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Evaluation of Anthracycline Cardiotoxicity with the Model of Isolated, Perfused Rat Heart: Comparison of New Analogues Versus Doxorubicin

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Specialty Oncology
Date 1995 Jan 1
PMID 7805186
Citations 4
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Abstract

We have compared the cardiotoxicity of 3 anthracyclines in a model of isolated perfused rat heart using the Langendorff technique. The contractile state and ventricular compliance were studied. Doxorubicin, epirubicin and pirarubicin were perfused at concentrations of 10(-6) and 10(-5) M during 70 min. The cardiac accumulation of the drugs was studied by HPLC. No significant alteration of cardiac functional parameters was observed at 10(-6) M. At 10(-5) M, epirubicin produced a significantly greater alteration of cardiac contractility than doxorubicin, whereas pirarubicin exerted first an inotropic effect followed by a recovery to initial values at the 60th min. Anthracycline accumulation in the heart was dose-dependent; epirubicin accumulated to a 30% greater extent than doxorubicin and pirarubicin heart concentrations were 4-5 times higher than those of doxorubicin at the end of the perfusion. These results suggest that doxorubicin and epirubicin have the same intrinsic cardiac toxicity, and that their distinct clinical cardiotoxicity must be explained by pharmacokinetic differences, whereas pirarubicin is much less cardiotoxic than the other anthracyclines because of different pharmacodynamic properties.

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