Pre-trial of Clinical Trial of Traditional Chinese Medicine Treatment for Elderly Patients With Coronary Heart Disease Who Are Still Symptomatic After Optimal Medical Treatment

The experimental group used compound Danshen dripping pills as an intervention on the basis of conventional western medicine treatment.

The experimental group used Qishen Yiqi dripping pills as an intervention on the basis of conventional western medicine treatment.

Intervention with placebo on the Basis of optimal medical treatment