A Study Protocol for a Randomized, Double-Blind, Placebo-Controlled Clinical Study on the Effect of Qishen Yiqi Dripping Pills on Exercise Endurance and Quality of Life in Patients with Coronary Heart Disease after Percutaneous Coronary Intervention

Table 1

Diagnostic criteria of Qi deficiency and blood stasis syndrome.

	Signs and symptoms
Symptoms	A: fatigue, shortness of breath, and physical weakness, with aggravation after activity; B: purple and dark lip color
Tongue presentation	The tongue is dark or has ecchymosis and ecchymosis; the sublingual vein is tortuous, dilated, and dark purple
Pulse condition	Weak pulse, astringent pulse
Diagnosis	One of A and one of B; or one of A and one abnormal tongue presentation pulse image for clinical diagnosis reference