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Acute myocardial effects of mitoxantrone in the rabbit
Abstract:
Some clinical studies that were performed for the purpose of assessing the potential cardiotoxicity of mitoxantrone (DHAD) have shown that repeated administrations of the drugs in some patients cause a mild impairment of cardiac functions and morphological changes in the myocardial cells qualitatively similar to those elicited by anthracyclines. Since doxorubicin has been reported to cause acute cardiac effects, probably related to its chronic cardiotoxicity, experiments were carried out on the rabbit heart to investigate whether DHAD is also able to induce acute cardiac effects. Our results show that this drug caused a reversible dose-related impairment of cardiac contractility on the isolated and perfused rabbit heart while it was not able to induce ECG alterations in normal rabbits. These findings demonstrate that in the rabbit DHAD induces an acute cardiac activity qualitatively similar to that of doxorubicin and suggest that this animal model could be a useful tool to study the cardiac actions and related pathogenetic mechanism(s) of this antitumor drug.
Insights
Mitoxantrone (DHAD) causes reversible, dose-related cardiac contractility impairment in rabbits, similar to doxorubicin. This animal model aids in studying DHAD
Area of Science:
- Cardiology
- Pharmacology
- Oncology
Background:
- Clinical studies suggest mitoxantrone (DHAD) may cause cardiotoxicity, similar to anthracyclines.
- Doxorubicin is known to induce acute cardiac effects, potentially linked to chronic cardiotoxicity.
Purpose of the Study:
- To investigate if mitoxantrone (DHAD) induces acute cardiac effects in a rabbit model.
- To compare the acute cardiac effects of DHAD with doxorubicin.
Main Methods:
- Experiments were conducted on isolated and perfused rabbit hearts.
- Electrocardiogram (ECG) alterations were assessed in normal rabbits.
Main Results:
- Mitoxantrone (DHAD) induced a reversible, dose-related impairment of cardiac contractility.
- No significant ECG alterations were observed in normal rabbits treated with DHAD.
Conclusions:
- Mitoxantrone (DHAD) exhibits acute cardiac activity in rabbits, similar to doxorubicin.
- The rabbit heart model is a valuable tool for studying DHAD's cardiac actions and mechanisms.