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Enterococcal Bacteremia: Risk Factors for Vancomycin Resistance and Predictors of Mortality

Published online by Cambridge University Press:  02 January 2015

Ebbing Lautenbach ,
Warren B. Bilker  and
Patrick J. Brennan
Ebbing Lautenbach
Affiliation:
Infectious Diseases Division, Department of Internal Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
Warren B. Bilker
Affiliation:
Department of Biostatistics and Epidemiology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
Patrick J. Brennan*
Affiliation:
Infectious Diseases Division, Department of Internal Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
*
Infectious Diseases Division, 9 Gates Blag, Hospital of the University of Pennsylvania, 3400 Spruce St, Philadelphia, PA 19104
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Abstract

Objective:

To identify risk factors for vancomycin resistance and mortality in enterococcal bacteremia.

Design:

Historical cohort study.

Setting:

A large academic medical center with a high prevalence of vancomycin-resistant enterococci (VRE).

Patients:

Two hundred sixty patients with enterococcal bacteremia, of whom 72 (28%) had VRE.

Results:

Independent risk factors for infection with VRE were the mean number of antibiotic days (P<.001), renal insufficiency (P<.001), mean days of vancomycin use (P=.005), and neutropenia (P=.013). A trend toward a significant association between metronidazole use and VRE also was noted (P=.068). Mortality was attributable to the bacteremia in 96 patients (37%). Severity of illness (P<.001) and age (P=.020) were independent risk factors for mortality. Vancomycin resistance was not, however, an independent predictor of mortality.

Conclusion:

These results suggest that restrictions on antibiotic use, particularly in patients with renal insufficiency and neutropenia, may help to combat the rising incidence of VRE. Although patients with VRE bacteremia demonstrated higher mortality rates than patients with infection due to susceptible isolates, vancomycin resistance was not an independent predictor of mortality in these patients and likely serves more as a marker of underlying severity of illness.

Type
Orginal Articles
Information
Infection Control & Hospital Epidemiology , Volume 20 , Issue 5 , May 1999 , pp. 318 - 323
Copyright
Copyright © The Society for Healthcare Epidemiology of America 1999

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