Abstract
A series of experiments with the isolated perfused rat lung was carried out to study the distribution of ciprofloxacin in this tissue under different experimental conditions; the influence of drug administration rate and the presence of oedema were evaluated by comparison of the statistical moment and distribution coefficient values as well as the unit disposition function (UDF) profiles in the tissue. The polyexponential character of the outflow perfusate curves indicates a distribution behaviour which does not correspond to the 'well stirred model' but rather to the existence of some type of diffusion barriers and/or tissue binding. The presence of oedema in the tissue, induced by insufficient oxygenation of perfusate, significantly increases the distribution coefficient of ciprofloxacin and leads to relevant modifications in the unit disposition function (UDF) of the isolated lung, while administration rate does not significantly affect the kinetic behaviour of the drug in this tissue.
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