Based on the theory of “treating yang in yin disease”, Professor Cheng Choufu believes that the basic pathogenesis of sick sinus syndrome is yang deficiency and yin excess. He advocates the warming yang method of strengthening yang, tonifying yang and activating yang, which runs through the whole treatment of sick sinus syndrome. He also advocates treatment based on stages. In the early stage of the disease, Mahuang Xixin Fuzi Decoction combined with Yanghe Decoction should be used to treat the root of the disease by warming yang and transfor...