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  • Title: Efficacy of sulbactam and its combination with imipenem, colistin and tigecycline in an experimental model of carbapenem-resistant Acinetobacter baumannii sepsis.
    Author: Dinc G, Demiraslan H, Elmali F, Ahmed SS, Metan G, Alp E, Doganay M.
    Journal: Chemotherapy; 2013; 59(5):325-9. PubMed ID: 24525528.
    Abstract:
    BACKGROUND: In recent years, multidrug-resistant Acinetobacter baumannii has been reported as an important nosocomial pathogen, and treatment options are limited. The aim of this study was to investigate the additional effect of sulbactam on monotherapy with colistin, tigecycline and imipenem in experimental sepsis with carbapenem-resistant A. baumannii in mice. METHODS: Sepsis was developed in 8- to 10-week-old BALB/c mice by an intraperitoneal injection of A. baumannii. Antibiotic was given intraperitoneally 2 h after bacterial inoculation. Each experimental group had 15 mice and was divided into 3 subgroups. Mice were sacrificed at 24, 48 or 72 h. Lung, liver, heart and spleen samples were cultured, and homogenates of lung and liver were used to detect the number of colony-forming units per gram. Bacterial clearance was compared in lung and liver at different time points. RESULTS: Imipenem did not decrease the bacterial load, but the other antibiotics showed significant bactericidal activity compared with the control group, and the combination of imipenem with sulbactam decreased the bacterial load in lung and liver. However, the addition of sulbactam to colistin and tigecycline had no significant effect on bacterial counts. Only the addition of sulbactam to imipenem showed better bactericidal activity compared to imipenem alone. CONCLUSIONS: These results suggested that combining sulbactam with tigeycline or colistin does not increase the efficiency of these antibiotics.
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