Nephrotoxicity of Vancomycin in Combination With Beta-Lactam Agents: Ceftolozane-Tazobactam vs Piperacillin-Tazobactam.

BACKGROUND: Vancomycin (VAN)-associated acute kidney injury (AKI) is increased when VAN is combined with certain beta-lactams (BLs) such as piperacillin-tazobactam (TZP) but has not been evaluated with ceftolozane-tazobactam (C/T). Our aim was to investigate the AKI incidence of VAN in combination with C/T (VAN/C/T) compared with VAN in combination to TZP (VAN-TZP). METHODS: We conducted a multicenter, observational, comparative study across the United States. The primary analysis was a composite outcome of AKI and risk, injury, failure, loss, end stage renal disease; Acute Kidney Injury Network; or VAN-induced nephrotoxicity according to the consensus guidelines. Multivariable logistic regression analysis was conducted to adjust for confounding variables and stratified Kaplan-Meir analysis to assess the time to nephrotoxicity between the 2 groups. RESULTS: We included VAN/C/T (n = 90) and VAN-TZP (n = 284) at an enrollment ratio of 3:1. The primary outcome occurred in 12.2% vs 25.0% in the VAN-C/T and VAN-TZP groups, respectively (P = .011). After adjusting for confounding variables, VAN-TZP was associated with increased odds of AKI compared with VAN-C/T; with an adjusted odds ratio of 3.308 (95% confidence interval, 1.560-6.993). Results of the stratified Kaplan-Meir analysis with log-rank time-to-nephrotoxicity analysis indicate that time to AKI was significantly shorter among patients who received VAN-TZP (P = .004). Cox proportional hazards analysis demonstrated that TZP was consistent with the primary analysis (P = .001). CONCLUSIONS: Collectively, our results suggest that the AKI is not likely to be related to tazobactam but rather to piperacillin, which is a component in VAN-TZP but not in VAN-C/T.

Impact of outpatient antimicrobial stewardship guideline implementation in an urgent care setting.

BACKGROUND: Urgent care medicine is a rapidly growing health care sector where patients are commonly treated for acute infectious diseases-related conditions. However, there are few antimicrobial stewardship interventions described in these settings. OBJECTIVE: The objective of this study is to determine whether implementing outpatient antimicrobial stewardship guidelines would improve antibiotic prescribing for acute upper respiratory tract infections (ARTIs), skin and soft tissue infections (SSTI), and urinary tract infections (UTI) at a single urgent care site. METHODS: This was a pre-post interventional study comparing antibiotic prescribing patterns for ARTI, SSTI, and UTI at a single urgent care site in the preintervention group (November 2019 to January 2020) with the postintervention group (November 2020 to January 2021) after implementation of outpatient stewardship guidelines. A second urgent care site that did not receive any interventions served as a control. The outpatient stewardship guidelines were implemented in October 2020 via didactic provider education and pocket guide distribution. The primary end point was the rate of total guideline-concordant antibiotic prescribing. Secondary end points included the rates of guideline concordance of each component of the prescription, including antibiotic selection, duration, dose, therapy indication, and patient safety outcomes. RESULTS: The primary outcome of total guideline-concordant antibiotic prescribing significantly improved after implementation of outpatient antimicrobial stewardship guidelines at the study site (50% vs. 70%, P < 0.001), which was also reflected when comparing postintervention study site with postperiod control site (70% vs. 48%, P < 0.001). There was a statistically significant improvement in guideline-concordant duration of antibiotic therapy (43% vs. 61%, P = 0.001), driven by a reduction in antibiotic duration for UTI (7 [interquartile range (IQR) 5-7] vs. 5 [IQR 5-7] days, P = 0.007), which was also observed when comparing the postintervention study site with the postperiod control site (61% vs. 48%, P = 0.02). Patient safety outcomes were similar between groups. CONCLUSION: An antimicrobial stewardship intervention comprising institutional outpatient guideline implementation and provider education significantly improved total guideline-concordant antibiotic prescribing by 20% for ARTI, UTI, and SSTI in an urgent care site.

Asymptomatic bacteriuria: Impact of an antimicrobial stewardship bundle to reduce unnecessary antibiotics in patients without urinary catheters.

PURPOSE: The purpose of this study was to evaluate the effect of an antimicrobial stewardship bundle on the management of asymptomatic bacteriuria (ASB). METHODS: In this quasi-experimental study, patients were selected by retrospective, consecutive sampling of patients with a positive urine culture report in 3 separate groups: preintervention, postdiagnostic intervention, and posteducation. Patients met the prespecified criteria for non-catheter-associated ASB. The diagnostic intervention involved a new urinalysis/urine culture ordering process in place of urinalysis with reflex to urine culture. Additionally, an educational intervention involved pharmacist-led sessions to educate providers with patient cases and guideline-based recommendations. The primary outcome of this study was the difference in the rate of inappropriate management of ASB, defined as the use of antimicrobial agents intended to treat ASB. Secondary outcomes included length of antimicrobial therapy, length of stay, and change in urine culture orders per 1,000 patient-days. RESULTS: A total of 120 patients were included. There was a significant reduction in the inappropriate management of ASB between the preintervention and postdiagnostic intervention groups (P = 0.0349). This was not seen when comparing the postdiagnostic intervention and posteducation groups (P = 0.93). Additionally, there was a significant difference in urinalysis/urine culture ordering between the preintervention and postdiagnostic intervention groups (370 vs 224 urinalysis orders per 1,000 days present, P < 0.0001; 131 vs 54 urine culture orders per 1,000 days present, P < 0.0001). CONCLUSION: An antimicrobial stewardship bundle involving a diagnostic stewardship intervention and pharmacist-led education reduced treatment of ASB in patients without urinary catheters.