Hypothesis: Administration of corticoids (dexamethasone) together with the conventional antibiotherapy in the acute phase of a febrile urinary tract infection could reduce the risk of renal scarring after 6 months of the primo-infection. Primary objectives:To evaluate the reduction in incidence of renal scarring after 6 months of a acute pyelonephritis between the control group (conventional therapy plus placebo) and intervention group (conventional therapy plus dexamethasone. Design: Multicentre randomized clinical trial,placebo controled, including children between 2 months and 14 years with a acute pyelonephritis proven by a acute phase DMSA (dimethylsuccinic acid ). A total of 180 children in to parallel groups (intervention and placebo) will be included.
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renal scarring
Timeframe: 6 month after the acute pyelonephritis episode