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Imaging Features of Systemic Sclerosis-Associated Interstitial Lung Disease
Published on: June 16, 2020
Rheumatoid arthritis-associated interstitial lung disease
Joshua J Solomon1, Kevin K Brown1
1Autoimmune Lung Center and interstitial Lung Disease Program, National Jewish Health, Denver, CO, USA.
Rheumatoid arthritis can cause lung complications, including interstitial lung disease, particularly in smokers. This condition often presents with cough and shortness of breath, requiring treatment for progressive lung damage.
Area of Science:
- Rheumatology and Pulmonology
- Immunology and Genetics
Background:
- Rheumatoid arthritis (RA) is a systemic inflammatory condition affecting 1% of the US population, with common extra-articular involvement of the lungs.
- Interstitial lung disease (ILD) is a serious complication of RA, more frequent in smokers, males, and individuals with high antibody titers.
Approach:
- High-resolution computed tomography (HRCT) is utilized to assess lung involvement, revealing abnormalities in over half of RA patients.
- Pulmonary function tests commonly show reduced diffusion capacity for carbon monoxide (DLCO).
Key Points:
- The most frequent HRCT and histopathology pattern in RA-ILD is usual interstitial pneumonia (UIP), followed by nonspecific interstitial pneumonia.
- The pathogenesis is not fully understood but likely involves environmental factors and genetic predisposition, with smoking potentially triggering autoimmunity through protein citrullination.
- Patients typically present with cough and dyspnea in middle age.
Conclusions:
- RA-ILD is a progressive condition, with over half of patients exhibiting radiographic progression within two years.
- Treatment for severe or progressive RA-ILD involves corticosteroids, potentially with cytotoxic agents for at least six months.
- Prognosis for RA-ILD with a UIP pattern is comparable to idiopathic pulmonary fibrosis (IPF).
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