Activity of plazomycin and amikacin and evaluation of the inoculum effect in carbapenemase producing enterobacteria

Authors

  • Washington Paúl Culqui Molina
  • Segundo Moisés San Lucas Coque

Keywords:

Enterobacteriaceae, amikacin, plazomicin, inoculum, carbapenemases

Abstract

Carbapenemase-producing Enterobacteriaceae represent a significant threat in modern medicine due to their increasing resistance to multiple drugs. Plazomicin, a new aminoglycoside, has shown promising bactericidal activities against these multidrug-resistant bacteria. The objective of this study was to interpret, through a bibliographic review, the activity of plazomicin and amikacin, and to evaluate the inoculum effect in carbapenemase-producing Enterobacteriaceae. Bibliographic searches were conducted in databases such as PubMed, Scopus, and Google Scholar, using specific terms like "Amikacin," "Plazomicin," "Inoculum effect," and their English equivalents. Twelve studies on plazomicin were reviewed, encompassing a total of 47,755 Enterobacteriaceae strains, along with 8 additional studies that included 664 strains of Enterobacteriaceae and other Gram-negative bacilli. The results indicated that plazomicin possesses superior bactericidal activity compared to amikacin, with CMI90 values generally below its cutoff point. Furthermore, the observed resistance percentage for plazomicin was considerably lower compared to amikacin. The analysis of the inoculum effect reveals that, although not directly related to resistance mechanisms, it is a strain- and antibiotic-dependent factor, with beta-lactams and carbapenems being the most susceptible to inoculum size. In conclusion, plazomicin proves to be an effective option against carbapenemase-producing Enterobacteriaceae, with superior activity and lower resistance compared to amikacin. Considering the inoculum effect is essential to optimize antimicrobial treatments and improve clinical outcomes.

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Published

2024-11-06

How to Cite

1.
Culqui Molina WP, San Lucas Coque SM. Activity of plazomycin and amikacin and evaluation of the inoculum effect in carbapenemase producing enterobacteria. Rev Cubana Inv Bioméd [Internet]. 2024 Nov. 6 [cited 2025 Dec. 8];43. Available from: https://revibiomedica.sld.cu/index.php/ibi/article/view/3543