Creatinine clearance and microalbuminuria were measured before and after an oral protein load in 17 children with a history of haemolytic uraemic syndrome, 11 with a single kidney, and 15 controls, all of them normotensive and without evidence of renal damage, to look for indirect evidence of glomerular hyperfiltration. While creatinine clearance increased significantly after the protein load in controls, it did not change in patients with either haemolytic uraemic syndrome or a single kidney. Basal microalbuminuria was significantly higher in those with haemolytic uraemic syndrome when compared with those with a single kidney and controls. It increased significantly in all groups after a water load; this increase was significantly higher in haemolytic uraemic syndrome. After the protein load microalbuminuria returned to baseline. In conclusion, children with a history of haemolytic uraemic syndrome have an abnormal renal functional reserve like children with a single kidney. Only patients with haemolytic uraemic syndrome exhibited an increased microalbuminuria, however, suggesting that it may be the expression of a pathophysiological mechanism involved in haemolytic uraemic syndrome and not in single kidney, that could account for their different prognosis.
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