Objective:To investigate the relationship of NO and ET syndrome differentiation of traditional Chinese medicine in coronary heart disease with angina pectoris. Methods:The levels of serum NO and ET in the 60 patients with angina pectoris of coronary heart disease were detected with the nitrate reductase method and radio-immunity in clinic, and the 20 normal persons were compared. Results: The NO levels were lower in the syndrome of heart blood stasis than that in the syndrome of heart qi deficiency, lower in the syndrome of heart yin deficiency than that in the syndrome of heart qi deficiency ...