Answer: B

The anti-arrhythmic effect of Aconite: Aconite has a significant anti-bradyarrhythmic effect. Aconite has a preventive effect on ventricular fibrillation in mice caused by chloroform, and can resist arrhythmia in rats caused by aconitine. Higenamine has a significant preventive and therapeutic effect on bradyarrhythmia in mice caused by verapamil. It can improve atrioventricular conduction, accelerate heart rate, and restore sinus rhythm. It has a certain therapeutic effect on sinus node hypofunction in rabbits caused by formaldehyde, and can normalize the functions of the sinus node and atrioventricular node.