Objective

2

To observe the effect of

Yangyin Xifeng Tongluo Formula

（养阴熄风通络方） and its core herbs combination on prevention of ventricular precontraction （PVC）.

Methods

2

Experiment 1： Forty SD rats were randomly divided into model group， formula group， core herb-pairs medium-dose group and amiodarone group， with 10 rats in each group. Rats in the model group were given 10 ml/（kg·d） of pure water by gavage， rats in the formula group were given 1.125 g/（kg·d） of

Yangyin Xifeng Tongluo Granules

（养阴熄风通络方颗粒） by gavage， rats in the core herb-pairs medium-dose group were given 0.585 g/（kg·d） of granules of core herb-pairs by gavage， and rats in the amiodarone group were given 18 mg/（kg·d） of amiodarone hydrochloride tablets by gavage. The rats in each group were gavaged once a day for 14 consecutive days， and then a PVC model was established using rat tail vein injection of aconitine 25 μg/kg to compare the mortality and incidence of PVC， ventricular tachycardia （VT） and ventricular fibrillation （VF）， the time of the appearance of PVC， and the duration of PVC in the rats in each group. Experiment 2： Sixty SD rats were randomly divided into model group， the amiodarone group， and the core herb-pairs of low， medium and high dose groups， 12 rats in each group. Rats in the model group were gavaged with 10 ml/（kg·d） of purified water， rats in the low， medium， and high dose groups were gavaged with 0.2925， 0.585， and 1.17 g/（kg·d） of the core herb-pairs granules respectively， and rats in the amiodarone group were gavaged with 18 mg/（kg·d） of amiodarone hydrochloride tablets. All of the

m were gavaged once a day. After 14 days， rats in each group were injected intravenously into the tail vein with aconitine 25 μg/kg， and then the rats in each group were observed to show the mortality and incidence of PVC， VT and VF， and the time of appearance and duration of PVC.

Results

2

Experiment 1： Compared with the model group， The difference in the incidence of PVC in rats of all groups was not statistically signi-ficant （

P

＞0.05）， and the mortality and incidence of VT and VF in rats in the formula group， the core herb-pairs medium-dose group， and the amiodarone group significantly reduced， with delayed time of the occurrence of PVC and shorter duration of the PVC （

P

＜0.05 or

P

＜0.01） as compared with the model group， whereas the difference between each group with medication intervention was not statistically significant （

P

＞0.05）. Experiment 2： There was no statistically significant difference in the incidence of PVC in all groups （

P

＞0.05）， and the mortality and incidence of VT and VF reduced in the core herb-pairs of low-， medium-， and high-dose groups and in the amiodarone group， and the appearance of PVC delayed and its duration shortened （

P

＜0.05 or

P

＜0.01） as compared with the control group， whereas the differences were not statistically significant in the comparison among groups with medication （

P

＞0.05）.

Conclusion

2

Both

Yangyin Xifeng Tongluo Formula

and its core herb-pairs could delay the time of occurrence and shorten the duration of PVC.