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Empirical Antimicrobial Therapy for Bloodstream Infection Due to Methicillin-Resistant Staphylococcus aureus: No Better than a Coin Toss

Published online by Cambridge University Press:  02 January 2015

Carrie A. Herzke ,
Luke F. Chen ,
Deverick J. Anderson ,
Yong Choi ,
Daniel J. Sexton  and
Keith S. Kaye
Carrie A. Herzke*
Affiliation:
Johns Hopkins University Medical Institute, Baltimore, Maryland
Luke F. Chen
Affiliation:
Duke University Medical Center, Durham, North Carolina
Deverick J. Anderson
Affiliation:
Duke University Medical Center, Durham, North Carolina
Yong Choi
Affiliation:
Duke University Medical Center, Durham, North Carolina
Daniel J. Sexton
Affiliation:
Duke University Medical Center, Durham, North Carolina
Keith S. Kaye
Affiliation:
Wayne State University Medical Center, Detroit, Michigan
*
Johns Hopkins Medical Institute, 600 North Wolfe Street, Park 307, Baltimore, MD 21287 (cherzkel@jhmi.edu)
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Abstract

Background.

Despite the high prevalence of methicillin-resistant Staphylococcus aureus (MRSA) infection in the hospital, the proportion of patients with MRSA bacteremia who receive appropriate empirical therapy remains suboptimal.

Objective.

To investigate the proportion of patients with MRSA bloodstream infection (BSI) who received appropriate empirical antibiotic therapy and to identify risk factors associated with receipt of appropriate empirical therapy.

Methods.

We studied a cohort of patients from 10 hospitals. The primary outcome was the proportion of patients who received appropriate empirical antibiotic therapy for MRSA BSI. Appropriate therapy was defined as receipt of daptomycin, linezolid, quinupristin-dalfopristin, or vancomycin within 1 calendar day after the first blood culture result positive for S. aureus (ie, before antimicrobial susceptibilities were known). Multivariable logistic regression was used to determine variables associated with receipt of appropriate empirical therapy.

Results.

The study included 562 patients with MRSA BSI. The mean (± standard deviation) age of the patients was 64 ± 16 years, and 288 (51.2%) were male. Only 291 (51.8%) patients received appropriate empirical therapy. Patients were more likely to receive appropriate therapy if they required hemodialysis (odds ratio [OR], 1.36 [95% confidence interval {CI}, 1.00–1.85]), had undergone knee or hip arthroplasty (OR, 3.04 [95% CI, 1.21–7.6]), had a central venous catheter at admission (OR, 1.72 [95% CI, 1.01–2.93]), or had a McCabe score of 1 at admission (OR, 1.83 [95% CI, 1.16–2.83]). Bowel incontinence (OR, 0.41 [95% CI, 0.19–0.92]) and BSIs categorized as primary (OR, 0.41 [95% CI, 0.27–0.63]) were associated with a decreased likelihood of receiving appropriate empirical therapy.

Conclusions.

Only half of patients with MRSA BSI received appropriate empirical therapy. Factors associated with receiving appropriate empirical antibiotics included the presence of a central venous catheter at admission and a history of joint arthroplasty. Surprisingly, prior MRSA infection was not predictive of receipt of appropriate antimicrobial therapy.

Type
Original Articles
Information
Infection Control & Hospital Epidemiology , Volume 30 , Issue 11 , November 2009 , pp. 1057 - 1061
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2009

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