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Abstract
INTRODUCTION Many forms of interstitial lung disease (ILD) can progress to extensive fibrosis and respiratory failure. Idiopathic pulmonary fibrosis (IPF), which generally has a poor prognosis, has been thoroughly studied over the past two decades, and many important discoveries have been made that pertain to genetic predisposition, epidemiology, disease pathogenesis, diagnosis, and management. Additionally, non-IPF forms of ILD can have radiologic and histopathologic manifestations that mimic IPF, and making an accurate diagnosis is key to providing personalized medicine to patients with pulmonary fibrosis. Areas covered: This manuscript discusses current knowledge pertaining to the genetics, epidemiology, pathogenesis, and diagnosis of pulmonary fibrosis with an emphasis on IPF. The material upon which this discussion is based was obtained from various published texts and manuscripts identified via literature searching (e.g. PubMed). Expert commentary: Many genetic variants have been identified that are associated with risk of developing pulmonary fibrosis, and an improved understanding of the influence of both genomic and epigenomic factors in the development of pulmonary fibrosis is rapidly evolving. Because many forms of fibrosing ILD can have similar radiologic and histopathologic patterns yet have different responses to therapeutic interventions, making an accurate diagnosis of specific forms of pulmonary fibrosis is increasingly important.
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Affiliation(s)
- Keith C Meyer
- a Department of Medicine , University of Wisconsin School of Medicine and Public Health - Medicine , Madison , WI , United States
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102
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Drummond MB, Lambert AA, Hussien AF, Lin CT, Merlo CA, Wise RA, Kirk GD, Brown RH. HIV Infection Is Independently Associated with Increased CT Scan Lung Density. Acad Radiol 2017; 24:137-145. [PMID: 27876271 PMCID: PMC5237394 DOI: 10.1016/j.acra.2016.09.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 09/29/2016] [Accepted: 09/30/2016] [Indexed: 11/20/2022]
Abstract
RATIONALE AND OBJECTIVES Noninfectious pulmonary complications are common among HIV-infected individuals and may be detected early by quantitative computed tomography (CT) scanning. The association of HIV disease markers with CT lung density measurement remains poorly understood. MATERIALS AND METHODS One hundred twenty-five participants free of spirometry-defined lung disease were recruited from a longitudinal cohort study of HIV-infected and HIV-uninfected individuals to undergo standardized CT scan of the chest. Parenchymal density for the entire lung volume was calculated using computerized software. Qualitative assessment of CT scans was conducted by two radiologists masked to HIV status. Linear regression models were developed to determine the independent association of markers of HIV infection on inspiratory scan mean lung density (MLD). RESULTS HIV-infected participants had a significantly higher MLD (denser lung) compared to HIV-uninfected participants (-815 Hounsfield unit [HU] vs -837 HU; P = 0.002). After adjusting for relevant covariates, HIV infection was independently associated with 19.9 HU higher MLD (95% CI 6.04 to 33.7 HU; P = 0.005). In qualitative assessment, only ground glass attenuation and cysts were noted more commonly among HIV-infected individuals compared to HIV-uninfected individuals (34% vs 17% [P = 0.045] and 27% vs 10% [P = 0.03], respectively). No qualitative radiographic abnormalities attenuated the association between HIV infection and increased MLD. CONCLUSIONS HIV infection is independently associated with increased lung density. Although qualitative CT abnormalities were common in this cohort, only ground glass attenuation and cysts were noted more frequently in HIV-infected participants, suggesting that the increased lung density observed among HIV-infected individuals may be associated with subclinical inflammatory lung changes.
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Affiliation(s)
- M Bradley Drummond
- Department of Medicine, University of North Carolina at Chapel Hill School of Medicine, 125 Mason Farm Road, CB# 7248, Chapel Hill, North Carolina 27599.
| | - Allison A Lambert
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Amira F Hussien
- Department of Radiology, Johns Hopkins University, Baltimore, Maryland
| | - Cheng T Lin
- Department of Radiology, Johns Hopkins University, Baltimore, Maryland
| | - Christian A Merlo
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Robert A Wise
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Gregory D Kirk
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Robert H Brown
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland; Department of Radiology, Johns Hopkins University, Baltimore, Maryland; Department of Environmental Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland; Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University, Baltimore, Maryland
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103
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Bernstein EJ, Barr RG, Austin JHM, Kawut SM, Raghu G, Sell JL, Hoffman EA, Newell JD, Watts JR, Nath PH, Sonavane SK, Bathon JM, Majka DS, Lederer DJ. Rheumatoid arthritis-associated autoantibodies and subclinical interstitial lung disease: the Multi-Ethnic Study of Atherosclerosis. Thorax 2016; 71:1082-1090. [PMID: 27609750 DOI: 10.1136/thoraxjnl-2016-208932] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/21/2016] [Accepted: 07/27/2016] [Indexed: 01/28/2023]
Abstract
BACKGROUND Adults with interstitial lung disease (ILD) often have serologic evidence of autoimmunity of uncertain significance without overt autoimmune disease. We examined associations of rheumatoid arthritis (RA)-associated antibodies with subclinical ILD in community-dwelling adults. METHODS We measured serum rheumatoid factor (RF) and anticyclic citrullinated peptide antibody (anti-CCP) and high attenuation areas (HAAs; CT attenuation values between -600 and -250 Hounsfield units) on cardiac CT in 6736 community-dwelling US adults enrolled in the Multi-Ethnic Study of Atherosclerosis. We measured interstitial lung abnormalities (ILAs) in 2907 full-lung CTs at 9.5-year median follow-up. We used generalised linear and additive models to examine associations between autoantibodies and both HAA and ILA, and tested for effect modification by smoking. RESULTS In adjusted models, HAA increased by 0.49% (95% CI 0.11% to 0.86%) per doubling of RF IgM and by 0.95% (95% CI 0.50% to 1.40%) per RF IgA doubling. ILA prevalence increased by 11% (95% CI 3% to 20%) per RF IgA doubling. Smoking modified the associations of both RF IgM and anti-CCP with both HAA and ILA (interaction p values varied from 0.01 to 0.09). Among ever smokers, HAA increased by 0.81% (95% CI 0.33% to 1.30%) and ILA prevalence increased by 14% (95% CI 5% to 24%,) per RF IgM doubling; and HAA increased by 1.31% (95% CI 0.45% to 2.18%) and ILA prevalence increased by 13% (95% CI 2% to 24%) per anti-CCP doubling. Among never smokers, no meaningful associations were detected. CONCLUSIONS RA-related autoimmunity is associated with both quantitative and qualitative subclinical ILD phenotypes on CT, particularly among ever smokers.
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Affiliation(s)
- Elana J Bernstein
- Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - R Graham Barr
- Department of Medicine, Columbia University Medical Center, New York, New York, USA.,Department of Epidemiology, Columbia University Medical Center, New York, New York, USA
| | - John H M Austin
- Department of Radiology, Columbia University Medical Center, New York, New York, USA
| | - Steven M Kawut
- Department of Medicine and Center for Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Ganesh Raghu
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Jessica L Sell
- Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Eric A Hoffman
- Department of Radiology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - John D Newell
- Department of Radiology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Jubal R Watts
- Department of Radiology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
| | - P Hrudaya Nath
- Department of Radiology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
| | - Sushil K Sonavane
- Department of Radiology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
| | - Joan M Bathon
- Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Darcy S Majka
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - David J Lederer
- Department of Medicine, Columbia University Medical Center, New York, New York, USA.,Department of Epidemiology, Columbia University Medical Center, New York, New York, USA
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