Analysis of pulmonary function characteristics for asthma and chronic obstructive pulmonary disease overlap syndrome in the elderly males / 中华老年医学杂志

ABSTRACT

Objectives To investigate the incidence rate of asthma and chronic obstructive pulmonary disease (COPD) overlap syndrome(ACOS)in elderly male patients with stable COPD by following-up,and to explore the characteristics and clinical significance of pulmonary function for ACOS.Methods According to GOLD and Spain's guidelines for the diagnosis and treatment of COPD,we screened ACOS patients in 299 elderly male patients with stable COPD by following up in Beijing Hospital between 2003 and 2014.All patients were divided into 2 groups of 51 ACOS patients and 248 non-ACOS patients with COPD.All patients underwent pulmonary function tests and bronchial dilation test in the stable condition.The differences in pulmonary functions were compared between stable ACOS patients and non-ACOS patients with COPD.Results Among 299 elderly male patients with stable COPD,ACOS patients accounted for 17.1 ％ (51/299).Compared with nonACOS patients with stable COPD,ACOS patients had significantly lower baseline values in forced expiratory volume in 1 seconds(FEV1) [(61.0 ± 14.5) ％ pred vs.(74.4 ± 20.0) ％ pred],in forced expiratory volume in 3 seconds(FEV3) [(71.6± 14.3)％ pred vs.(82.7± 19.6)％ pred]and in forced vital capacity(FVC) [(84.6 ± 16.4)％ pred vs.(93.8 ± 20.6)％ pred],and also had significantly higher values in residual volume(RV)[(139.4±55.8)％ pred vs.(118.8±46.6)％ pred]and in RV/total lung capacity(TLC) [(52.7±10.7)％ pred vs.(48.1±10.9)％ pred],all P＜0.05.After bronchodilation test,there was no significant difference in FEV1,FEV3 and FVC between the two groups(all P＞0.05).Patients with stable ACOS had lower value in forced expiratory flow rat (FEF25％±75％)than those with non-ACOS in baseline [FEF25％-75％ ％ pred(26.8± 11.5) ％ vs.(36.1 ±17.5) ％ (P＜0.05)],and the improvement of small airway function was significantly better in ACOS patients than in non-ACOS patients after bronchodilation test (P＜0.05).Conclusions ACOS is very common in the elderly patients with COPD,stable ACOS patients have lower time vital capacity as compared with non-ACOS patients with stable COPD.But after bronchodilation test,the two groups have similar ventilation function,and the small airway function in ACOS patients improves more significantly.The ACOS patients have unique characteristics of pulmonary functions and suitable treatment may improve the prognosis.