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[Anti-arrhythmia effect of digoxin antibodies in experimental myocardial infarct (arrhythmogenic action of endogenous digoxin-like factor)].

Suggesting endogenous digoxin-like factor (EDLF) to display arrhythmogenic activities in myocardial ischemia (MI), we studied the effect of anti-digoxin antiserum (ADS) on the ventricular fibrillation threshold (VFT) after the coronary ligation in cats and ventricular arrhythmias caused by MI in rats and chloroform-induced hypoxia in mice. Intravenous administration of ADS (5 mg/kg) enhanced VFT in cats with MI from 11.3 +/- 1.6 to 53.3 +/- 8.1 V (M +/- m; p less than 0.01) and significantly reduced ventricular arrhythmias in rats and mice. Our experiments on the isolated electro-stimulated rat atria demonstrated that EDLF is likely not to be an adrenergic cotransmitter in the heart. Possible mechanisms of the arrhythmogenic action of EDLF are discussed.