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In vitro interaction of various antibiotic combinations recommended by Chinese consensus statement against

W Ma1, J Li2, D Wang3

  • 1School of Pharmaceutical Sciences, Shandong University, Jinan, Shandong Province, China.

Letters in Applied Microbiology
|June 26, 2019
PubMed

Insights

This study investigated antibiotic combinations against carbapenem-resistant Pseudomonas aeruginosa (CRPA). Ceftazidime with cefoperazone-sulbactam showed 100% synergy, offering a promising treatment option for these difficult-to-treat infections.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Pharmacology

Background:

  • Pseudomonas aeruginosa is a significant cause of nosocomial infections, often developing antimicrobial resistance.
  • Carbapenem resistance in P. aeruginosa (CRPA) presents a major clinical challenge due to high mortality and treatment costs.
  • Existing treatment guidelines for extensively drug-resistant Gram-negative bacilli (XDR-GNB) include recommendations for CRPA.

Purpose of the Study:

  • To evaluate the in vitro antibacterial activities of various antibiotic combinations against carbapenem-resistant P. aeruginosa (CRPA) strains.
  • To identify effective synergistic antibiotic combinations for treating CRPA infections.
  • To compare the efficacy of antibiotic combinations against CRPA with monotherapy.

Main Methods:

  • In vitro testing of antibiotic combinations against six carbapenem-resistant P. aeruginosa (CRPA) strains.
  • Determination of synergistic effects and reduction in minimum inhibitory concentrations (MICs).
  • Evaluation of combinations recommended by a Chinese expert consensus statement.

Main Results:

  • The combination of ceftazidime and cefoperazone-sulbactam demonstrated excellent synergistic activity with a 100% synergistic rate.
  • Other combinations, such as ceftazidime/piperacillin-tazobactam and ceftazidime/aztreonam, showed improved efficacy compared to monotherapy.
  • Some antibiotic combinations exhibited no additional or synergistic effects, highlighting variability in effectiveness.

Conclusions:

  • Ceftazidime combined with cefoperazone-sulbactam is a highly effective synergistic combination against CRPA strains.
  • Not all antibiotic combinations recommended by guidelines are equally effective against resistant P. aeruginosa.
  • These findings provide evidence for effective antibiotic combinations that may help combat the spread of antibiotic resistance.
Keywords:
Pseudomonas aeruginosaChinese consensusantibioticsantimicrobial synergydrug-resistant Carbapenems

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