Journal List > J Rheum Dis > v.23(2) > 1064247

Kim, Lee, Choe, Hwang, Park, Lee, and Kim: Factors Associated with Airway Disease and Interstitial Lung Disease in Rheumatoid Arthritis

Abstract

Objective

This study examined lung involvement in patients with rheumatoid arthritis (RA) and identified factors associated with airway disease (AD) and interstitial lung disease (ILD).

Methods

A total of 507 RA patients were enrolled in a cross-sectional study. Lung involvement was assessed by high-resolution computed tomography scan. The patient groups were classified according to normal, AD, and ILD. Multinomial logistic regression analysis was performed to identify factors associated with AD and ILD.

Results

The most frequent lung involvement was AD (38.3%) followed by ILD (12.6%). Old age (adjust odds ratio [aOR] 2.58, 95% confidence interval [CI] 1.70 to 3.90 for AD; aOR 4.38, 95% CI 2.30 to 8.35 for ILD), male gender (aOR 2.57, 95% CI 1.22 to 5.42 for AD; aOR 5.48, 95% CI 2.20 to 13.65 for ILD) were factors associated with AD and ILD in RA patients. ILD was associated with short disease duration (aOR 0.30, 95% CI 0.14 to 0.62), AD was associated with high titers of anticyclic citrullinated peptides antibodies (anti-CCP; aOR 1.61, 95% CI 1.07 to 2.44).

Conclusion

AD was the most frequent lung involvement in patients with RA. Old age and male gender were both associated with AD and ILD. Short disease duration was associated with ILD. High titers of anti-CCP was associated with AD.

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Table 1.
Generalized characteristics of enrolled patients
Characteristic Total (n=507)
Age (yr) 62.0 (54.0∼70.0)
 At diagnosis 48.0 (39.0∼57.0)
 ≥65 209 (41.2)
Disease duration (yr) 14.0 (10.0∼17.0)
 ≥10 398 (78.5)
Male 81 (16.0)
Smoking history 51 (10.1)
ESR (mm/h) 35.0 (18.0∼60.0)
CRP (mg/L) RF (IU/mL) 1.8 (0.5∼6.6) 113.6 (48.0∼241.5)
Anti-CCP (U/mL) 100 (21.8∼500.0)

Values are presented as median (interquartile range) or number (%). Anti-CCP: anti-cyclic citrullinated peptide anti bodies, CRP: C-reactive protein, ESR: erythrocyte sedimentation rate, RF: rheumatoid factor.

Table 2.
Distribution of lung involvement in enrolled patients
Pulmonary involvement Data
No lung disease 249
Airway disease* 194
Bronchiectasis 145 (74.7)
Bronchiolitis 47 (24.2)
Emphysema 26 (13.4)
Small airway disease 10 (5.2)
Interstitial lung disease 64
UIP 20 (31.3)
NSIP 11 (17.2)
Unspecified 33 (51.5)
Pleural involvement 9
Pleural effusion 5 (55.6)
Pleural thickening 4 (44.4)
Vascular involvement 0

Values are presented as number only or number (%). NSIP: nonspecific interstitial pneumonia, UIP: usual interstitial pneumonia.

* Twenty-nine patients were accompanied by bronchiectasis and bronchiolitis. Four patients were accompanied by bronchiectasis and emphysema. One patient was accompanied by bronchiolitis and emphysema.

Table 3.
Comparison of clinical parameters between no lung disease, airway disease, and interstitial lung disease
Characteristic  No lung disease (n=249) Airway disease (n=194) Interstitial lung disease (n=64) p-value 
Age (yr) 58.0 (51.0∼65.0) 65.0 (58.0∼72.0) 68.0 (61.0∼75.0) <0.001*
 ≥65 70 (28.1) 98 (50.5) 41 (64.1) <0.001
 At diagnosis 44.0 (35.0∼52.0) 51.0 (44.0∼59.0) 58.0 (48.5∼64.0) <0.001*
Disease duration (yr) 14.0 (11.0∼17.0) 14.0 (10.0∼17.0) 11.0 (5.5∼16.5) <0.001*
 ≥10 211 (84.7) 152 (78.4) 35 (54.7) <0.001
Male 18 (7.2) 39 (20.1) 24 (37.5) <0.001
Smoking history 15 (6.0) 23 (11.9) 13 (20.3) 0.002
ESR (mm/h) 32.0 (16.0∼56.0) 33.5 (17.0∼59.0) 44.5 (30.0∼76.0) 0.003*
 Low tertile (≤23) 85 (34.1) 72 (37.1) 12 (18.8)  
 Middle tertile (24∼49) 92 (36.9) 61 (31.4) 24 (37.5) 0.048
 High tertile (≥50) 72 (28.9) 61 (31.4) 28 (43.8)  
CRP (mg/L) 1.3 (0.3∼4.0) 1.9 (0.5∼6.6) 6.1 (1.1∼26.1) <0.001*
 Low tertile (≤0.8) 100 (40.2) 67 (34.5) 12 (18.8)  
 Middle tertile (0.9∼4.0) 87 (34.9) 63 (32.5) 16 (25.0) <0.001
 High tertile (≥4.1) 62 (24.9) 64 (33.0) 36 (56.3)  
RF (IU/mL) 86.1 (33.7∼211.4) 125.8 (60.7∼272.4) 180.4 (76.4∼331.0) <0.001*
 High-titer (≥110) 105 (42.2) 111 (57.2) 42 (65.6) <0.001
Anti-CCP (U/mL) 76.4 (14.2∼500.0) 121.2 (35.2∼500.0) 267.5 (64.2∼500.0) <0.001*
 High-titer (≥100) 119 (47.8) 122 (62.9) 46 (71.9) <0.001
TNF-α inhibitors 23 (9.2) 16 (8.2) 3 (4.7) 0.500
Abatacept 2 (0.8) 2 (1) 0 (0) 0.721
Methotrexate 204 (81.9) 152 (78.4) 45 (70.3) 0.119
Bucillamine 13 (5.2) 8 (4.1) 5 (7.8) 0.508
Sulfasalazine 43 (17.3) 38 (19.6) 16 (25.0) 0.366
Leflunomide 24 (9.6) 25 (12.9) 3 (4.7) 0.156

Values are presented as median (interquartile range) or number (%). Anti-CCP: anti-cyclic citrullinated peptide antibodies, CRP: C-reactive protein, ESR: erythrocyte sedimentation rate, RF: rheumatoid factor, TNF-α, tumor necrosis factor alpha.

* Analysis was done Kruskal-Wallis test or

earson chi-square test.

Table 4.
Determination of factors associated with lung involvement in univariate analysis
Characteristic Airway disease vs. no lung disease Interstitial lung disease vs. no lung disease
cOR (95% CI) p-value* cOR (95% CI) p-value*
Age (yr) <65 1   1  
  ≥65 2.61 (1.76∼3.87) <0.001 4.56 (2.55∼8.15) <0.001
Disease duration (yr) <10 1   1  
  ≥10 0.65 (0.40∼1.06) 0.084 0.22 (0.12∼0.40) <0.001
Gender Female 1   1  
  Male 3.23 (1.78∼5.85) <0.001 7.70 (3.83∼15.46) <0.001
Smoking history No 1   1  
  Yes 2.10 (1.06∼4.14) 0.033 3.98 (1.78∼8.87) 0.001
ESR (mm/h) Low tertile (≤23) 1   1  
  Middle tertile (24∼49) 0.78 (0.50∼1.23) 0.287 1.85 (0.87∼3.92) 0.110
  High tertile (≥50) 1.00 (0.63∼1.59) 0.999 2.76 (1.31∼5.81) 0.008
CRP (mg/L) Low tertile (≤0.8) 1   1  
  Middle tertile (0.9∼4.0) 1.08 (0.69∼1.69) 0.734 1.53 (0.69∼3.42) 0.297
  High tertile (≥4.1) 1.54 (0.97∼2.46) 0.690 4.84 (2.34∼10.00) <0.001
RF (IU/mL) Low-titer (<110) 1   1  
  High-titer (≥110) 1.83 (1.26∼2.68) 0.002 2.62 (1.48∼4.65) 0.001
Anti-CCP (U/mL) Low-titer (<100) 1   1  
  High-titer (≥100) 1.85 (1.26∼2.72) 0.002 2.79 (1.53∼5.08) 0.001

Analysis was done by univariate multinomial logistic regression analysis. Anti-CCP: anti-cyclic citrullinated peptide antibodies, CI confidence interval, cOR: crude odds ratio, CRP: C-reactive protein, ESR: erythrocyte sedimentation rate, RF: rheumatoid factor

* p-values were obtained by comparison with patients with no lung disease.

Table 5.
Determination of factors associated with lung involvement in multivariate analysis
Characteristic Airway disease vs. no lung disease Interstitial lung disease vs. no lung disease
aOR (95% CI) p-value* aOR (95% CI) p-value*
Age (yr) <65 1   1  
  ≥65 2.58 (1.70∼3.90) <0.001 4.38 (2.30∼8.35) <0.001
Disease duration (yr) <10 1   1  
  ≥10 0.73 (0.42∼1.28) 0.274 0.30 (0.14∼0.62) 0.001
Gender Female 1   1  
  Male 2.57 (1.22∼5.42) 0.013 5.48 (2.20∼13.65) <0.001
Smoking history No 1   1  
  Yes 0.88 (0.36∼2.15) 0.782 0.76 (0.25∼2.30) 0.630
ESR (mm/h) Low tertile (≤23) 1   1  
  Middle tertile (24∼49) 0.72 (0.44∼1.17) 0.182 1.47 (0.63∼3.42) 0.374
  High tertile (≥50) 0.77 (0.44∼1.36) 0.373 1.52 (0.60∼3.83) 0.373
CRP (mg/L) Low tertile (≤0.8) 1   1  
  Middle tertile (0.9∼4.0) 0.94 (0.57∼1.55) 0.800 0.92 (0.38∼2.21) 0.854
  High tertile (≥4.1) 1.20 (0.66∼2.16) 0.553 1.60 (0.63∼4.09) 0.327
RF (IU/mL) Low-titer (<110) 1   1  
  High-titer (≥110) 1.45 (0.97∼2.17) 0.073 1.62 (0.85∼3.01) 0.142
Anti-CCP (U/mL) Low-titer (<100) 1   1  
  High-titer (≥100) 1.61 (1.07∼2.44) 0.023 1.68 (0.85∼3.31) 0.135

Analysis was done by multivariate multinomial logistic regression analysis. Anti-CCP: anti-cyclic citrullinated peptide antibodies, aOR: adjusted odds ratio, CI: confidence interval, CRP: C-reactive protein, ESR: erythrocyte sedimentation rate, RF: rheumatoid factor.

* p-values were obtained by comparison with patients with no lung disease.

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