[Acute pyelonephritis].

The initial management of pyelonephritis needs to look for complicating factors. Ultrasound and X ray of the abdomen are able to rule out a urinary dilatation or a stone. The treatment is then surgical with renal drainage. Additional investigations such as a CT scan should be performed in patients with complicating factors or recurrence. In uncomplicated pyelonephritis a ambulatory treatment with 2 weeks of fluoroquinolones or cephalosporine Gr3 is sufficient. More severe cases should be admitted to a hospital and treated with initial cephalosporin Gr 3 plus aminoside for 3 to 6 weeks.