Risk factors for developing hypoxic respiratory failure in COPD
Received 24 April 2017
Accepted for publication 30 May 2017
Published 20 July 2017 Volume 2017:12 Pages 2095—2100
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Dr Richard Russell
Josefin Sundh,1 Magnus Ekström2
1Department of Respiratory Medicine, School of Medical Sciences, Örebro University, Örebro, 2Department of Clinical Sciences, Division of Respiratory Medicine and Allergology, Lund University, Lund, Sweden
Background: Hypoxemia is associated with worse outcomes in COPD. The aim of the study was to investigate the prevalence, incidence, and risk factors of hypoxic respiratory failure (HRF) in COPD.
Patients and methods: This was a longitudinal analysis of data from the Swedish National Register of COPD. HRF was defined as resting saturation ≤88% or long-term oxygen therapy. Risk factors for developing HRF were analyzed using multiple logistic regression and receiver operating characteristic curve analysis.
Results: A total of 3,061 patients were included; mean forced expiratory volume in 1 second was 1.47 L; mean age was 70 years; and 54% were females. Median follow-up time was 1.8 years (interquartile range 1.3–2.4 years). HRF was present in 43 (1.4%) patients at baseline and 74 (2.4%) patients at follow-up. Among patients without HRF at baseline, 49 (1.6%) developed HRF during follow-up. The risk was highest for patients in Global initiative for Chronic Obstructive Lung Disease (GOLD) 2017 stage IV or groups C or D at baseline. Developing HRF was independently predicted by lower forced expiratory volume in 1 second and lower COPD Assessment Test score, with a c-statistic of 0.84 (95% CI, 0.70–0.91). When the multivariable model used the GOLD 2017 variables stages I–IV and the dichotomized variables frequent exacerbations and COPD Assessment Test ≥10; the c-statistic increased slightly to 0.86 (95% CI, 0.80–0.92; P<0.0001).
Conclusion: In patients with COPD, the prevalence and incidence of HRF was low and was predicted well by more severe air flow limitation and worse health status. The risk is highest in patients with GOLD stage IV and GOLD groups C or D.
Keywords: COPD, hypoxic respiratory failure, longitudinal analysis, risk factors, GOLD 2017 assessment tool, hypoxemia, lung function, health status
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