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Updated: May 31, 2026

Use of Artificial Sputum Medium to Test Antibiotic Efficacy Against Pseudomonas aeruginosa in Conditions More Relevant to the Cystic Fibrosis Lung
07:46

Use of Artificial Sputum Medium to Test Antibiotic Efficacy Against Pseudomonas aeruginosa in Conditions More Relevant to the Cystic Fibrosis Lung

Published on: June 5, 2012

Cefepime-resistant Pseudomonas aeruginosa

Ehimare Akhabue1, Marie Synnestvedt, Mark G Weiner

  • 1University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA.

Emerging Infectious Diseases
|July 14, 2011
PubMed

Insights

Prior antibiotic use and transfers increase the risk of cefepime-resistant Pseudomonas aeruginosa infections. This resistance is linked to higher mortality, especially when bloodstream infections occur.

Area of Science:

  • Infectious Diseases
  • Clinical Microbiology
  • Epidemiology

Background:

  • Extended-spectrum cephalosporin resistance in Pseudomonas aeruginosa poses significant treatment challenges.
  • Understanding risk factors for cefepime resistance is crucial for effective patient management.

Purpose of the Study:

  • To identify risk factors associated with cefepime-resistant Pseudomonas aeruginosa (CRPA).
  • To determine the association between CRPA and patient mortality.

Main Methods:

  • A case-control study was conducted involving 2,529 hospitalized patients from 2001-2006.
  • Data analysis identified independent risk factors and mortality associations.

Main Results:

  • 8.4% of patients had CRPA infections.
  • Independent risk factors included prior use of extended-spectrum cephalosporins, extended-spectrum penicillins, quinolones, and transfer from outside facilities.
  • Mortality rates were higher in patients with CRPA (20.2%) compared to cefepime-susceptible P. aeruginosa (13.2%) among those hospitalized for at least 30 days.

Conclusions:

  • Prior antibiotic exposure and inter-facility transfer are key risk factors for CRPA.
  • CRPA is an independent risk factor for death, particularly in cases of bloodstream infection.
  • Optimizing the use of antipseudomonal drugs is essential to mitigate the emergence of CRPA.

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