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Minerals and bone-modulating hormones in children on continuous ambulatory peritoneal dialysis
Insights
Continuous ambulatory peritoneal dialysis (CAPD) in children improves mineral metabolism but causes peritoneal losses of calcium and vitamin D. Replenishment is necessary to manage these losses effectively.
Area of Science:
- Nephrology
- Pediatrics
- Mineral Metabolism
Background:
- Children undergoing continuous ambulatory peritoneal dialysis (CAPD) often experience disturbances in mineral metabolism and bone health.
- Understanding the impact of CAPD on mineral and bone-modulating hormone fluxes is crucial for managing pediatric patients.
Purpose of the Study:
- To investigate peritoneal fluxes of minerals (calcium, phosphorus, magnesium) and bone-modulating hormones (parathormone, vitamin D metabolites) in children on CAPD.
- To assess the impact of these fluxes on serum levels and bone mineralization.
- To evaluate the overall effect of CAPD on mineral metabolism in pediatric patients.
Main Methods:
- Studied peritoneal fluxes and serum levels of minerals and bone-modulating hormones in 7 children on CAPD.
- Utilized mass transfer studies to quantify mineral losses into peritoneal effluents.
- Assessed bone mineralization through sequential densitometries.
Main Results:
- Modest losses of calcium were observed in peritoneal effluents.
- Substantial peritoneal losses of phosphorus and magnesium did not normalize hyperphosphatemia or hypermagnesemia in most patients.
- Parathormone and vitamin D metabolites (25-hydroxyvitamin D, 1,25-dihydroxyvitamin D) were detected in peritoneal effluents.
- Improved bone mineral content correlated with amelioration of hyperparathyroidism.
Conclusions:
- CAPD in children generally improves disturbed mineral metabolism.
- Significant peritoneal losses of calcium and vitamin D metabolites occur, necessitating appropriate replenishment strategies.
- Monitoring and managing these losses are essential for optimizing bone health in pediatric CAPD patients.
Abstract:
Peritoneal fluxes of minerals and bone-modulating hormones and their impact on corresponding serum levels and bone mineralization in 7 children on continuous ambulatory peritoneal dialysis (CAPD) were studied. Most mass transfer studies revealed modest losses of calcium into peritoneal effluents. Peritoneal losses of phosphorus and magnesium, although substantial, were not sufficient to normalize hyperphosphatemia and hypermagnesemia in most patients. Parathormone and vitamin D metabolites (25-hydroxyvitamin D and 1,25-dihydroxyvitamin D) were readily detectable in peritoneal effluents. Improved bone mineral content, by sequential densitometries, was associated with amelioration of hyperparathyroidism. These data suggest that CAPD in children induces an overall improvement of disturbed mineral metabolism; nevertheless, peritoneal losses of calcium and vitamin D metabolites must be considered and replenished appropriately.