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• W4308189440 abstract "Abstract Objectives Sitafloxacin is one of the newer generation fluoroquinolones with highly active against multidrug-resistant (MDR) bacteria. Our objectives were to identify the sitafloxacin pharmacokinetic/pharmacodynamic (PK/PD) index and breakpoints against MDR isolate in the urinary tract infection model. Methods Forty-eight MDR isolates underwent sitafloxacin and levofloxacin microdilution susceptibility testing. A 24 h in vitro model was established that simulated the healthy subjects urodynamics of sitafloxacin fumarate injection. Ten MDR isolates (four carbapenem-resistant Escherichia coli, three carbapenem-resistant P. aeruginosa and three vancomycin-resistant E. faecium) were selected. The drug efficacy was quantified by the change in log colony counts within 24 h. A sigmoid Emax model was fitted to the killing effect data. Monte Carlo simulations were performed to assess target attainment for the sitafloxacin fumarate doses of 100 and 200 mg q24h. Results Analysis indicated that the MICs of sitafloxacin were all significantly lower than that of levofloxacin (P &lt; 0.01). The UAUC0–24h/MIC targets required to achieve stasis, 1-log10 killing and 2-log10 killing were 63.60, 79.49 and 99.45 (carbapenem-resistant E. coli), 60.85, 90.31 and 128.95 (carbapenem-resistant P. aeruginosa), 65.91, 77.81 and 103.11 (vancomycin-resistant E. faecium). Monte Carlo simulation showed the infusion of sitafloxacin fumarate 100 mg q24h was able to achieve 90% probability of target attainment against bacteria with MIC of 8 mg/L for the common complicated urinary tract infections. Conclusions Sitafloxacin fumarate injection is an alternative therapeutic agent for the treatment of UTIs caused by MDR isolates." @default.
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• W4308189440 date "2022-11-04" @default.
• W4308189440 modified "2023-10-14" @default.
• W4308189440 title "Sitafloxacin pharmacokinetics/pharmacodynamics against multidrug-resistant bacteria in a dynamic urinary tract infection <i>in vitro</i> model" @default.
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• W4308189440 doi "https://doi.org/10.1093/jac/dkac365" @default.
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