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From COPD epidemiology to studies of pathophysiological disease mechanisms: challenges with regard to study design and recruitment process
Department of Public Health and Clinical Medicine, Division of Medicine, Umeå University, Umeå.
Department of Public Health and Clinical Medicine, Division of Medicine, Umeå University, Umeå.ORCID iD: 0000-0003-4266-1782
Department of Public Health and Clinical Medicine, Division of Occupational and Environmental Medicine, Umeå University, Umeå.ORCID iD: 0000-0002-0553-8067
Department of Public Health and Clinical Medicine, Division of Medicine, Umeå University, Umeå.
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2017 (English)In: European Clinical Respiratory Journal, ISSN 2001-8525, Vol. 4, no 1, article id 1415095Article in journal (Refereed) Published
Abstract [en]

Background: Chronic obstructive pulmonary disease (COPD) is a largely underdiagnosed disease including several phenotypes. In this report, the design of a study intending to evaluate the pathophysiological mechanism in COPD in relation to the specific phenotypes non-rapid and rapid decline in lung function is described together with the recruitment process of the study population derived from a population based study. Method: The OLIN COPD study includes a population-based COPD cohort and referents without COPD identified in 2002-04 (n = 1986), and thereafter followed annually since 2005. Lung function decline was estimated from baseline in 2002-2004 to 2010 (first recruitment phase) or to 2012/2013 (second recruitment phase). Individuals who met the predefined criteria for the following four groups were identified; group A) COPD grade 2-3 with rapid decline in FEV1 and group B) COPD grade 2-3 without rapid decline in FEV1 (≥60 and ≤30 ml/year, respectively), group C) ever-smokers, and group D) non-smokers with normal lung function. Groups A-C included ever-smokers with >10 pack years. The intention was to recruit 15 subjects in each of the groups A-D. Results: From the database groups A-D were identified; group A n = 37, group B n = 29, group C n = 41, and group D n = 55. Fifteen subjects were recruited from groups C and D, while this goal was not reached in the groups A (n = 12) and B (n = 10). The most common reasons for excluding individuals identified as A or B were comorbidities contraindicating bronchoscopy, or inflammatory diseases/immune suppressive medication expected to affect the outcome. Conclusion: The study is expected to generate important results regarding pathophysiological mechanisms associated with rate of decline in lung function among subjects with COPD and the in-detail described recruitment process, including reasons for non-participation, is a strength when interpreting the results in forthcoming studies.

Place, publisher, year, edition, pages
Taylor & Francis, 2017. Vol. 4, no 1, article id 1415095
National Category
Physiotherapy
Research subject
Physiotherapy
Identifiers
URN: urn:nbn:se:ltu:diva-67180DOI: 10.1080/20018525.2017.1415095PubMedID: 29296255OAI: oai:DiVA.org:ltu-67180DiVA, id: diva2:1171477
Note

Validerad;2018;Nivå 2;2018-01-08 (svasva)

Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-04-24Bibliographically approved

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