Background
Reducing antibiotic use in patients with asymptomatic bacteriuria (ASB) has been inpatient focused. However, testing and treatment is often started in the emergency department (ED). Thus, for hospitalized patients with ASB, we sought to identify patterns of testing and treatment initiated by EM clinicians and the association of treatment with outcomes.
Methods
We conducted a 43-hospital, cohort study of adults admitted through the emergency department (ED) with ASB (2/2018-2/2020). Using generalized estimating equation models, we assessed a) for factors associated with antibiotic treatment by EM clinicians and, after inverse probability of treatment weighting, b) the effect of treatment on outcomes.
Results
Of 2461 patients with ASB, 74.4% (N=1830) received antibiotics. EM clinicians ordered urine cultures in 80.0% (N=1970) of patients and initiated treatment in 68.5% (1253/1830). Predictors of EM clinician treatment of ASB vs. no treatment included dementia, spinal cord injury, incontinence, urinary catheter, altered mental status, leukocytosis, and abnormal urinalysis. Once initiated by EM clinicians, 79% (993/1253) of patients remained on antibiotics for at least 3 days. Antibiotic treatment was associated with a longer length of hospitalization (mean 5.1 vs 4.2 days; RR 1.16; 95% CI, 1.08-1.23) and Clostridioides difficile infection (CDI) (0.9% (N=11) vs. 0% (N=0); P=0.02).
Conclusions
Among hospitalized patients ultimately diagnosed with ASB, EM clinicians commonly initiated testing and treatment; most antibiotics were continued by inpatient clinicians. Antibiotic treatment was not associated with improved outcomes, whereas it was associated with prolonged hospitalization and CDI. For best impact, stewardship interventions must expand to the ED.