolism.
- Parathyroid hormone (PTH) levels are critical indicators of bone disease in these patients.
- Accurate assessment of PTH is essential for guiding treatment with vitamin D metabolites.
Purpose of the Study:
- To investigate the impact of different calcium concentrations in peritoneal dialysis (PD) fluid on calcium mass transfer (CaMT) and serum intact parathyroid hormone (iPTH) levels in children on CAPD.
- To determine the optimal conditions for measuring PTH in pediatric CAPD patients to ensure reliable assessment of parathyroid gland function.
Main Methods:
- Serum iPTH, ionized calcium (iCa), and CaMT were measured in 12 children on CAPD over three consecutive days.
- Measurements were taken after an inter-dialysis interval, and after a 4-hour dwell time using PD fluid with Ca 3.5 mEq/L and Ca 2.5 mEq/L.
Main Results:
- A significantly more negative CaMT was observed with PD Ca 2.5 mEq/L compared to PD Ca 3.5 mEq/L.
- Significantly lower PTH values were recorded after the inter-dialysis interval compared to dwell periods.
- Variability in PTH measurements suggests a need for standardized protocols.
Conclusions:
- The calcium concentration in PD fluid significantly influences CaMT in pediatric CAPD patients.
- PTH levels fluctuate based on the timing of measurement relative to dialysis exchanges.
- Standardization of PTH measurement protocols is essential for accurate parathyroid function evaluation and therapeutic decisions regarding vitamin D metabolites in children on CAPD.
Abstract:
In 12 children aged four-and-a-half to 18 years (mean 11 +/- 4.2) undergoing continuous ambulatory peritoneal dialysis (CAPD), serum intact parathyroid hormone (iPTH), ionized calcium (iCa) levels, and calcium mass transfer (CaMT) were measured on three consecutive days: day 1, after a four-hour interval between dialyses; on day 2, after four hours dwell time with peritoneal dialysis (PD) Ca 3.5 mEq/L; and on day 3, after four hours dwell time with PD Ca 2.5 mEq/L. A significantly more negative CaMT was found when PD Ca 2.5 mEq/L was used, as compared with values obtained using PD Ca 3.5 mEq/L. Significantly lower parathyroid hormone (PTH) values were found after the interval between exchanges. We conclude that in order to properly evaluate parathyroid gland function and to decide whether or not to give vitamin D metabolites, a protocol for determining PTH should be standardized.