TY - JOUR
T1 - Parametric response mapping on chest computed tomography associates with clinical and functional parameters in chronic obstructive pulmonary disease
AU - Pompe, Esther
AU - Galban, Craig J.
AU - Ross, Brian D.
AU - Koenderman, Leo
AU - ten Hacken, Nick H. T.
AU - Postma, Dirkje S.
AU - van den Berge, Maarten
AU - de Jong, Pim A.
AU - Lammers, Jan-Willem J.
AU - Hoesein, Firdaus A. Mohamed
N1 - Copyright © 2016 Elsevier Ltd. All rights reserved.
PY - 2017/2
Y1 - 2017/2
N2 - Background: In the search for specific phenotypes of chronic obstructive pulmonary disease (COPD) computed tomography (CT) derived Parametric Response Mapping (PRM) has been introduced. This study evaluates the association between PRM and currently available biomarkers of disease severity in COPD.Methods: Smokers with and without COPD were characterized based on questionnaires, pulmonary function tests, body plethysmography, and low-dose chest CT scanning. PRM was used to calculate the amount of emphysema (PRMEmph) and non-emphysematous air trapping (i.e. functional small airway disease, PRMfSAD). PRM was first compared with other biomarkers for emphysema (Perc15) and air trapping (E/I-ratio(MLD)). Consequently, linear regression models were utilized to study associations of PRM measurements with clinical parameters.Results: 166 participants were included with a mean +/- SD age of 50.5 +/- 17.7 years. Both PRMEmph and PRMfSAD were more strongly correlated with lung function parameters as compared to Perc15 and E/I-ratio(MLD). PRMEmph and PRMfSAD were higher in COPD participants than non-COPD participants (14.0% vs. 1.1%, and 31.6% vs. 8.2%, respectively, both p <0.001) and increased with increasing GOLD stage (all p <0.001). Multivariate analysis showed that PRMfSAD was mainly associated with total lung capacity (TLC) (beta = -7.90, p <0.001), alveolar volume (VA) (beta = 7.79, p <0.001), and residual volume (beta = 6.78, p <0.001), whilst PRMEmph was primarily associated with Kco (beta = 8.95, p <0.001), VA (beta = -6.21, p <0.001), and TLC (beta = 6.20, p <0.001).Conclusions: PRM strongly associates with the presence and severity of COPD. PRM therefore appears to be a valuable tool in differentiating COPD phenotypes. (C) 2016 Elsevier Ltd. All rights reserved.
AB - Background: In the search for specific phenotypes of chronic obstructive pulmonary disease (COPD) computed tomography (CT) derived Parametric Response Mapping (PRM) has been introduced. This study evaluates the association between PRM and currently available biomarkers of disease severity in COPD.Methods: Smokers with and without COPD were characterized based on questionnaires, pulmonary function tests, body plethysmography, and low-dose chest CT scanning. PRM was used to calculate the amount of emphysema (PRMEmph) and non-emphysematous air trapping (i.e. functional small airway disease, PRMfSAD). PRM was first compared with other biomarkers for emphysema (Perc15) and air trapping (E/I-ratio(MLD)). Consequently, linear regression models were utilized to study associations of PRM measurements with clinical parameters.Results: 166 participants were included with a mean +/- SD age of 50.5 +/- 17.7 years. Both PRMEmph and PRMfSAD were more strongly correlated with lung function parameters as compared to Perc15 and E/I-ratio(MLD). PRMEmph and PRMfSAD were higher in COPD participants than non-COPD participants (14.0% vs. 1.1%, and 31.6% vs. 8.2%, respectively, both p <0.001) and increased with increasing GOLD stage (all p <0.001). Multivariate analysis showed that PRMfSAD was mainly associated with total lung capacity (TLC) (beta = -7.90, p <0.001), alveolar volume (VA) (beta = 7.79, p <0.001), and residual volume (beta = 6.78, p <0.001), whilst PRMEmph was primarily associated with Kco (beta = 8.95, p <0.001), VA (beta = -6.21, p <0.001), and TLC (beta = 6.20, p <0.001).Conclusions: PRM strongly associates with the presence and severity of COPD. PRM therefore appears to be a valuable tool in differentiating COPD phenotypes. (C) 2016 Elsevier Ltd. All rights reserved.
KW - Computed tomography
KW - Parametric response mapping
KW - Copd
KW - Phenotypes
KW - Emphysema
KW - Small airway disease
KW - EXERCISE CAPACITY
KW - FLOW LIMITATION
KW - LUNG-FUNCTION
KW - COPD
KW - EMPHYSEMA
KW - PHENOTYPES
KW - PROGRESSION
KW - STATEMENT
KW - SMOKERS
KW - FUTURE
U2 - 10.1016/j.rmed.2016.11.021
DO - 10.1016/j.rmed.2016.11.021
M3 - Article
C2 - 28137496
SN - 0954-6111
VL - 123
SP - 48
EP - 55
JO - Respiratory Medicine
JF - Respiratory Medicine
ER -