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Association between Vancomycin-Resistant Enterococci Bacteremia and Ceftriaxone Usage

Published online by Cambridge University Press:  02 January 2015

James A. McKinnell ,
Danielle F. Kunz ,
Eric Chamot ,
Mukesh Patel ,
Rhett M. Shirley ,
Stephen A. Moser ,
John W. Baddley ,
Peter G. Pappas  and
Loren G. Miller
James A. McKinnell*
Affiliation:
Infectious Disease Clinical Outcomes Research Unit, Division of Infectious Disease, Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, Torrance, California Torrance Memorial Medical Center, Torrance, California
Danielle F. Kunz
Affiliation:
Department of Pharmacy, University of Alabama at Birmingham, Alabama
Eric Chamot
Affiliation:
School of Public Health, University of Alabama at Birmingham, Alabama
Mukesh Patel
Affiliation:
Division of Infectious Diseases, University of Alabama at Birmingham, Alabama Birmingham Veterans Administration Medical Center, Birmingham, Alabama
Rhett M. Shirley
Affiliation:
Division of Infectious Diseases, University of Alabama at Birmingham, Alabama
Stephen A. Moser
Affiliation:
Department of Pathology, University of Alabama at Birmingham, Alabama
John W. Baddley
Affiliation:
Division of Infectious Diseases, University of Alabama at Birmingham, Alabama Birmingham Veterans Administration Medical Center, Birmingham, Alabama
Peter G. Pappas
Affiliation:
Division of Infectious Diseases, University of Alabama at Birmingham, Alabama
Loren G. Miller
Affiliation:
Infectious Disease Clinical Outcomes Research Unit, Division of Infectious Disease, Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, Torrance, California
*
Infectious Disease Clinical Outcomes Research Unit, 1124 West Carson Street, Box 466, Torrance, CA 90502 ([email protected])
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Abstract

Objective.

Vancomycin-resistant enterococci (VRE) have become a public health concern with implications for patient mortality and costs. Hospital antibiotic usage may impact VRE incidence, but the relationship is poorly understood. Animal investigations suggest that ceftriaxone may be associated with VRE proliferation. We measured antimicrobial usage and VRE bloodstream infection (VRE-BSI) incidence to test our hypothesis that increased ceftriaxone usage would be associated with a higher incidence of VRE-BSI.

Design.

Retrospective cohort study.

Setting.

University of Alabama at Birmingham Medical Center, a 900-bed urban tertiary care hospital.

Participants.

All patients admitted during the study period contributed data.

Methods.

We conducted a retrospective analysis of antimicrobial usage and VRE-BSI from 2005 to 2008 (43 months). Antimicrobial usage was quantified as days of therapy (DOTs) per 1,000 patient-days. VRE-BSI incidence was calculated as cases per 1,000 patient-days. Negative binomial regression with adjustment for correlation between consecutive observations was used to measure the association between antimicrobial usage and VRE-BSI incidence at the hospital- and care-unit levels.

Results.

VRE-BSI incidence increased from 0.06 to 0.17 infections per 1,000 patient-days. Hospital VRE-BSI incidence was associated with prior-month ceftriaxone DOTs (incidence rate ratio, 1.38 per 10 DOTs; P = .005). After controlling for ceftriaxone, prior-month cephalosporin usage (class) was not predictive of VRE-BSI (P = .70). Similarly, prior-month usage of piperacillin-tazobactam, ceftazidime, cefepime, cefazolin, or vancomycin was not predictive of VRE-BSI when considered individually (P ≥ .4 for all comparisons). The final model suggests that type of intensive care unit was related to VRE-BSI incidence.

Conclusions.

Ceftriaxone usage in the prior month, but not cephalosporin (class) or vancomycin usage, was related to VRE-BSI incidence. These findings suggest that an antimicrobial stewardship program that limits ceftriaxone may reduce nosocomial VRE-BSI incidence.

Type
Original Articles
Information
Infection Control & Hospital Epidemiology , Volume 33 , Issue 7 , July 2012 , pp. 718 - 724
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2012

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