What question did this study set out to answer?

This research aims to characterize AmpC-type beta-lactamases in Pseudomonas aeruginosa isolates with antibiotic resistance.

Extended-Spectrum Cephalosporinases in Pseudomonas aeruginosa

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Randomized trial demonstrates imipenem resistance in Pseudomonas aeruginosa, indicating a new resistance mechanism.

This research aims to characterize AmpC-type beta-lactamases in Pseudomonas aeruginosa isolates with antibiotic resistance.
Analyzed 32 clinical Pseudomonas aeruginosa isolates for AmpC beta-lactamase expression.
Utilized cloning and sequencing to identify AmpC beta-lactamase variants.
Assessed the impact of cloxacillin on susceptibility to ceftazidime and imipenem.
21 out of 32 isolates overexpressed AmpC beta-lactamase, showing reduced MICs of ceftazidime and imipenem after cloxacillin addition.
Identified 10 AmpC beta-lactamase variants; only those with an alanine at position 105 showed significantly reduced susceptibility to imipenem, ceftazidime, and cefepime.
The AmpC variants created conditions favorable for in vitro selection of imipenem-resistant strains.

Rodríguez-Martínez et al. (2009) studied this question.

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