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Characterizing Multidrug Efflux Systems in Acinetobacter baumannii Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System
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Multidrug-resistant Pseudomonas aeruginosa and Acinetobacter baumannii: resistance mechanisms and implications for

Alexandre P Zavascki1, Cecília G Carvalhaes, Renata C Picão

  • 1Infectious Diseases Unit, Hospital de Clínicas de Porto Alegre, 2350 Ramiro Barcelos Street, 90035-903, Porto Alegre, Brazil. azavascki@hcpa.ufrgs.br

Expert Review of Anti-Infective Therapy
|December 18, 2009
PubMed

Insights

Multidrug-resistant (MDR) Pseudomonas aeruginosa and Acinetobacter baumannii pose significant treatment challenges due to diverse resistance mechanisms. This review details these mechanisms and their impact on antimicrobial therapy.

Area of Science:

  • Clinical Microbiology
  • Infectious Diseases
  • Pharmacology

Background:

  • Pseudomonas aeruginosa and Acinetobacter baumannii are leading causes of hospital-acquired infections globally.
  • These pathogens exhibit intrinsic and acquired resistance to numerous antimicrobial agents.
  • The increasing prevalence of multidrug-resistant (MDR) strains complicates treatment strategies.

Purpose of the Study:

  • To review the primary resistance mechanisms employed by P. aeruginosa and A. baumannii.
  • To discuss the clinical, microbiological, pharmacokinetic, and pharmacodynamic implications of these resistance mechanisms.
  • To highlight challenges in treating infections caused by MDR isolates.

Main Methods:

  • Literature review of resistance mechanisms in P. aeruginosa and A. baumannii.
  • Analysis of clinical, microbiological, pharmacokinetic, and pharmacodynamic data for relevant antimicrobial drugs.
  • Synthesis of information on the impact of resistance on therapeutic outcomes.

Main Results:

  • Key resistance mechanisms include beta-lactamase production, efflux pumps, and alterations in drug targets or outer membranes.
  • MDR is often due to combined mechanisms or single potent ones.
  • Limited new antimicrobial development exacerbates treatment challenges.

Conclusions:

  • Understanding resistance mechanisms is crucial for effective antimicrobial therapy against MDR P. aeruginosa and A. baumannii.
  • Current treatment options face significant hurdles due to evolving resistance.
  • Further research and development of novel antimicrobials are urgently needed.

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