copd 是呼吸系统疾病中的常见病、多发病，其患病率及病死率均高，因肺

copd respiratory disease common disease, its prevalence and mortality are high, due to the progressive decline in lung function was at the same time seriously affect the labor force and quality of life of patients, and gave society and families a heavy financial burden.

Copd is a common disease and multiple morbidity in respiratory diseases, the prevalence and mortality rate are high, because the lung function is decreased, seriously affecting the patient's labor force and quality of life at the same time, but also to the community and the family bring a heavy economic burden.

COPD is a common and frequently occurring disease of respiratory system. Its morbidity and mortality are both high. Because of the progressive decline of lung function, COPD not only seriously affects the labor force and quality of life of patients, but also brings heavy economic burden to society and families.<br>