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Hypo- and hypercapnia predict mortality in oxygen-dependent chronic obstructive pulmonary disease: a population-based prospective study

Ahmadi, Zainab; Bornefalk-Hermansson, Anna; Franklin, Karl A.; Midgren, Bengt LU and Ekström, Magnus LU (2014) In Respiratory Research 15.
Abstract
Background: The prognostic role of the arterial blood gas tension of carbon dioxide (PaCO2) in severe Chronic Obstructive Pulmonary Disease (COPD) remains unknown. The aim of this study was to estimate the association between PaCO2 and mortality in oxygen-dependent COPD. Methods: National prospective study of patients starting long-term oxygen therapy (LTOT) for COPD in Sweden between October 1, 2005 and June 30, 2009, with all-cause mortality as endpoint. The association between PaCO2 while breathing air, PaCO2 (air), and mortality was estimated using Cox regression adjusted for age, sex, arterial blood gas tension of oxygen (PaO2), World Health Organization performance status, body mass index, comorbidity, and medications. Results: Of... (More)
Background: The prognostic role of the arterial blood gas tension of carbon dioxide (PaCO2) in severe Chronic Obstructive Pulmonary Disease (COPD) remains unknown. The aim of this study was to estimate the association between PaCO2 and mortality in oxygen-dependent COPD. Methods: National prospective study of patients starting long-term oxygen therapy (LTOT) for COPD in Sweden between October 1, 2005 and June 30, 2009, with all-cause mortality as endpoint. The association between PaCO2 while breathing air, PaCO2 (air), and mortality was estimated using Cox regression adjusted for age, sex, arterial blood gas tension of oxygen (PaO2), World Health Organization performance status, body mass index, comorbidity, and medications. Results: Of 2,249 patients included, 1,129 (50%) died during a median 1.1 years (IQR 0.6-2.0 years) of observation. No patient was lost to follow-up. PaCO2 (air) independently predicted adjusted mortality (p < 0.001). The association with mortality was U-shaped, with the lowest mortality at approximately PaCO2 (air) 6.5 kPa and increased mortality at PaCO2 (air) below 5.0 kPa and above 7.0 kPa. Conclusion: In oxygen-dependent COPD, PaCO2 (air) is an independent prognostic factor with a U-shaped association with mortality. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
COPD, LTOT, Mortality, PaCO2, Hypercapnia, Carbon dioxide, Respiratory, failure, Survival
in
Respiratory Research
volume
15
publisher
BioMed Central
external identifiers
  • wos:000334703500001
  • scopus:84899077673
ISSN
1465-9921
DOI
10.1186/1465-9921-15-30
language
English
LU publication?
yes
id
5767238f-1cc9-49b3-88d2-c0f9233b75ee (old id 4495807)
date added to LUP
2014-07-01 07:35:09
date last changed
2017-08-20 03:13:52
@article{5767238f-1cc9-49b3-88d2-c0f9233b75ee,
  abstract     = {Background: The prognostic role of the arterial blood gas tension of carbon dioxide (PaCO2) in severe Chronic Obstructive Pulmonary Disease (COPD) remains unknown. The aim of this study was to estimate the association between PaCO2 and mortality in oxygen-dependent COPD. Methods: National prospective study of patients starting long-term oxygen therapy (LTOT) for COPD in Sweden between October 1, 2005 and June 30, 2009, with all-cause mortality as endpoint. The association between PaCO2 while breathing air, PaCO2 (air), and mortality was estimated using Cox regression adjusted for age, sex, arterial blood gas tension of oxygen (PaO2), World Health Organization performance status, body mass index, comorbidity, and medications. Results: Of 2,249 patients included, 1,129 (50%) died during a median 1.1 years (IQR 0.6-2.0 years) of observation. No patient was lost to follow-up. PaCO2 (air) independently predicted adjusted mortality (p &lt; 0.001). The association with mortality was U-shaped, with the lowest mortality at approximately PaCO2 (air) 6.5 kPa and increased mortality at PaCO2 (air) below 5.0 kPa and above 7.0 kPa. Conclusion: In oxygen-dependent COPD, PaCO2 (air) is an independent prognostic factor with a U-shaped association with mortality.},
  articleno    = {30},
  author       = {Ahmadi, Zainab and Bornefalk-Hermansson, Anna and Franklin, Karl A. and Midgren, Bengt and Ekström, Magnus},
  issn         = {1465-9921},
  keyword      = {COPD,LTOT,Mortality,PaCO2,Hypercapnia,Carbon dioxide,Respiratory,failure,Survival},
  language     = {eng},
  publisher    = {BioMed Central},
  series       = {Respiratory Research},
  title        = {Hypo- and hypercapnia predict mortality in oxygen-dependent chronic obstructive pulmonary disease: a population-based prospective study},
  url          = {http://dx.doi.org/10.1186/1465-9921-15-30},
  volume       = {15},
  year         = {2014},
}