• Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, Sichuan, 610041, China;
LiangBinmiao, Email: liangbinmiao@163.com
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Objective To assess the lung capacity and diffusing capacity in patients with chronic persistent asthma with different severities. Methods Patients diagnosed with chronic persistent asthma in West China Hospital between January 2014 and April 2015 were recruited in the study.The data of clinical characteristics were collected.The forced expiratory volume in the first second (FEV1) was determined by spirometry test.Total lung capacity (TLC) and residual volume (RV) were determined by body plethysmography and helium dilution method.Single breath diffusing capacity for carbon monoxide (DLCO) was also measured.Lung capacity and the deviations between two methods, and DLCO%pred were compared among different patient groups with mild, moderate and severe asthmas.The correlation between spirometry with lung capacity and DLCO%pred were analyzed. Results A total of 93 patients with chronic persistent asthma were enrolled.With the severity of asthma, TLC%pred, RV%pred, RV/TLC and the deviations of the ones between two methods increased significantly, but DLCO%pred reduced slightly.FEV1%pred were negatively correlative with the deviations of lung capacity between two methods, and positively correlative with DLCO%pred. Conclusions Compared with helium dilution method, the body plethysmography is more accurate for evaluating the lung capacity of chronic persistent asthma.With the severity of airflow limitation, the diffusing capacity of asthma is decreasing gradually, but still within the normal limits.

Citation: DuJing, LiLinwei, ZuPing, DengYan, HeTailing, YuanYuru, LiangBinmiao. Lung Capacity and Diffusing Capacity in Patients with Chronic Persistent Asthma with Different Severities. Chinese Journal of Respiratory and Critical Care Medicine, 2016, 15(1): 60-63. doi: 10.7507/1671-6205.2016015 Copy

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