Bidirectional Cohort Study on Improvement of Quality of Life in Patients After Coronary Intervention With Kuanxiong Aerosol

The goal of this observational study is to compare in patients with Angina Pectoris after PCI for Coronary Heart Disease. The main questions it aims to answer are: * To evaluate the effect of Kuanxiong Aerosol on the quality of life of patients with angina pectoris after PCI for Coronary Heart Disease. * To evaluate the effect of Kuanxiong Aerosol on relieving angina pectoris and improving cardiac function. The comparison group will received routine treatment .The experimental group will received sublingual spray of Kuanxiong Aerosol on the basis of routine treatment，two sprays per time，three times a day, for a continuous month. After 1 month of treatment, the quality of life, the improvement of cardiac function and the relief of angina pectoris were compared between the two groups. Researchers will compare two groups to see if Kuanxiong Aerosol can improve the quality of life, cardiac function, and reduce the frequency and duration of angina pectoris in patients with angina pectoris after PCI.