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[Electrocardiographic changes in the rat induced by digitalis glucosides]
Summary
Electrocardiographic changes from desacetil-lanatoside C and digitoxin in rats showed similar effects. Both cardiac glycosides exhibit dual mechanisms for negative chronotropic action and reversible effects on AV conduction.
Area of Science:
- Pharmacology
- Cardiology
- Physiology
Context:
- Cardiac glycosides like desacetil-lanatoside C and digitoxin are used clinically.
- Understanding their precise electrophysiological effects is crucial for safe administration.
Purpose:
- To compare the electrocardiographic effects of desacetil-lanatoside C and digitoxin in an animal model.
- To elucidate the mechanisms underlying their chronotropic and dromotropic actions.
Summary:
- Intravenous administration of desacetil-lanatoside C and digitoxin in anesthetized rats produced comparable electrocardiographic changes.
- Both agents demonstrated a dual mechanism for negative chronotropic effects (indirect vagal reflex and direct cardiac action) and transient, reversible atrioventricular (AV) conduction delays or block.
- Observed subendocardial damage and extrasystoles were infrequent and short-lived.
Impact:
- Provides insights into the comparative cardiac electrophysiology of two related cardiac glycosides.
- Contributes to a better understanding of the dose-dependent and time-dependent effects of these drugs on heart rate and conduction.
- Informs clinical practice regarding the monitoring and potential adverse effects of desacetil-lanatoside C and digitoxin.