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Cellulose phosphate and chlorothiazide in childhood idiopathic hypercalciuria
Insights
Idiopathic hypercalciuria in children was assessed. Cellulose phosphate, combined with chlorothiazide, effectively reduced urinary calcium and improved stone formation symptoms in non-responsive cases.
Area of Science:
- Pediatric Nephrology
- Mineral Metabolism
Background:
- Idiopathic hypercalciuria (IH) is a common cause of nephrolithiasis in children.
- Understanding the specific type of hypercalciuria (absorptive vs. renal) is crucial for effective management.
- Previous treatments have shown variable success rates.
Purpose of the Study:
- To differentiate between absorptive and renal hypercalciuria in children with IH.
- To evaluate the efficacy of chlorothiazide and cellulose phosphate in managing hypercalciuria and associated symptoms.
Main Methods:
- A calcium loading test was administered to assess calcium handling.
- Children received chlorothiazide, with or without the addition of cellulose phosphate.
- Urinary calcium excretion levels and clinical symptoms were monitored.
Main Results:
- The hyperabsorptive form of hypercalciuria was identified in five out of seven children tested.
- Chlorothiazide alone normalized urinary calcium in two of six patients.
- Combination therapy with chlorothiazide and cellulose phosphate normalized urinary calcium in four patients and showed clinical improvement in another.
Conclusions:
- Idiopathic hypercalciuria in children can be effectively classified using calcium loading tests.
- Combination therapy with chlorothiazide and cellulose phosphate offers a promising treatment strategy for children with recalcitrant hypercalciuria and recurrent stone formation.
Abstract:
A calcium loading test performed on seven of eight children with idiopathic hypercalciuria identified the hyperabsorptive form of hypercalciuria in five and renal hypercalciuria in one. The type of hypercalciuria was not identified in the other patient. Three children presented with hematuria without calculus formation. Chlorothiazide reduced the urinary calcium excretion level in two of six patients to the normal range. The addition of cellulose phosphate to chlorothiazide reduced the urinary calcium excretion level to the normal range in those four patients who showed an incomplete response to chlorothiazide alone. There was clinical improvement with cellulose phosphate in another child whose symptoms did not disappear after chlorothiazide had reduced urinary calcium level to the normal range. Cellulose phosphate is effective in children with recurrent stone formation who have shown inadequate response to chlorothiazide.