BACKGROUND

Kuan Xiong aerosol (KXA) is a Chinese herbal compound used to regulate qi-flowing to relieve pain and improve angina. However, only a few pharmacological studies on this traditional Chinese medicine preparation have been reported to confirm these activities.

OBJECTIVES

This article aims to observe the effect of resisting acute myocardial ischemia (AMI) in vivo and dilating vessel in vitro of KXA.

METHODS

The AMI model involves intravenously injecting the pituitary (2 U.kg) into the ear of rabbits. Electrocardiograph (ECG) T waves were then recorded after administration, and the falling range was calculated. Following this, the level of serum Cardiac troponin T (cTn-T) and the histopathology of the cardiac muscle tissue were evaluated. In vitro, the effect of KXA on vasodilation of isolated aortic rings that had been pre-contracted with KCl (30 mM) was observed.

RESULTS

It was found that KXA reduced ECG ST-T waves and serum cTn-T in the rabbit AMI model, protecting myocardial tissue from fracturing and loss of myocardial fibers and inhibiting inflammatory cell infiltration, cavitation degeneration, and karyopyknosis of the myocardial matrix. Furthermore, the administration of 0.215, 1.075, and 2.150 mg.mL of KXA resulted in significant relaxation of the aortic rings at a rate of 69.63 %, 90.14 %, and 118.72 % (p < 0.01) in the untreated ones, and a second shrinkage ratio of 20.17 %, 4.29 %, and 4.54 % (p < 0.01) in the untreated ones, respectively.

CONCLUSION

These results suggest that KXA protects against AMI, contributes to the dilation of blood vessels, and has long-acting effectiveness.