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Background Concomitant use of vancomycin (V) and piperacillin-tazobactam (PT) is associated with increased incidence of acute kidney injury (AKI). AKI develops 3 times faster on this combination compared to alternative vancomycin combinations. We sought to reduce AKI in our patients by reducing concomitant use of V/PT using a QI framework. Methods We implemented several PDSA cycles to reduce concomitant V/PT use at a 415-bed quaternary children’s hospital in Boston, MA. Interventions included substitution of PT with other agents in surgical prophylaxis guidelines and order sets starting in February 2020 and in the hospital-wide sepsis order set in March 2021. The Antimicrobial Stewardship Program reinforced these changes during daily audit-and-feedback reviews. In November 2020, we implemented an electronic alert that apprises clinicians of the AKI risk when V/PT are ordered and recommends an alternative regimen. We measured the monthly number of patients on combination V/PT, new exposures to nephrotoxic medications, AKI events, and the percentage of days with serum creatinine monitoring for patients on ≥2 nephrotoxic medications. Results From 02/01/20 to 05/31/21, the number of patients exposed to combination V/PT decreased from 23 to 6 per month (Figure 1). New nephrotoxic medication exposures declined from 17.1 to 7.7 per 1,000 patient days, and AKI events dropped from 2.8 to 0.6 per 1,000 patient days (Figures 2 and 3). The percentage of days with serum creatinine monitoring increased from 60% to 66%. Rate of New Exposures to Nephrotoxic Medications per 1000 Patient Days Conclusion Revising guidelines and electronic order sets and implementing an order alert led to marked decreases in exposures to V/PT and nephrotoxic medications overall and was associated with reduced AKI events. Use of electronic health record tools is an effective way to drive safer antimicrobial use. Disclosures Gabriella S. Lamb, MD, MPH, Nothing to disclose

1125. Decreasing Concomitant Vancomycin and Piperacillin-Tazobactam Use in Children to Reduce Incidence of Acute Kidney Injury