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[Effect of isoptin on toxic and cardiotonic effect of strophanthin K]
Abstract:
Two models of heart failure were used in rat experiments to study the effect of isoptin on tolerance to the toxic effect of k-strophanthin. Calcium antagonist-induced changes in the cardiotonic and chronotropic effects of the cardiac glycoside and myocardial oxygen consumption were examined in isolated frog atria with a movable-electrode electron tube and polarography. Isoptin was shown to substantially enhance tolerance to the toxic effect of k-strophanthin and slightly decrease positive inotropic effects of the cardiotonic, by slowing down its development rate. The agent potentiated the negative chronotropic action and lowered myocardial oxygen consumption.
Insights
Isoptin significantly improved tolerance to k-strophanthin toxicity in heart failure models. This calcium antagonist reduced cardiotonic effects and myocardial oxygen consumption while enhancing negative chronotropic actions.
Area of Science:
- Pharmacology
- Cardiology
- Toxicology
Background:
- Cardiac glycosides like k-strophanthin are vital for treating heart failure but have narrow therapeutic windows.
- Understanding agents that modulate cardiac glycoside toxicity is crucial for improving patient outcomes.
Purpose of the Study:
- To investigate the effects of isoptin, a calcium antagonist, on the tolerance to k-strophanthin toxicity.
- To examine how isoptin influences the cardiotonic, chronotropic, and myocardial oxygen consumption effects of cardiac glycosides.
Main Methods:
- Utilized two rat models of heart failure.
- Employed isolated frog atria with a movable-electrode electron tube and polarography to assess drug effects.
- Measured cardiotonic and chronotropic effects, and myocardial oxygen consumption.
Main Results:
- Isoptin substantially enhanced tolerance to k-strophanthin's toxic effects.
- Isoptin slightly decreased the positive inotropic effects of k-strophanthin, slowing their onset.
- The drug potentiated the negative chronotropic action and reduced myocardial oxygen consumption.
Conclusions:
- Isoptin demonstrates a protective effect against k-strophanthin toxicity in heart failure models.
- Isoptin modulates the pharmacological actions of cardiac glycosides, offering potential therapeutic benefits.
- The findings suggest isoptin may improve the safety profile of cardiac glycoside therapy.