Chin J Integr Med
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Randomized Controlled Trial
Preventive Effects of Qingfei Yihuo Capsules () on Air Pollution Associated Exacerbation of Chronic Obstructive Pulmonary Disease: A Single-blind, Randomized, Controlled Trial.
To investigate the efficacy of Qingfei Yihuo Capsules (, QYCs) in preventing the air pollution associated exacerbation of chronic obstructive pulmonary disease (COPD). ⋯ For patients with Group D COPD, oral QYCs in high-incidence season of air pollution can effectively mitigate respiratory symptoms associated with air pollution, although there was no evidence that it had a significant reductive effect on AEs. (Registered at Chinese Clinical Trial Registry, registration No. ChiCTR-IOR-17013827).