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• W2123160131 abstract "A possible explanation for the difficulties encountered in curing deep fibrin-embedded infections is that antibiotic diffusion inside the infected fibrin matrix is not homogeneous and is insufficient to neutralize the pathogen. To evaluate this conjecture, the differential pharmacodynamics of daptomycin in fibrin clots infected with methicillin-susceptible and -resistant Staphylococcus aureus and Staphylococcus epidermidis was estimated. Daptomycin (20 or 50 mg/kg of body weight) was infused over 30 min. Fibrin clots and blood samples were evaluated from 0.5 to 42 h after the injections. The half-lives of daptomycin in serum and fibrin clot were close to identical after the two doses and averaged 5.4 and 22 h, respectively. The mean areas under the concentration-time curves from 0 to 42 h (AUC0-infinity) for daptomycin concentrations in serum and infected clots were 575 +/- 36.7 and 215 +/- 6.2 micrograms/g/h after administration of 20 mg/kg and 1,089 +/- 39.9 and 326 +/- 16.8 micrograms/g/h after administration of 50 mg/kg. A concentration gradient from the periphery to the core of the clots was observed in many clots up to 18 h after treatment. Mean peak concentrations in the core of the clots reached 60% of the peripheral values (P < 0.05) and were delayed for at least 3 h compared with the peripheral peak concentrations. AUC0-42 h of daptomycin concentration in the periphery and the core of clots were significantly different (P < 0.01). Survival of microorganisms was better in the core than in the periphery, with as much as a 3 log10 CFU/g difference between the center and the surface of the clot. Bacterial examination by transmission electron microscopy also showed noticeable differences in ultrastructural changes between those in the periphery and those in the core of the clots. In conclusion, the pharmacokinetics of daptomycin are significantly different at the periphery and within the core of fibrin clots, which may have led to the higher bacterial survival in the core of clots. Limited diffusion of daptomycin in fibrin, an essential component of the vegetation in bacterial endocarditis, could explain at least in part some of the treatment failures." @default.
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• W2123160131 date "1996-01-01" @default.
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• W2123160131 title "Differential increased survival of staphylococci and limited ultrastructural changes in the core of infected fibrin clots after daptomycin administration" @default.
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• W2123160131 doi "https://doi.org/10.1128/aac.40.1.203" @default.
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