[Importance of dietary sodium in the hypercalciuria syndrome and nephrolithiasis]

The studies involved 20 children with idiopathic hypercalciuria (IH). An influence of urinary sodium excretion, and reflection of its intake, on urinary calcium excretion has been assessed. Children who were normocalciuric had significancy lower values of urine sodium excretion when compared with those with persisting hypercalciuria. The main factor responsible for hypercalciuria in children seemed to be urine sodium excretion. As urine sodium excretion reflects its intake, reduction dietary salt, rather than calcium intake, may be useful in the management of children with hypercalciuria and nephrolithiasis.