Chronic Respiratory Disease

Background: The endurance shuttle walk test (ESWT) is a standardized externally controlled constant paced field test for the assessment of endurance capacity in chronic lung disease. The ESWT has been advocated as a simple, acceptable, repeatable and responsive outcome measure for COPD patients undergoing pulmonary rehabilitation, but has not been formally compared with the more commonly used field walking test, the six-minute walk (6MW). We aimed to determine: 1) the responsiveness of the ESWT in COPD patients attending a hospital-based pulmonary rehabilitation programme, and 2) to compare the responsiveness of the ESWT with the 6MW. Methods: Consecutive COPD patients, referred for a standard 8 week pulmonary rehabilitation programme, were recruited. Outcome parameters studied at baseline and completion of rehabilitation programme (8 weeks) included spirometric lung volumes, resting oxygen saturation, breathlessness scored pre and post exercise (modified Borg dyspnoea score), 6MW, ESWT, health-related quality of life (Chronic Respiratory Questionnaire) and Hospital Anxiety and Depression (HAD) scale. The incremental shuttle was employed to predict V0₂ peak; 85% V0₂ peak was used to determine the walk speed for the ESWT. Results: Twenty stable COPD patients (11 male), mean (SD), age 71, (9) FEV₁ 0.95 (0.51), resting SP⁰2 95% (2) 6MW distance (m) 351 (104) and ESWT distance (m) 313 (193) were studied. Three patients did not complete their rehabilitation programme. Following rehabilitation, there were significant improvements in 6MW, ESWT, total CRQ and anxiety domain (HAD). The 6MW distance increased by 17% (47 m 95%CI 3, 90), while the ESWT increased by 92% (302 m 95%CI 104, 501). Conclusion: The ESWT is a simple, acceptable and highly responsive outcome measure for COPD patients undergoing a pulmonary rehabilitation programme. The ESWT has potential advantages in that it may be more responsive than the 6MW.

A systematic review was conducted to examine the association between co-morbidity and physical performance in people with chronic obstructive pulmonary disease (COPD). MEDLINE, EMBASE, CINAHL, SCOPUS and Cochrane Central Register of Controlled Trials were searched from inception to end-February 2013, using keywords ‘COPD’, ‘exercise’, ‘physical activity’, ‘rehabilitation’, ‘co-morbidity’ and individual co-morbid conditions. Studies reporting associations of co-morbidities in COPD with at least one objective measure of physical performance were included. Study quality was appraised using the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) checklist. Nine studies met inclusion criteria. Mean (standard deviation (SD)) STROBE score was 16 (3) (maximum score = 21). Four studies examined anxiety as a co-morbid condition; three examined depression; two examined obesity and two examined a range of conditions. Reduced physical performance was associated with higher Charlson score (odds ratio (OR) = 0.72, 95% confidence interval (CI) = 0.54–0.98), metabolic disease (OR = 0.58, 95% CI = 0.49–0.67), anxiety (OR = 0.37, 95% CI = 0.23–0.59) and osteoporosis (OR = 0.28, 95% CI = 0.11–0.70). Depression had minimal association with physical performance but was associated with higher dropout rates from pulmonary rehabilitation programmes. Obesity was negatively associated with baseline physical performance but not with change from an exercise intervention. The presence of co-morbid conditions in people with COPD may negatively affect physical performance and should be identified and accounted for analysis of interventions.

Pulmonary rehabilitation programs (PRPs) are most commonly provided in hospital settings which present barriers to attendance such as long distances or travel times. Community-based settings have been used in an attempt to alleviate the travel burden. This study evaluated the feasibility and outcomes of a network of community-based PRPs provided in non-healthcare facilities (CPRPs). The CPRPs were established in five venues and comprised two supervised group sessions each week for 8 weeks. Participant inclusion criteria and guidelines for exercise testing and training were developed to reduce the risk of adverse events. Outcome measures included 6-min walk distance (6MWD) and health-related quality of life (chronic respiratory questionnaire (CRQ)). Respiratory-related hospital admission data were collected in the 12 months prior to and following the program. Two hundred and fifty-one participants (79% with chronic obstructive pulmonary disease: mean ± SD FEV₁ 49 ± 21%predicted) entered a CPRP of which 166 (66%) completed. Improvements were demonstrated in 6MWD (mean difference (95% CI) 44 m (37–52)) and total CRQ score (0.5 points per item (0.4–0.7)). Fewer participants had a respiratory-related hospital admission following the program (12% vs. 37%, p < 0.0001). Pulmonary rehabilitation is safe, feasible and effective when conducted in community-based non-healthcare facilities.

Exacerbations are a major cause of morbidity and mortality in patients with chronic obstructive pulmonary disease (COPD) as well as having a large impact on health care utilisation (HCU). They are more frequent during periods of cold weather with a corresponding increase in hospital admissions. It has been hypothesised that COPD exacerbations and admissions can be reduced by predicting periods of cold weather coupled with patients’ alerts and education. Healthy Outlook^® service provided by the Meteorological Office, UK, was used in patients with mild-to-moderate COPD who consented to participate from three primary care practices. Outcome measures included data relating to hospital admissions for acute exacerbations as well as HCU for these patients during the intervention period (1 Nov 2008-31 Mar 2009) and compared for the same patients and same period 12 months earlier (1 Nov 2007-31 Mar 2008). A cost analysis comparing treatment cost per patient for the two periods was also conducted. A total of 157 (34% of target COPD population) patients took part in the project, with five weather alerts generated (first alert reached 150 patients; second reached 146; third reached 138 patients; fourth reached 137 patients; and the fifth reached 125 patients) during the intervention period. There was a non-statistically-significant increase in hospital admissions per patient (0.07-0.076; p = 0.83). The number of general practice visits per patient dropped from 4.9 to 3.8 (p = 0.001), with drop in average number of visits to patients by out-of-hours services from 0.52-0.14 (p = 0.013). The average number of home consultations provided by general practice increased from 0.05 to 0.92 (p = 0.001). Cost per patient increased by an average of £142 (95% CI -£128 to £412). This anticipatory care model was not associated with reduction in admissions from COPD exacerbations. Further research is required to fully understand its role in the management of patients with COPD.

Chronic obstructive pulmonary disease (COPD) is a leading cause of death, morbidity, and health-care spending. The Halifax, Nova Scotia-based INSPIRED COPD Outreach Program™ has proved highly beneficial for patients and the health-care system. With direct investment of <$1-million CAD, a pan-Canadian quality improvement collaborative (QIC) supported the spread of INSPIRED to 19 teams in the 10 Canadian provinces contingent upon participation in evaluation. The collaborative evaluation followed a mixed-methods summative approach relying on collated quantitative data, team documents, and surveys sent to core members of the 19 teams. Survey questions included a series of multiple-choice responses, Likert scale ratings, and open-ended questions. The qualitative evaluation entailed key informant interviews and focus groups undertaken between February and April 2016 post-collaborative. Teams reported that the year-long QIC helped bring focus to a needed, though often overlooked area of improvement, facilitating innovation spread. They report examples of new work practices as well as unanticipated cultural change (given the short QIC time frame). Most teams gained new skills in quality improvement (QI) and evidence-based medicine, showing progress in their ability to measure and implement COPD care improvements. Teams felt networking with other teams across the country toward a common solution as well as learning from a team of clinical innovators and evidence-based innovation were critical to their success. Factors affecting sustainability included local leadership support, involvement of frontline clinicians, and sharing milestones to motivate continued QI. The INSPIRED QIC enabled teams across Canada to adapt and implement a new COPD care model for high users of health-care with rapid improvements to work practices, cultural change, and skill sets, and at relatively low cost.