The activity of urine lithiasis as the factor of formation of a secondary long-lasting pyelonephritis among children

102 pupils with a secondary long-lasting pyelonephritis (49 persons with the obstructive form of disease, 53-with not obstructive) were under examination. All patients were given laboratory-tool methods standard for pyelonephritis, and also their daily accretion with urine of salts (oxalates, phosphates, lithates) was determined, as well as anticrystal-forming abilities of urine on calcium and on phosphorus, and an estimation of lithiasis processes in urine was given. The increase of average level of daily excretion with urine oxalates, phosphates, lithates, and anticrystal-forming abilities of urine on phosphorus is noted in case of not obstructive long-lasting pyelonephritis. 74,5 % of the examined children were found to have urine lithiasis processes of various degree of expressiveness with prevalence of crystaluria of the combined character.