Purpose
The American Academy of Pediatrics no longer recommends a voiding cystourethrogram (VCUG) for children aged 2 to 24 months presenting with their first urinary tract infection (UTI) if renal-bladder ultrasound (RBUS) is normal. Our goal was to identify factors associated with abnormal imaging and recurrent pyelonephritis for this population.
Materials and Methods
We retrospectively evaluated children diagnosed with first episode of pyelonephritis between 2 to 24 months using de-identified electronic medical record data from an institutional database. Data included age at first UTI, gender, race/ethnicity, need for hospitalization, intravenous antibiotic use, history of abnormal prenatal ultrasound, RBUS and VCUG results, UTI recurrence and surgical intervention. Risk factors for abnormal imaging and UTI recurrence were analyzed with univariate logistic regression, chi square and survival analysis.
Results
We identified 174 patients. Of 154 RBUS performed, 59 (38%) were abnormal. Abnormal prenatal ultrasound (p=0.01) and need for hospitalization (p=0.02) predicted abnormal RBUS. Of the 95 patients with normal RBUS, 84 had a VCUG. Vesicoureteral reflux was more likely in Caucasians (p=0.003), females (p=0.02) and older patients (p=0.04). Despite normal RBUS, 23 of 84 (24%) patients had dilating vesicoureteral reflux. Of the 95 patients with normal RBUS, 14 (15%) had recurrent pyelonephritis and 7 (7%) went on to surgical intervention.
Conclusions
Despite a normal RBUS after first episode of pyelonephritis, a child may still have vesicoureteral reflux, recurrent pyelonephritis, and need for surgical intervention. If VCUG is deferred, parents should be counseled regarding these risks.