A comparison of visual and quantitative methods to identify interstitial lung abnormalities.

BMC Pulm Med 2015 Oct 29;15:134. Epub 2015 Oct 29.

From the Pulmonary and Critical Care Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.

Background: Evidence suggests that individuals with interstitial lung abnormalities (ILA) on a chest computed tomogram (CT) may have an increased risk to develop a clinically significant interstitial lung disease (ILD). Although methods used to identify individuals with ILA on chest CT have included both automated quantitative and qualitative visual inspection methods, there has been not direct comparison between these two methods. To investigate this relationship, we created lung density metrics and compared these to visual assessments of ILA.

Methods: To provide a comparison between ILA detection methods based on visual assessment we generated measures of high attenuation areas (HAAs, defined by attenuation values between -600 and -250 Hounsfield Units) in >4500 participants from both the COPDGene and Framingham Heart studies (FHS). Linear and logistic regressions were used for analyses.

Results: Increased measures of HAAs (in ≥ 10 % of the lung) were significantly associated with ILA defined by visual inspection in both cohorts (P < 0.0001); however, the positive predictive values were not very high (19 % in COPDGene and 13 % in the FHS). In COPDGene, the association between HAAs and ILA defined by visual assessment were modified by the percentage of emphysema and body mass index. Although increased HAAs were associated with reductions in total lung capacity in both cohorts, there was no evidence for an association between measurement of HAAs and MUC5B promoter genotype in the FHS.

Conclusion: Our findings demonstrate that increased measures of lung density may be helpful in determining the severity of lung volume reduction, but alone, are not strongly predictive of ILA defined by visual assessment. Moreover, HAAs were not associated with MUC5B promoter genotype.

Download full-text PDF

Source
http://dx.doi.org/10.1186/s12890-015-0124-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4625729PMC
October 2015
39 Reads

Publication Analysis

Top Keywords

ila defined
12
defined visual
12
interstitial lung
12
visual assessment
12
lung abnormalities
8
ila chest
8
promoter genotype
8
increased measures
8
haas associated
8
muc5b promoter
8
lung
8
lung density
8
visual inspection
8
methods identify
8
haas
6
ila
6
visual
6
methods
5
linear logistic
4
logistic regressions
4

References

(Supplied by CrossRef)

American Thoracic Society/European Respiratory Society International Multidisciplinary Consensus Classification of the Idiopathic Interstitial Pneumonias et al.
Am J Respir Crit Care Med 2002

TE King Jr et al.
Am J Respir Crit Care Med 2001

L Richeldi et al.
N Engl J Med 2014

TE King Jr et al.
N Engl J Med 2014

GM Hunninghake et al.
N Engl J Med 2014

RK Putman et al.
Am J Respir Crit Care Med 2014

K Tsushima et al.
Respir Med 2010

N Sverzellati et al.
Eur Respir J 2011

GR Washko et al.
N Engl J Med 2011

GM Hunninghake et al.
N Engl J Med 2013

DJ Lederer et al.
Am J Respir Crit Care Med 2009

Similar Publications