Comparative Studies on Cardiotoxicity of Some Anthracycline Antitumor Antibiotics

Abstract
Isolated atria of guinea-pigs showed negative inotropic and negative chronotropic responses after violamycin B I (V), carminomycin (C) and daunomycin (D), respectively. The mean effective concentrations in reducing amplitude (IC50) were 5.9 × 10–4 mol × 1–1 for V and 1.3 × 10–4 mol × 1–1 for C and D. In rabbits, intravenous injections of different doses of the antibiotics twice weekly for one month produced histopathological alterations in the myocardial tissue, which were smaller after D than after C or V.

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