The relationship between volumetric capnography and the severity of chronic obstructive pulmonary disease
10.3760/cma.j.issn.0254-9026.2017.07.012
- VernacularTitle:呼出气二氧化碳容积曲线与慢性阻塞性肺疾病严重程度的相关性
- Author:
Chunhui ZHANG
;
Shaobin LIU
;
Jihong WANG
;
Yu LIU
;
Yongming GUO
;
Xin LIU
;
Qinhua LIU
;
Yuzhen JI
;
Caiyun LI
- Keywords:
Pulmonary disease,chronic obstructive;
Respiratory function tests;
Maximal expiratory flow-volume curves
- From:
Chinese Journal of Geriatrics
2017;36(7):765-769
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the correlation between volumetric capnography(VCap)and traditional pulmonary function in chronic obstructive pulmonary disease(COPD),so as to assess whether VCap can be used as alternative indicators for the evaluation of COPD severity when some of the elderly COPD patients do not accomplish the traditional pulmonary function tests.Methods 960 patients admitted to Fujian Geriatric Hospital from June 2008 to June 2015 and undergoing pulmonary function tests were included in the study.They were divided into 2 groups of the COPD group(640 cases)and the control group(320 cases).The pulmonary function of COPD group was divided into 4 subgroups(Ⅰ~Ⅳ).All persons received tests of traditional pulmonary function and VCap.The correlations between VCap and traditional pulmonary function indexes and between VCap and COPD severity were observed.Results The differences in Vm25-50/VT,Vm50-75/VT,dC/dV3,SR23 of VCap between the 4 subgroups(COPDⅠ~COPDⅣ)and control group were statistically significant(all P<0.05),while the difference in dC/dV2 of VCap between the 4 subgroups(COPDⅠ~COPDⅣ)and control group was not statistically significant(t=-0.22,-0.43,0.26 and 0.64,all P>0.05).The difference in CO2 max between the COPD Ⅲ group(severe or more severe group)and control group was statistically significant(t=6.91 and 4.65,all P<0.05).The difference in VD-B/VT and VD-F/VT of VCap between the COPD(Ⅱ~Ⅳ)group(from moderate to very severe group)and control group were statistically significant(all P<0.05).CO2 max,VD-B/VT,VD-F/VT,Vm25-50/VT,Vm50-75/VT,dC/dV3,SR23 of VCap showed correlation with traditional pulmonary function.The correlation between dC/dV3 and the seven traditional pulmonary function indexes seen above was statistically significant(|r|>0.555,P<0.05).The specificity of Vm25-50/VT of VCap for the diagnosis of COPD was best,but its sensitivity was poor than other indexes of VCap.The indexes with both high sensitivity and high specificity were Vm50-75/VT and dC/dV3.Conclusions When the patients with COPD manifest the mild airflow limited,Vm25-50/VT,Vm50-75/VT,dC/dV3 and SR23 of VCap are gradually increased with abnormal VCap figures when the illness progressed.The CO2max of VCap might be one of the indexes for assessing the severity of severe or more severe COPD.
