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Nephrocalcinosis and idiopathic hypercalciuria.

V García Nieto1, M Muros de Fuentes, M Quintero Quintero

  • 1Sección de Nefrologia, Hospital Nuestra Señora de la Candelaria, Tenerife, Canary Islands, Spain.

Child Nephrology and Urology
|January 1, 1991
PubMed
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Idiopathic hypercalciuria in children can lead to nephrocalcinosis. This condition is associated with higher calciuria, altered calciuria/magnesuria ratios, and reduced urinary concentrating ability.

Area of Science:

  • Pediatric Nephrology
  • Biochemistry
  • Medical Imaging

Background:

  • Idiopathic hypercalciuria (IH) is a common metabolic disorder in children.
  • Nephrocalcinosis, the deposition of calcium salts in the renal parenchyma, can be a complication of IH.
  • The exact factors contributing to nephrocalcinosis in IH remain unclear.

Purpose of the Study:

  • To investigate the biochemical and sonographic differences between children with idiopathic hypercalciuria and nephrocalcinosis versus those with idiopathic hypercalciuria alone.

Main Methods:

  • Ultrasound examination to detect nephrocalcinosis in 28 children with idiopathic hypercalciuria.
  • Biochemical analysis of urinary parameters, including calciuria, magnesuria, and osmolality.
  • Statistical comparison between children with and without nephrocalcinosis.

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Main Results:

  • Nephrocalcinosis was identified in 6 out of 28 children via ultrasound.
  • Children with nephrocalcinosis exhibited significantly higher calciuria (p<0.05) and calciuria/magnesuria ratios (p<0.05).
  • Lower maximum urinary osmolality (p<0.01) and a negative correlation between calciuria and urinary concentration capacity (p<0.05) were observed in the nephrocalcinosis group.

Conclusions:

  • Specific biochemical profiles, including elevated calciuria and impaired urinary concentration, are associated with nephrocalcinosis in children with idiopathic hypercalciuria.
  • Further research is needed to fully elucidate the mechanisms leading to calcium salt deposition in the kidneys in this population.