[A survey on clinical characteristics and risk factors of severe asthma in China].

Objective: To investigate the clinical characteristics and risk factors of severe bronchial asthma in Chinese people over 14 years old. Methods: According to the multi-stage random cluster sampling methods, a total of 164 215 subjects were visited by a questionnaire in the epidemiology survey from eight provinces (Beijing, Shanghai, Guangdong, Liaoning, Henan, Shanxi, Jiangsu, Sichuan provinces) located in seven regions (north, northeast, east, central China, south, southwest and northwest) of China from February 2010 to August 2012. A total of 2 034 were diagnosed as asthma. The clinical characteristics and related risk factors of patients with severe asthma in China were analyzed. Results: Among all asthma patients, 560 were newly diagnosed, accounting for 27.5% (560/2 034) and the percentage of previously confirmed patients was 72.5% (1 474/2 034). A total of 145 were eligible for severe asthma, accounting for 9.8% (145/1 474) of previously confirmed asthmatics and 7.1% (145/2 034) of all asthmatics. 83.5% (121/145) severe asthmatics had at least one trigger factor. Correlation analysis showed that the risk factors of severe asthma were: smoking (OR=1.543, 95%CI: 1.250-1.814), obesity (OR=2.186, 95%CI: 1.972-2.354), petting (OR=2.135, 95%CI: 1.904-2.283), combined with allergic rhinitis (OR=3.456, 95%CI: 2.721-4.326), gastroesophageal reflux disease (OR=1.842, 95%CI: 1.682-2.140), bronchiectasis (OR=1.665, 95%CI: 1.347-1.912) or chronic obstructive pulmonary disease (OR=1.312, 95%CI: 1.171-1.694). Conclusions: The most common comorbidities in severe asthmatics in China are allergic rhinitis and gastroesophageal reflux disease. The risk factors of severe asthma include obesity, allergic rhinitis, gastroesophageal reflux disease, chronic obstructive pulmonary disease, bronchiectasis, smoking and petting.目的： 调查分析我国>14岁人群重症哮喘患者的临床特征和患病危险因素。 方法： 于2010年2月至2012年8月，在我国华北地区的北京市、东北地区的辽宁省、华东地区的上海市和江苏省、华中地区的河南省、华南地区的广东省、西南地区的四川省和西北地区的陕西省共7个大区8个省市，按照多阶整群随机抽样方法对164 215名受访者进行问卷调查。其中确诊2 034例哮喘患者，对其中符合重症哮喘入选标准的哮喘患者进一步分析，了解我国重症哮喘患者的临床特征和患病危险因素。 结果： 2 034例哮喘患者中，首次确诊者560例（27.5%），既往确诊者1 474例（72.5%）；其中145例符合重症哮喘，占既往确诊者的9.8%（145/1 474），占全部哮喘的7.1%（145/2 034）。83.5%（121/145）重症哮喘患者至少存在一种触发因素。相关危险因素分析显示：吸烟（OR=1.543，95%CI：1.250~1.814）、肥胖（OR=2.186，95%CI：1.972~2.354）、饲养宠物（OR=2.135，95%CI：1.904~2.283）、合并过敏性鼻炎（OR=3.456，95%CI：2.721~4.326）、胃食管反流（OR=1.842，95%CI：1.682~2.140）、支气管扩张（OR=1.665，95%CI：1.347~1.912）、慢性阻塞性肺疾病（OR=1.312，95%CI：1.171~1.694）是重症哮喘患病的危险因素。 结论： 我国>14岁人群重症哮喘合并症以过敏性鼻炎、胃食管反流最常见，患病危险因素包括肥胖、过敏性鼻炎、胃食管反流、慢性阻塞性肺疾病、支气管扩张、吸烟、饲养宠物等。.