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07 March 2015 : Clinical Research  

A Retrospective Study of Clinical Characteristics of Interstitial Lung Disease Associated with Rheumatoid Arthritis in Chinese Patients

Jun-Xiang WangABE, Chuan-Guo DuBCDF

DOI: 10.12659/MSM.890880

Med Sci Monit 2015; 21:708-715

Abstract

BACKGROUND: Interstitial lung disease (ILD) in rheumatoid arthritis (RA) is associated with a poor prognosis. The purpose of this study was to assess the characteristics of ILD that are associated with RA.

MATERIAL AND METHODS: This was a retrospective study of 544 Chinese patients with RA (427 women and 117 men). RA-ILD was diagnosed by high-resolution computed tomography (HRCT). Patients with RA-ILD or with RA alone were compared in terms of age, sex distribution, duration of disease, clinical and laboratory parameters, history of smoking, and medication.

RESULTS: Based on HRCT imaging, 83 (15.26%) patients with RA were diagnosed with ILD. ILD was more frequent in older patients (59.60±9.66 vs. 50.54±13.76 years, P<0.001), in those with a longer duration of disease (7.46±7.40 vs. 5.27±6.32 years, P=0.013) and in male patients (34.9% vs. 19.1%, P=0.001). RA-ILD was found to be associated with hepatitis B surface antigen (HBsAg) positivity (odds ratio [OR]=2.56, 95% confidence interval [95% CI] 1.02–6.43) and smoking (OR=3.38, 95% CI 1.65–6.95). Higher levels of C-reactive protein (OR=3.59, 95% CI 1.58–8.15), anti-cyclic citrullinated peptide (CCP) (OR=2.24, 95% CI 2.09–4.13), and rheumatoid factor (OR=3.72, 95% CI 1.56–8.86) were detected in association with RA-ILD. RA-ILD was more frequently observed in patients treated with steroids (OR=1.91, 95% CI 1.18–3.09) or Tripterygium wilfordii (OR=2.56, 95% CI 1.21–5.40). Age (OR=2.20, 95% CI 1.04–4.65), age at RA onset (OR=2.55, 95% CI 1.11–5.90), anti-CCP (OR=2.47, 95% CI 1.19–5.17), and steroid use (OR=1.83, 95% CI 1.04–3.20) were independently associated with RA-ILD in multivariate analysis.

CONCLUSIONS: RA-ILD was associated with age, age at RA onset, anti-CCP, and steroid use. Anti-CCP antibodies might be important biomarkers of RA-ILD.

Keywords: Adolescent, Aged, 80 and over, Arthritis, Rheumatoid - pathology, Asian Continental Ancestry Group, Lung Diseases, Interstitial - pathology, Multivariate Analysis, Risk Factors, young adult

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750