Lung function analysis and epidemiological survey of patients with bronchial asthma combined with allergic rhinitis in Tianjin area

Objective To study the epidemiology of allergic rhinitis in bronchial asthma patients from Tianjin and to analyze the correlation of clinical characteristics as well as the lung function between allergic rhinitis and bronchial asthma.Methods A questionnaire survey of 142 bronchial asthma patients from the city of Tianjin was carried out.Their cognitive environment,treatment status and Lung function condition were investigated in detail,and a database was set up for statistics.Results In 142 bronchial asthma patients,97 (68％) were accompanied with allergic rhinitis,in which 60(61.9％) had allergic rhinitis earlier.The gender,episode ages and their courses of bronchial asthma of both groups had no significant differences (P ＞0.05),but the courses of allergic rhinitis was significantly longer than the courses of bronchial asthma in asthma patients that had allergic rhinitis (P ＜0.05).Compared to asthma patients who had no allergic rhinitis,the asthma control test (ACT) score,peak expirationg flow (PEF) ％,MEF75％ and MEF50％ of asthma patients who had allergic rhinitis were significantly lower,and the inhaled glucocorticoids (IC) was decreasing as well as the R20 was increasing.The classification and severity of allergic rhinitis and bronchial asthma are highly coherent (rs =0.604,P ＜ 0.01).Conclusions Allergic rhinitis which is one of the important risk factors in leading asthma often occurred before asthma,and its classification and severity are highly consistent with bronchial asthma.The ACT score of asthma patients combined with allergic rhinitis were significantly lower than those with asthma alone.allergic rhinitis can result in lung ventilation function decline and airway resistance increases,for which increase the difficulty of controlling asthma. Key words: Allergic rhinitis; Bronchial asthma; Asthma control test; Lung function