1422. Sustained Reductions in Total Antibiotic Use Outside of Critical Care Setting after Initiation of an Antimicrobial Stewardship Program Targeting All Systemic Antimicrobials
Session: Poster Abstract Session: Antimicrobial Stewardship: Interventions
Saturday, October 10, 2015
Room: Poster Hall

Background: Antimicrobial overuse promotes the development of antibiotic resistant infections and leads to adverse patient outcomes. Antimicrobial Stewardship Programs (ASPs) have been widely implemented to promote judicious antimicrobial use. The bulk of the available literature evaluating the efficacy of ASPs has focused on Intensive Care Units (ICUs) or ASPs targeting broad-spectrum antimicrobials only. We sought to evaluate the impact of an ASP in non-ICU settings where all antimicrobials, regardless of spectrum, were targeted at the time of initiation.

Methods: Antimicrobial stewardship was initiated on the surgical, respiratory, and medical wards of a community hospital on July 1, 2010, October 1, 2010, and April 1, 2012, respectively. From Monday to Friday, the ASP team carried out prospective audit and feedback on all patients on any systemic antimicrobial. We evaluated rates of antimicrobial use, measured in Days of Therapy (DOTs), among patients admitted to the wards before and after ASP initiation using an interrupted time series analysis. Changes in mean rates of mortality, readmission, length of stay, and C. difficile infection (CDI) were evaluated on each ward using univariate analysis.

Results: On the surgical ward, antimicrobial use decreased from a mean value of 826.4 prior to ASP, to 726.6 after ASP (DOTs/1000 patient care days), representing a 12% reduction (p=0.05). On the respiratory ward, antimicrobial use was reduced from a mean value of 1022.5 before ASP, to 922.4 after ASP (DOTs/1000 patient care days), representing a 10% decrease (p=0.03). On the medical ward, antimicrobial use decreased from a mean value of 459.8 prior to ASP, to 369.1 after ASP, representing a 20% reduction (p<0.01). Reductions in antimicrobial use were sustained over time. Most patient outcomes did not change significantly post intervention, however CDI rates showed a non-significant declining trend.

Conclusion: Antimicrobial Stewardship Programs can lead to sustained reductions in total antimicrobial use outside of the critical care setting when interventions are not limited to broad-spectrum antibiotics. ASP programs outside of critical care units should target all antimicrobials, not only broad-spectrum agents.

Tonya Campbell, HBSc1, Suzanne Gill, BscPhm1, Grace Ho, BscPhm, ACPR1, Janine Mccready, MD, FRCPC1,2 and Jeff Powis, MD, MSc, FRCPC1,2, (1)Toronto East General Hospital, Toronto, ON, Canada, (2)Department of Medicine, University of Toronto, Toronto, ON, Canada


T. Campbell, None

S. Gill, None

G. Ho, None

J. Mccready, None

J. Powis, None

Findings in the abstracts are embargoed until 12:01 a.m. PDT, Wednesday Oct. 7th with the exception of research findings presented at the IDWeek press conferences.