Study On The Characteristics Of Pulmonary Function In Patients With Asthma-COPD Overlap Syndrome

Objective: For chronic obstructive pulmonary disease(COPD) combined with bronchial asthma overlap syndrome(ACOS) and simple COPD patients of bronchial diastolic reactive agent difference, pulmonary function parameters, the changes were compared, and discuss the inspiratory capacity(IC) on exercise tolerance of patients with COPD and ACOS judgment.Methods: Selected January 2014 to 2015 August in the ACOS98 hospitalized in our hospital, and COPD 176 cases and according to the severity of airflow limitation lung function grading will be grouped into 50 cases of mild, moderate in 50 cases and 50 severe cases, extremely severe in 26 cases. Comparison of ACOS group and COPD group 2 group and COPD4 within the group of bronchial dilation test before and after the change of pulmonary function parameters, and to explore the inspiratory capacity(IC) in ACOS and COPD2 group changes in situation.Results: 1 COPD group FEV1% before and after bronchial dilation test were lower than ACOS(P<0.05). 2FEF25%-75% group of COPD group after was lower than ACOS group(P<0.05). 3 COPD group IC% was lower than ACOS group(P<0.05). 4 COPD4 group compared with IC%group were significantly different(P<0.05).Conclusions: 1 ACOS lung function damage is lighter than COPD. 2 ACOS was more sensitive to the reaction of the airway than the COPD. 3 ACOS endurance, reserve force is better than that of COPD group, ACOS in clinical response to treatment was better than COPD, the condition is also lighter than COPD group. 4 The COPD patients according to the severity of airflow limitation of lung function grading divided into 4 groups. The results show that with increasing the severity of airflow limitation and IC% decreased gradually, that exercise tolerance in patients,respiratory muscle strength decreased with the decline in lung function in COPD and dyspnea aggravated. At the same time, it also suggests that with the increase of air flow limitation, the decrease of IC%, the patients in the clinical treatment gradually decreased,the condition gradually increased, and the prognosis of the patients gradually became worse.