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Optimization of therapy against Pseudomonas aeruginosa with ceftazidime and meropenem using chemostats as model for

Yanfang Feng1, Roosmarijn T Bakker, Reinier M van Hest2

  • 1Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute of Life Sciences, University of Amsterdam, 1098 XH Amsterdam, the Netherlands.

FEMS Microbiology Letters
|September 1, 2017
PubMed

Insights

To combat Pseudomonas aeruginosa infections, combination or alternating therapies with ceftazidime and meropenem are most effective. These strategies reduce bacterial load and limit antibiotic resistance development in intensive care units.

Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Pharmacology

Background:

  • Pseudomonas aeruginosa is a critical opportunistic pathogen in intensive care units.
  • Ceftazidime and meropenem are primary treatments, but rapid resistance development is a major challenge.

Purpose of the Study:

  • To compare various therapeutic protocols for reducing Pseudomonas aeruginosa viable cells.
  • To evaluate the development of antibiotic resistance under different treatment strategies.

Main Methods:

  • Simulated patient therapy using chemostat cultures exposed to varying concentrations (low, medium, high) of ceftazidime and meropenem.
  • Assessed bacterial recovery times and resistance levels for monotherapy, fluctuating, intermittent, alternating, and combination therapies.

Main Results:

  • Monotherapy with ceftazidime or meropenem led to rapid resistance development, with longer recovery times at higher concentrations.
  • Alternating and combination therapies significantly reduced bacterial cell numbers compared to monotherapy.
  • Combination and alternating treatments strongly limited the development of antibiotic resistance.

Conclusions:

  • Combination or alternating administration of ceftazidime and meropenem is superior for managing Pseudomonas aeruginosa infections.
  • Highest tolerable drug concentrations and shortest effective treatment durations are recommended, especially for monotherapy.
  • Optimized therapeutic strategies are crucial for minimizing resistance in clinical settings.
Keywords:
alternating therapyantibioticsantimicrobial resistancecombination therapyprotocoltreatment regimen

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