Quantitative analysis of antimicrobial effect kinetics in an in vitro dynamic model

Variants of the available methods for estimating antimicrobial effect kinetics in an in vitro dynamic model were analyzed. Two integral parameters characterizing antimicrobial effect duration (T(E)) and intensity (I(E)) are suggested to define and analyze the concentration-effect relationships in these models, irrespective of the method of recording. T(E) is defined by the time from the moment of antibiotic administration to the moment when the bacterial count again reaches its initial level. I(E) is defined by the area between the microbial growth curves in the presence and absence of an antibiotic. T(E) and I(E) were used to quantify the antimicrobial effects of sisomicin on Pseudomonas aeruginosa 58, Escherichia coli 93, and Klebsiella pneumoniae 5056, simulating the pharmacokinetic profiles of the drugs observed following intramuscular administration in therapeutic doses, including the variability of aminoglycoside concentrations in human blood.