Impact of removing ESBL status labelling from culture reports on the use of carbapenems for non-bacteraemic patients diagnosed with ESBL-positive urinary tract infections

Abstract

Abstract Objectives To evaluate carbapenem prescribing rates for initial definitive treatment of urinary tract infections and clinical outcomes before and after removing ESBL status labels on antibiotic susceptibility reports. Methods This was a retrospective cohort study of adult patients treated for at least 48 h for an ESBL-producing/ceftriaxone-resistant Enterobacterales urinary tract infection. ESBL status reporting ceased in September 2022 for a network of seven community hospitals within the USA. The primary endpoint was the rate of carbapenem prescribing for initial definitive treatment of urinary tract infections. Secondary endpoints included total days of therapy for initial definitive treatment with carbapenems, clinical cure rates, time to transition to oral antibiotic therapy for initial definitive treatment, rate of guideline-compliant therapy, rate of relapsed infection within 30 days, 30 day readmission rate, and 30 day all-cause in-hospital mortality. Results Of 3055 patients screened, 199 were included in the pre group and 153 were included in the post group. The rate of carbapenem prescribing for initial definitive treatment was 156 patients (78%) in the pre group, compared with 93 patients (61%) in the post group (P = <0.01). Days of therapy for initial definitive therapy with carbapenem was 620 in the pre group compared with 372 in the post group (P < 0.01). There was no difference between other secondary outcomes. Conclusions Removing ESBL status labels from laboratory reports reduced carbapenem use for initial definitive treatment of urinary tract infections from 78% to 61% (P < 0.01) without impacting clinical outcomes.