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Title: | The association between normal lung function and peak oxygen uptake in patients with exercise intolerance and coronary artery disease | Authors: | Rasch-Halvorsen, Oystein Hassel, Erlend Brumpton, Ben M. Jenssen, Haldor SPRUIT, Martijn A. Langhammer, Arnulf Steinshamn, Sigurd |
Issue Date: | 2020 | Publisher: | PUBLIC LIBRARY SCIENCE | Source: | PLOS ONE, 15 (5) (Art N° e0232693) | Abstract: | In coronary artery disease (CAD), exercise intolerance with reduced oxygen uptake at peak exercise (VO2peak) is assumed to primarily reflect cardiovascular limitation. However, oxygen transport and utilization depends on an integrated organ response, to which the normal pulmonary system may influence overall capacity. This study aimed to investigate the associations between normal values of lung function measures and VO2peak in patients with exercise intolerance and CAD. We hypothesized that forced expiratory lung volume in one second (FEV1), transfer factor of the lung for carbon monoxide (TLCO) and TLCO/alveolar volume (TLCO/VA) above lower limits of normal (LLN) are associated with VO2peak in these patients. We assessed patients with established CAD (n = 93; 21 women) referred for evaluation due to exercise intolerance from primary care to a private specialist clinic in Norway. Lung function tests and cardiopulmonary exercise testing (CPET) were performed. Z-scores of FEV1, FEV1/forced vital capacity (FVC), TLCO and TLCO/VA were calculated using the Global Lung Function Initiative (GLI) software and LLN was defined as the fifth percentile (z = -1.645). Non-obstructive patients, defined by both FEV1 and FEV1/FVC above LLN, were assessed. The associations of FEV1Z-score, TLCOZ-score and TLCO/VA(Z-score) above LLN with VO2peak were investigated using linear regression models. Mean VO2peak +/- standard deviation (SD) was 23.8 +/- 6.4 ml/kg/min in men and 19.7 +/- 4.4 ml/kg/min in women. On average, one SD increase in FEV1, TLCO and TLCO/VA were associated with 1.4 (95% CI 0.2, 2.6), 2.6 (95% CI 1.2, 4.0) and 1.3 (95% CI 0.2, 2.5) ml/kg/min higher VO2peak, respectively. In non-obstructive patients with exercise intolerance and CAD, FEV1, TLCO and TLCO/VA above LLN are positively associated with VO2peak. This may imply a clinically significant influence of normal lung function on exercise capacity in these patients. | Notes: | Rasch-Halvorsen, O (corresponding author), Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Circulat & Med Imaging, NTNU, Trondheim, Norway.; Rasch-Halvorsen, O (corresponding author), Trondheim Reg & Univ Hosp, St Olavs Hosp, Clin Thorac & Occupat Med, Trondheim, Norway. oystein.rasch-halvorsen@ntnu.no |
Other: | Rasch-Halvorsen, O (corresponding author), Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Circulat & Med Imaging, NTNU, Trondheim, Norway; Trondheim Reg & Univ Hosp, St Olavs Hosp, Clin Thorac & Occupat Med, Trondheim, Norway. oystein.rasch-halvorsen@ntnu.no | Keywords: | Heart-Failure;Capacity;Abnormalities;Spirometry | Document URI: | http://hdl.handle.net/1942/31797 | ISSN: | 1932-6203 | e-ISSN: | 1932-6203 | DOI: | 10.1371/journal.pone.0232693 | ISI #: | WOS:000536959700053 | Rights: | © 2020 Rasch-Halvorsen et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2021 |
Appears in Collections: | Research publications |
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Halvorsen_2020_0232693.pdf | Published version | 417.58 kB | Adobe PDF | View/Open |
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