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Background Complicated urinary tract infection (cUTI) is common among hospitalized patients. Though carbapenems are an effective treatment in the face of rising resistance, overuse drives carbapenem resistance (CR). We hypothesized that resistance to routinely used antimicrobials is common, and, despite the frequent use of carbapenems, associated with an increased risk of inappropriate empiric treatment (IET), which in turn worsens clinical outcomes. Methods We performed a multicenter retrospective cohort study in ~180 hospitals in the Premier database, 2013–2018. Using an ICD-9/10-based algorithm we identified all adult patients hospitalized with cUTI and a positive blood or urine culture (CR excluded). We examined with the impact of triple resistance (TR; resistance to &gt;3 of the following drugs/classes: third-generation cephalosporin [C3R], fluoroquinolones, trimethoprim-sulfamethoxazole, fosfomycin, and nitrofurantoin), on the risk of receiving IET. We derived multivariate models to compute the impact of IET on hospital outcomes. Results Among 23,331 patients with cUTI (96.2% community-onset), 3,040 (13.0%) had a TR pathogen. Compared with those with non-TR, patients with TR were more likely male (57.6% vs. 47.7%), black (17.9% vs. 13.6%), and in the South (46.3% vs. 41.5%), P &lt; 0.001 each; had a higher median Charlson score (3 vs. 2), and were more likely to need early ICU (22.3% vs. 18.6%) and mechanical ventilation (7.0% vs. 5.0%), P &lt; 0.001 each. Patients with TR were hospitalized at centers with higher median prevalence of both C3R (16.3% vs. 14.4%) and TR (15.1% vs. 12.2%), P &lt; 0.001 each. IET was more frequent in TR than non-TR group (19.6% vs. 5.4%) despite greater empiric carbapenem use in TP (43.3% vs. 16.2%), P &lt; 0.001 each. Though IET did not have an impact on adjusted hospital mortality or 30-day readmission rate, it was associated with excess adjusted resource utilization ($1,364 in costs and 0.66 day in length of stay). Conclusion Among hospitalized patients with cUTI, TR is common, and is associated with a nearly 4-fold increase in exposure to IET, which in turn contributes to excess resource utilization. Given the high prevalence of TR, clinicians should consider a lower threshold for broader empiric treatment in appropriate patients. Disclosures All authors: No reported disclosures.

open forum infectious diseases

1455. Epidemiology, Empiric Treatment, and Outcomes Among Hospitalized Patients With Complicated Urinary Tract Infections in the United States, 2013–2018