The aim of this study is to assess the serum uric-acid lowering effect of losartan in children with proteinuric nephropathies. Patients already treated with enalapril will be randomized to receive losartan and/or enalapril in a cross-over designed study. Those who recruit the inclusion criteria will receive enalapril and/or losartan during a one month period, followed by a 15 days of wash out (under enalapril treatment). On day 46, the second period of 30 days of treatment start (enalapril or losartan, whichever was not received initially). Before randomization, a baseline 24 hours urine and a fasting blood sample will be obtained to assess uric acid excretion and serum uric acid values along with renal function and electrolyte levels. Then, similar determinations will be performed at days 30, 46 and 76.
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Serum uric acid levels after losartan treatment
Timeframe: 30 days