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Effects of Ber on the occurrence time of arrhythmias and the dose of AC for inducing arrhythmias in rats. (A) Occurrence times and (B) amount of AC. Group A: Ventricular premature contraction discrete; Group B: Ventricular premature contraction bigeminy; Group C: Successive ventricular tachycardia; Group D: Ventricular fibrillation; Group E: Mortality. *P<0.05 and **P<0.01 vs. AC group. Ber, Berberine; AC, aconitine.
