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• W2079889984 abstract "The reason bacterial endocarditis is difficult to cure has been controversial for many years. One explanation could be that antibiotic diffusion inside the vegetations is heterogeneous. This hypothesis was investigated by means of an autoradiographic study of diffusion of labeled antibiotics into large infected cardiac vegetations of nutritionally variant Streptococcus endocarditis in rabbits. Ten days after infection, 653 microCi of [3H]penicillin, 410 microCi of [3H]tobramycin, or 174 microCi of [14C]teicoplanin were injected iv over 30 min. Thirty minutes after the end of infusion (T30), vegetation/blood radioactivity ratios were 2.48 +/- 1.27, 2.49 +/- 0.67, and 3.94 +/- 1.19 for penicillin, tobramycin, and teicoplanin, respectively. Autoradiography clearly showed that distribution of the three drugs was different: Tobramycin was homogeneously distributed; penicillin was more concentrated at the periphery but still reached the center of vegetations; teicoplanin was concentrated only at the periphery. The same distribution pattern was observed with teicoplanin at T120 (i.e., one t1/2 beta later) and also after simultaneous infusion of a therapeutic dose (15 mg/kg) of cold teicoplanin. The diffusion gradient exhibited by some antibiotics could explain the difficulty in sterilizing vegetations despite high local concentrations, and the deleterious effect of the size of the vegetations on the therapeutic response." @default.
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• W2079889984 date "1989-05-01" @default.
• W2079889984 modified "2023-10-16" @default.
• W2079889984 title "Evaluation of Antibiotic Diffusion into Cardiac Vegetations by Quantitative Autoradiography" @default.
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• W2079889984 doi "https://doi.org/10.1093/infdis/159.5.938" @default.
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