Recently, many researchers paid more attentions to the association between air pollution and chronic obstructive pulmonary disease (COPD). Haze, a severe form of outdoor air pollution, affected most parts of northern and eastern China in the past winter. In China, studies have been performed to evaluate the impact of outdoor air pollution and biomass smoke exposure on COPD; and most studies have focused on the role of air pollution in acutely triggering symptoms and exacerbations. Few studies have examined the role of air pollution in inducing pathophysiological changes that characterise COPD. Evidence showed that outdoor air pollution affects lung function in both children and adults and triggers exacerbations of COPD symptoms. Hence outdoor air pollution may be considered a risk factor for COPD mortality. However, evidence to date has been suggestive (not conclusive) that chronic exposure to outdoor air pollution increases the prevalence and incidence of COPD. Cross-sectional studies showed biomass smoke exposure is a risk factor for COPD. A long-term retrospective study and a long-term prospective cohort study showed that biomass smoke exposure reductions were associated with a reduced decline in forced expiratory volume in 1 second (FEV1) and with a decreased risk of COPD. To fully understand the effect of air pollution on COPD, we recommend future studies with longer follow-up periods, more standardized definitions of COPD and more refined and source-specific exposure assessments.
Objective To determine the efficacy of forced expiratory volume in six seconds( FEV6 ) as an alternative for forced vital capacity( FVC) in the diagnosis for mild-moderate chronic obstructive pulmonary disease( COPD) .Methods A total of 402 mild-moderate COPD and 217 non-COPD patients’ spirometric examinations were retrospectively analyzed. The correlation between FEV6 and FVC, FEV1 /FVC and FEV1 /FEV6 was evaluated by the Spearman test. Considering FEV1 /FVC lt;70% as being the ‘golden standard’ for airway obstruction, a ROC curve was used to determine the best cut-off point for the FEV1 /FEV6 ratio in the diagnosis for COPD. Results The Spearman correlation test revealed the FEV1 and FEV6 , FEV1 /FEV6 and FEV1 /FVC ratios were highly correlated ( r = 0. 992, 0. 980, respectively, P = 0. 000) . Using FEV1 /FEV6 lt; 70% as the diagnosis standard, 12. 69% of the 402 patients could not be diagnosed as COPD. The FEV1 /FVC ratio of these patients was very close to 70% . The best cut-off point for the FEV1 /FEV6 ratio in the diagnosis of mild-moderate COPD was 72% while the sensitivity and specificity were 94. 7% and 92. 2% , respectively. Conclusions There is a b correlation between FEV1 /FVC and FEV1 /FEV6 . The FEV6 can be a valid alternative for FVC in the diagnosis for mild-moderate COPD, although it may result in false negative. The best cut-off point for the FEV1 /FEV6 ratio is 72% .
Objective To analyze the influence of COPD on the structure and function of left ventricular. Methods Sixty-nine COPD patients ( mean age: 69. 0 ±7. 8 yrs) and forty healthy controls ( mean age: 67. 8 ±7. 6 yrs) were enrolled in this study. Both groups underwent Doppler echocardiography.Heart rate ( HR) were recorded. Left ventricular end-diastolic volume ( LVEDV) , left ventricular enddiastolic diameter ( LVEDD) , interventricular septum( IVS) , stroke volume ( SV) , and cardiac output ( CO)were measured. The changes of left ventricular were compared between the COPD patients and the healthy controls, and also between the COPD patients with or without chronic cor pulmonale. Results Compared with the healthy controls, movement range of IVS, LVEDD, LVEDV, and SV reduced significantly ( P lt;0. 05) , and HR raised significantly in the COPD patients ( P lt; 0. 05) . CO had no significant difference between two groups ( P gt;0. 05) . Sub-group analysis indicated that the thickness and movement range of IVSwere greater in the patients with cor pulmonale secondary to COPD than those without cor pulmonale ( P lt;0. 05) . Conclusions In COPD patients, left ventricular chamber size decreases, and left ventricular systolic function is impaired. Left ventricular function is impaired more severe in cor pulmonale secondary to COPD than COPD without cor pulmonale.
Objective To explore the predictive value of serum procalcitonin (PCT), D-dimer (D-D) and decoy receptor 3 (DcR3) for prognosis of patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD) and respiratory failure undergoing non-invasive ventilation (NIV). Methods A total of 95 patients with AECOPD and respiratory failure undergoing basic treatment and NIV in the hospital were retrospectively enrolled between September (n=65) 2017 and February 2021. According to prognosis after treatment, they were divided into a good prognosis group and a poor prognosis group (n=30). The general data of all patients were collected. The influencing factors of prognosis were analyzed by multivariate logistic regression model. The levels of DcR3, PCT and D-D were detected by enzyme-linked immunosorbent assay, colloidal gold colorimetry and immunoturbidimetry. The patients condition was assessed by scores of acute physiology chronic health evaluation scoring system Ⅱ (APACHEⅡ). The partial pressure of arterial oxygen (PaO2) and partial pressure of carbon dioxide (PaCO2) were recorded. And the above indexes between the two groups were compared. The relationship between DcR3, PCT, D-D and APACHEⅡ score, PaO2, PaCO2 was analyzed by Pearson correlation analysis. The prognostic value of DcR3, PCT and D-D was analyzed by receiver operating characteristic (ROC) curve. Results There was no significant difference in gender, GOLD grading or underlying diseases between the poor prognosis group and the good prognosis group (P>0.05), but there were significant differences in age, DcR3, PCT, D-D, APACHEⅡ score, PaO2 and PaCO2 after treatment (P<0.05). DcR3, PCT, D-D, APACHEⅡ score and PaCO2 in the poor prognosis group were higher than those in the good prognosis group, while PaO2 was lower than that in the good prognosis group (P<0.05). Logistic regression analysis showed that DcR3 ≥5.50 ng/mL (OR=21.889), PCT ≥ 5.00 μg/L (OR=3.782), D-D ≥3.00 μg/L (OR=4.162) and APACHEⅡ score ≥20 points (OR=2.540) were all influencing factors of prognosis (P<0.05). The results of Pearson correlation analysis showed that DcR3, PCT and D-D were positively correlated with APACHEⅡ score and PaCO2, while negatively correlated with PaO2 (P<0.05). The results of ROC curve analysis showed that area under ROC curve of DcR3, PCT and D-D for predicting the prognosis were 0.745 (95%CI 0.631 - 0.859), 0.691 (95%CI 0.579 - 0.803) and 0.796 (95%CI 0.696 - 0.895), respectively (P<0.05). Conclusion The serum DcR3, PCT and D-D levels are related to disease progression in patients with AECOPD and respiratory failure after NIV, which have good predictive efficiency for prognosis and can be applied as important biological indexes to evaluate prognosis and guide treatment.
Objective To evaluate the effects of different ways of exercise training on elderly patients with chronic obstructive pulmonary disease ( COPD) , which focuse on the changes of cardiopulmonary exercise function and COPD symptoms. Methods 54 cases of elderly patients with stable COPD were randomly allocated to a control ( 15 cases) , a lower-limb ( 20 cases) , or a upper-Limb and lower-Limb combined exercise group ( 19 cases) . All patients received conventional medical therapy.Meanwhile, the exercise groups received training for 16 weeks. The improvements of resting spirometry,cardiopulmonary exercise test ( CPET) , and dyspnea ( Borg scale rating) were evaluated before and after the training scheme. Results There was no significant difference in resting spirometry after exercise training( P gt;0. 05) . Exercise tolerance and Borg scale were improved in both exercise groups significantly than baseline ( P gt;0. 05) and the control group ( P gt;0. 05) . VE@ 50% Vo2max was improved significantly in the combined group( 4. 81 ±0. 70 vs. 2. 49 ±1. 15, P lt; 0. 001) . Breathing reserve ( BR) was elevated in bothexercise groups than the control ( P lt; 0. 01) , and the improvement in the combined group was more significant ( 9. 79 ±1. 57 vs. - 1. 36 ±2. 82, P lt; 0. 001) . Gas exchange response ( VD /VT ) was slightly improved after rehabilitation in the combined group( P lt;0. 05) . Borg scale after rehabilitation was correlatedwith FEV1% pred, BR, and Vo2 /kg after rehabilitation[ Borg = 9. 516 - 0. 174 ×FEV1% pred - 0. 156 × (Vo2 /kg) - 0. 023 ×BR] . Conclusions Upper-limb combined with lower-limb exercise training can markedly improve the level of aerobic capacity and ventilation in elderly patients with stable COPD, and then improve the exercise tolerance.
Objective To investigate the serum level of surfactant protein D ( SP-D) in patients with chronic obstructive pulmonary disease ( COPD) and its clinical significance. Methods Serumlevels of SP-D in patients with acute exacerbations of COPD ( n = 29) , stable COPD ( n = 26) , and control subjects ( n = 19 ) were measured by ELISA. Multiple regression modeling was performed to determine the independent relationship between SP-D and lung function variables. Results The serum SP-D levels were significantly increased in the patients who experienced an acute exacerbation [ ( 70. 6 ±20. 7) ng/mL] compared with the patients with stable COPD and the control subjects [ ( 47. 9 ±13. 3) ng/mL and ( 31. 2 ±11. 4) ng/mL] ( both P lt; 0. 01) . The serum SP-D levels in the patients with stable COPD increased significantly than the control subjects ( P lt; 0. 01) . Smoking index and staging of COPD were positively related to SP-D level. Serum SP-D levels were also found to be inversely related to FEV1% pred in stable COPD. Conclusion Serum SP-D may be a potential diagnostic and staging biomarker for COPD.
ObjectiveTo evaluate the effect of perioperative nebulization of ipratropium bromide on preoperative pulmonary function and incidence of postoperative pulmonary complications as well as safety in chronic obstructive pulmonary disease (COPD) patients who underwent lung resection in thoracic surgery. MethodsDuring November 18, 2013 to August 12, 2015, 192 COPD patients with a necessity of selective surgical procedures of lobectomy or right bilobectomy or segmentectomy under general anaesthesia in 10 centers were 1 : 1 randomized to an ipratropium bromide group (96 patients) and a placebo group (96 patients), to compare the effect on preoperative pulmonary function and incidence of postoperative pulmonary complications. The average age of treated patients was 62.90±6.50 years, with 168 male patients and 22 female patients. Results The demographic and baseline characteristics were well-balanced between the two groups. The adjusted mean increase of forced expiratory volume in one second (FEV1) in the ipratropium bromide group was significantly higher than that in the placebo group (169.90±29.07 mL vs. 15.00±29.35 mL, P<0.05). The perioperative use of ipratropium bromide significantly decreased incidence of postoperative pneumonia (2.6% vs. 14.1%, P<0.05). There was no ipratropium bromide related adverse event (AE) observed in this trial. ConclusionThis trial indicates that perioperative nebulization of ipratropium bromide significantly improves preoperative lung function and reduces postoperative pneumonia in COPD patients undergoing lung resection in thoracic surgery, and has good safety profile.
The Global Strategy for the Diagnosis, Management and Prevention of Chronic Obstructive Pulmonary Disease is produced based on important studies published in last five years and published online. So far it is the most influential evidence-based strategy for the diagnosis, treatment and prevention of chronic obstructive pulmonary disease to guide clinical professionals.
ObjectiveTo investigate the relationship between chronic obstructive pulmonary disease (COPD) and respiratory failure in patients with upper gastrointestinal bleeding and recent prognosis. MethodsWe retrospectively analyzed the clinical data of 73 patients with COPD and respiratory failure treated from February 2009 to May 2011. The patients were assigned to the observing group (n=33) and control group (n=40). General characteristics, improvement rates, mortality rates, lengths of hospital stay, endotracheal tube rates and arrhythmia rates were compared between the two groups. ResultsAge, sex, and medical history of the patients were similar in both groups (P>0.05). Compared with the control group, the improvement rate was lower (P<0.001), the mortality rate (P<0.001), length of hospital stay (P<0.001), endotracheal tube rate (P<0.05) and arrhythmia rate (P<0.05) were all higher in the observing group after treatment. ConclusionUpper gastrointestinal bleeding is a high risk factor for short-term prognosis patients with COPD and respiratory failure.