The effects of taurine and propafenone combination on experimental arrhythmias and its influence on cardiac contractility of anesthesized rats / 中国药理学通报

ABSTRACT

AIM To investigate the effects of taurine(TAU) and propafenone(PRO) combination on experimental arrhythmias and its influence on haemodynamics of anesthesized rats' heart. METHODS Rats were pretreated respectively with intravenous administration of saline, TAU, PRO, or TAU and PRO combination. Afterwards, the rats were intravenously administrated with BaCl 2 or aconitine to induce arrhythmia. The arrhythmia lasting time and incidence were observed and recorded on the lead Ⅱ ECG. The cumulative aconitine dosage to induce premature ventricular contraction(PVC), ventricular tachycardia(VT) and ventricular fibrillation(VF) were calculated respectively. The haemodynamic parameters such as LVSP, HR, +d p /d t max were recorded continuously in anesthetized rats pretreated with iv TAU, PRO or TAU and PRO combination. RESULT In BaCl 2 arrhythmia, the arrhythmia duration was shortened significantly; and the arrhythmia incidence was decreased in the combination group, as compared with the single same dosage drug groups. In aconitine arrhythmia, the cumulative aconitine dosages to induce PVC, VT and VF were increased significantly in the combination group. Haemodynamics parameters showed that PRO(2mg?kg -1 iv) significantly decreased LVSP and +LVd p /d t max , while these parameters were not significantly changed in the combination group with same dose of PRO. CONCLUSION TAU and PRO have synergism in antiarrhythmia in both BaCl 2 and aconitine induced arrhythmia; TAU may alleviate cardiac depression exerted by PRO.