Prevalence of asthma–COPD overlap syndrome among primary care asthmatics with a smoking history: a cross-sectional study View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2015-12

AUTHORS

Toni Kiljander, Timo Helin, Kari Venho, Antero Jaakkola, Lauri Lehtimäki

ABSTRACT

BACKGROUND: The overlap between asthma and chronic obstructive pulmonary disease (COPD) is an important clinical phenomenon. However, the prevalence of asthma-COPD overlap syndrome (ACOS) is not known. AIMS: To investigate the prevalence of ACOS among asthmatic patients with a smoking history, and evaluate the factors predicting ACOS in this patient group. METHODS: We investigated 190 primary care asthma patients with no previous diagnosis of COPD, but who were either current or ex-smokers, with a smoking history of at least 10 pack-years. Spirometry was performed on all the patients while they were taking their normal asthma medication. Patients were considered to have ACOS if their postbronchodilator forced expiratory volume in 1 s/forced vital capacity was < 0.70. RESULTS: Fifty-two (27.4%) of the patients were found to have ACOS. Age ⩾ 60 years and smoking for ⩾ 20 pack-years were the best predictors of ACOS. If both of these criteria were met, the odds ratio (95% confidence interval) for ACOS was 6.08 (2.11-17.49), compared with the situation where neither of these criteria were fulfilled. CONCLUSIONS: There is a high prevalence of ACOS among primary health care asthmatics with a positive smoking history but no previous diagnosis of COPD. In this population, age over 60 years and a smoking history of more than 20 pack-years were the best predictors of ACOS. More... »

PAGES

15047

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/npjpcrm.2015.47

DOI

http://dx.doi.org/10.1038/npjpcrm.2015.47

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1010156666

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/26182124


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