Antibiotic Appropriateness for Urinary Tract Infections in Children.

Objectives: We examined local prescribing patterns across the entire treatment course for children treated for uncomplicated urinary tract infection (UTI) to determine opportunities for antibiotic stewardship initiatives.

Methods: We conducted a retrospective review of emergency department and inpatient encounters for febrile and afebrile UTI in a children's hospital from 2021 to 2022. An antibiotic spectrum ranking was established, and providers' choices were assessed for appropriateness on the basis of the individuals' urine culture (UCx). Groups were stratified by fever presence and compared using χ2, Fisher's exact, and Mann-Whitney U tests.

Results: Of 172 encounters (83% emergency department), 99 (58%) had a positive UCx. Eighty (80%) grew Escherichia coli, with 67 (84%) being susceptible to cefazolin (minimum inhibitory concentration ≤16 mg/L). There were 229 antibiotic regimens and 39 (17%) were appropriate. Inappropriate antibiotic choices included unnecessary use of broad-spectrum antibiotics and misdiagnosed UTI. Grouping by encounter, at least 1 dose of a third cephalosporin was given in 51% of encounters, and 80% of these received it unnecessarily because of UTI misdiagnosis or suitability of a narrower-spectrum antibiotic. The median prescribed antibiotic duration was 7 days (interquartile range 7-10). Of 73 encounters with UCx growing mixed flora or a nonuropathogen, only 29 (40%) had antibiotics discontinued. Confirmed UTI was associated with fever and nitrite positivity.

Conclusions: Our study revealed high prevalence of inappropriate antibiotics, particularly unnecessary prescribing of third cephalosporin, prescriptions not supported by laboratory data, and prolonged treatment courses. Our results identify factors that can be used to support UTI treatment pathways and ensure antibiotic stewardship.