769. Center-level variability in broad-spectrum antibiotic prescribing for children undergoing hematopoietic cell transplantion for acute leukemia.
Session: Poster Abstract Session: Stewardship: Program Implementation
Thursday, October 5, 2017
Room: Poster Hall CD
  • IDSA_Poster.pdf (295.9 kB)
  • Background:

    Antibiotic exposure after allogeneic hematopoietic cell transplant (HCT) is common. Exposure to specific classes of antibiotics after HCT has been associated with mortality, relapse and graft-versus-host disease. Exploring differences in antibiotic utilization across hospitals could provide opportunities for comparative effectiveness studies and quality improvement interventions.


    We conducted a retrospective cohort study of patients undergoing HCT for acute leukemia using a dataset merged from two sources: the Pediatric Health Information System and the Center for International Blood and Marrow Transplant Research. Medication use data were obtained from the day of transplant through engraftment. Hospital antibiotic utilization rates were reported as antibiotic days/1000 neutropenic days. Adjusted rates were calculated using a poisson regression controlling for age, sex, race, graft characteristics and days of ICU-level care.


    After adjustment, hospital rates of anti-pseudomonal antibiotic use varied from 410 to 1037 antibiotic days/1000 neutropenic days (figure 1A) and for gram positive antibiotic use from 109 to 771 antibiotic days/1000 neutropenic days (figure 1B). As shown in figure 1, within anti-pseudomonal antibiotics, there was variation by hospital in the use of 4th and 5th generation cephalosporins, anti-pseudomonal penicillins and carbapenems; variation in gram positive exposure was driven by vancomycin. Gram positive antibiotic use was moderately associated with days of ICU-level of care (spearman correlation coefficient  = .55) but anti-pseudomonal antibiotic use was not (figure 2). There was no association between days of antibiotic exposure and 30-day mortality.


    Among a homogenous population of children undergoing transplantation for acute leukemia, both the volume and spectrum of antibiotic exposure in the immediate post-transplant period varied widely. These data present an opportunity for hospitals to benchmark their antibiotic utilization practices and can be further leveraged to assess the clinical impact of differential antibiotic exposure.

    Caitlin Elgarten, MD1,2, Staci Arnold, MD, MBA, MPH3, Yimei Li, PhD4, Y. Vera Huang, MS4, Jeffrey S. Gerber, MD, PhD2,5,6, Wael Saber, MD, MS7, Richard Aplenc, MD, PhD1,2 and Brian T. Fisher, DO, MSCE, MPH2,6,8, (1)Department of Pediatrics, Division of Oncology, The Children's Hospital of Philadelphia, Philadelphia, PA, (2)Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, (3)Department of Oncology, Aflac Cancer and Blood Disorders Center, Children’s Hospital of Atlanta, Emory University, Atlanta, GA, (4)Center for Pediatric Clinical Effectiveness, The Children's Hospital of Philadelphia, Philadelphia, PA, (5)Department of Pediatrics, Division of Infectious Diseases, The Children's Hospital of Philadelphia, Philadelphia, PA, (6)Center for Pediatric Clinical Effectiveness, Pediatric Infectious Diseases Epidemiology and Antimicrobial Stewardship Research Group, The Children's Hospital of Philadelphia, Philadelphia, PA, (7)Center for International Blood and Marrow Transplant Research, Milwaukee, WI, (8)Department of Pediatrics, Division of Infectious Diseases, The Children’s Hospital of Philadelphia, Philadelphia, PA


    C. Elgarten, None

    S. Arnold, None

    Y. Li, None

    Y. V. Huang, None

    J. S. Gerber, None

    W. Saber, None

    R. Aplenc, None

    B. T. Fisher, Pfizer, Inc.: Grant Investigator , Research support
    Merck, Inc.: Investigator , Research support
    T2 Biosystems, Inc.: Investigator , Research support
    Ansun Biopharma: Investigator , Research support

    Findings in the abstracts are embargoed until 12:01 a.m. PDT, Wednesday Oct. 4th with the exception of research findings presented at the IDWeek press conferences.