Résumé
Methoxyadiantifoline ( MAF) is a new alkloid isolated from Thalictrum Omeience W.T.Wang.During 3 min reperfusion after 10 min of coronary ligation, MAF 5 ?mol/L significantly decreased the incidence of isolated rat hearts with ventricular arrhythmias ( VF and VT ) . It delayed the onset of ventricular fibrillation and shortened its duration and markedly prolonged the time of normal sinus rhythm. It also significantly decreased the release of LDH from the myocardium in isolated rat hearts. In addition , MAF 5 ?mol/L could decrease the heart rate and coronary resistance. The results suggest that MAF possessed protective effects on the reperfusion injury in isolated rat hearts.
Résumé
Methoxyadiantifoline 10 mg/kg i.v. significantly increased the arrhythmia- inducing dose of aconitine in anaesthetized rats, and that of ouabain in anaesthetized guinea pigs. It markedly prevented ventr icular fibrillation induced by chloroform. Methoxyadiantifoline is also effective in preventing reperfusion-induced arrhythmias in anaesthetized rats. It was demonstrated that methoxyadiantifoline slowed heart rate significantly, and prolonged P-R and Q-Tc interval of ECG in rats.