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pubmed-article:2032474pubmed:abstractTextIn order to assess the apparent diffusion coefficient of two nitrosoureas (carmustine and fotemustine) in the brain, a model of planar diffusion was used in the rat brain and in rat and human brain biopsies. Drugs were deposed on the brain surface at a constant concentration for 30 min. At the end of the diffusion time, the concentration gradient was determined with microelectrodes using voltammetry at 5 different depths in the extracellular space of the gray matter (0-304 microns). Voltammetry with microelectrodes measured quantitatively intact drug in the brain extracellular space (CV 4% for the 2 drugs) in the range studied. The same procedure was used for human and rat brain biopsies which were held in a small cup. The apparent diffusion coefficients in living animals were 0.49 x 10(-6) cm2.s-1 for carmustine and 0.23 x 10(-6) cm2.s-1 for fotemustine; in human biopsies, they were 0.84 x 10(-6) cm2.s-1 for carmustine and 0.37 x 10(-6) cm2.s-1 for fotemustine. Significant differences in the apparent diffusion coefficients of the drugs were accounted for by the fact that the intracellular penetration of fotemustine was better than that of carmustine.lld:pubmed
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pubmed-article:2032474pubmed:articleTitleComparative diffusion study of two nitrosoureas: carmustine and fotemustine in normal rat brain, human and rat brain biopsies.lld:pubmed
pubmed-article:2032474pubmed:affiliationFaculté de Médecine Xavier-Bichat, Paris, France.lld:pubmed
pubmed-article:2032474pubmed:publicationTypeJournal Articlelld:pubmed
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