Abstract:
:This review describes the supposed mechanisms leading to idiopathic hypercalciuria (IHU) in childhood, further the diagnostic criteria and the proposed treatment modalities are discussed. IHU is not only one of the main causes of renal stone disease in children but it's also at the origin of the postglomerular haematuria and the frequency-dysuria syndrome. Its role in the development of osteoporosis in adults is also documented. The diagnosis of raised calcium excretion is based on age specific values during early infancy. In older children and adults a urinary calcium/creatinine ratio exceeding 0.6 mmol/mmol is regarded as elevated. Dietary calcium restriction can no longer be recommended for the treatment of IHU because it results in secondary hyperoxaluria and on the long-term causes decreased bone mineral density. Patients should be kept on dietary sodium restriction and high fluid intake. In cases IHU associated with recurrent episodes of macroscopic haematuria or recurrent stone disease a therapeutic trial with hydrochlorothiazide in the dose of 0.5-1 mg/kg/day with potassium-citrate supplementation and possibly magnesium citrate should be started. In some special forms of hypercalciuria such as the X-linked recessive nephrolithiasis syndrome or Bartter syndrome the localization and in some cases even the molecular mechanism of the events leading to increased calcium excretion are elucidated. In IHU enhanced Ca(++)-ATPase, and Na-Li countertransport activity and decreased Na+/K+ ATPase activity were described in the erythrocyte membrane model. It is expected that with the molecular genetic development the clinical classification of the hypercalciuric syndromes will become a rational genome-based one.
journal_name
Orv Hetiljournal_title
Orvosi hetilapauthors
Reusz Gsubject
Has Abstractpub_date
1998-12-06 00:00:00pages
2957-62issue
49eissn
0030-6002issn
1788-6120journal_volume
139pub_type
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