COPD是以不完全可逆性气流受限为特征的进展性肺疾病， 与肺部对香烟烟雾等有害气体或有害颗粒的异常炎症反应有关。病理改变存在于外周气道、中央气道、肺实质和肺血管系统等， 也可引起肺外的不良效应， 但外周气道病变和功能异常是导致不完全可逆气流受限的主要原因。国内外采用吸入支气管舒张剂后一秒率( FEV1／FVC) 小于70％来进行定性诊断。
Objective To investigate the cognition degree and clinical use of new COPD classification system of 2011 GOLD in respiratory specialists, and further analyze the reasons of failing to clinical use. Methods Respiratory specialists from 42 hospitals in Chongqing were investigated through questionnaire survey. The questionnaire contains two parts. The first part contains nine questions about the knowledge of 2011 GOLD new COPD classification system and its clinical use. The second part contains six questions about the reasons of failing to clinical use of the COPD classification system. Results A total of 204 valid questionnaires were recovered. More than 90% respiratory specialists had understood the new COPD classification system with different degree, and believed it is suitable for clinical use. More than twothirds respiratory specialists knew well the ways about CAT and mMRC, but only 24% specialists were using these ways. The main reasons of failing to clinical use were as follows: 60% specialists believed the pulmonary function test can evaluate the COPD classification, and 66. 7% specialists were limited by short visit time. The cognition degree and clinical use of the new COPD classification systemin the specialists from third grade A class hospitals was better than those from the other hospitals. But the difference was not significant among specialists with different professional title.Conclusion Respiratory specialists in Chongqing knew well about the new COPD classification systemin 2011 GOLD, but did not use it widely in clinical works due to the complicated operation of the new COPD classification system.