Ethnopharmacological relevance: Yiqi Huoxue Huatan granule is an empirical traditional Chinese medicine formula that has been widely used for the treatment of respiratory diseases. However, whether Yiqi Huoxue Huatan granule has a therapeutic effect on patients with stable COPD complicated with chronic respiratory failure remain unclear.
Aim of the study: To evaluate the efficacy and safety of Yiqi Huoxue Huatan granule in treating this population.
Material and methods: This is a double-blind randomized clinical trial, conducted at 15 health centers in China from October 2019 to December 2021. 372 participants aged 40-80, were enrolled. All had been diagnosed with stable COPD and exhibited PaO2<60mmHg and PaCO2>50mmHg during quiet breathing at sea level according to arterial blood gas analysis results. Eligible patients were randomly assigned to the treatment group (Yiqi Huoxue Huatan granule combined with western medicine), or the control group (a placebo together with western medicine). The treatment phase lasted 52 weeks, followed by a 52-week follow-up. The primary outcomes were mortality and the frequency of acute exacerbations of COPD.
Results: 186 patients in the treatment group and 186 in the control group were for intention-to-treat analysis. Among them, a total of 317 patients were included in the per protocol set. Yiqi Huoxue Huatan granule combined with western medicine was found to reduce all-cause mortality by 5.62%. Specifically, there were 11 deaths (6.96%, 95% CI -2.95% to 10.97%) in the treatment group compared to 20 (12.58%, 95% CI -7.37% to 17.79%) in the control group, P=0.131. Moreover, the frequency of acute exacerbations was significantly reduced in the follow-up period (1.04±1.25 [95% CI -0.84 to 1.24] in the treatment group vs 1.24±1.40 [95% CI -1.02 to 1.46] in the control group, P=0.183 during treatment period, while 0.71±1.01 [95% CI -0.54 to 0.87] in the treatment group vs 1.03±1.22 [95% CI -0.83 to 1.23] in the control group, P=0.016 during follow-up period). For safety analysis, six of 186 patients in the treatment group and three of 186 patients in the control group suffer adverse events.
Conclusions and relevance: Yiqi Huoxue Huatan granule is proved to be able to reduce the mortality and the frequency of acute exacerbations of COPD. Thus, it can serve as a reasonable therapeutic option for patients with stable COPD complicated by chronic respiratory failure.
Trial registration: ClinicalTrials.gov Identifier: NCT04208581.
Keywords: Chronic Obstructive Pulmonary Disease; Chronic Respiratory Failure; Yiqi Huoxue Huatan Granule.
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