Abstract
To investigate the frequency, severity and predictors of interstitial lung disease (ILD) in a cohort of South Africans with systemic sclerosis (SSc). Retrospective record review of SSc patients attending a tertiary Connective Tissue Diseases Clinic. Patients with ILD, defined by a combination of clinical findings, imaging, and lung function tests were compared to patients without ILD in terms of demographics, clinical features and autoantibodies. The majority (86.8%) of the 151 patients included were of Black ethnicity, 40% had ILD, of whom 39% had moderate–severe lung disease. Univariate predictors of ILD included: disease duration (OR 1.08, 95% CI 1.01–1.15); cough (OR 2.93, 95% CI 1.37–6.29); dyspnoea (OR 2.44, 95% CI 1.23–4.87); bibasal crackles (OR 7.58, 95% CI 3.31–17.37); diffuse cutaneous SSc (dcSSc) (OR 4.55, 95% CI 2.10–9.86) and a speckled anti-nuclear antibody (ANA) pattern (OR 2.47, 95% CI 1.25–4.90). Conversely, limited cutaneous disease (OR 0.22, 95% CI 0.09–0.50) and anti-centromere antibody (ACA) (OR 0.12, 95% CI 0.02–0.97) were protective. Independent predictors of ILD on multivariate analysis were bibasal crackles (OR 9.43, 95% CI 3.25–27.39), disease duration (OR 1.19, 95% CI 1.09–1.30) and speckled ANA (OR 2.95, 95% CI 1.22–7.15). Almost all (86.4%) patients received immunosuppressive treatment and the leading cause of death was related to ILD itself (44.4%). In this cohort of predominantly Black South Africans, SSc ILD was common and carried a poor prognosis. ILD occurred mainly, but not exclusively, in patients with dcSSc, especially those with a speckled ANA pattern. Conversely, the presence of ACA was protective against ILD.
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Mr Manoj Chiba assisted with statistical analysis.
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PA, MT, CI: Study conception and design. PA, MW: Acquisition of data. PA, MT, CI: Analysis and interpretation of data. PA, CI: Drafting of article. PA, MT, MW, CI: Critical revision of article. MT, CI: Supervision. PA, MT, MW, CI: Approval of version to be published.
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This was an unfunded study.
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Philippa Ashmore, Mohammed Tikly, Michelle Wong, Claudia Ickinger declare that they have no conflict of interest.
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The study was approved by the Human Research Ethics Committee (Medical), University of the Witwatersrand (approval no. M120966, 2012-09-28), with waive of informed consent as this was a retrospective chart review. All procedures performed in studies involving participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Ashmore, P., Tikly, M., Wong, M. et al. Interstitial lung disease in South Africans with systemic sclerosis. Rheumatol Int 38, 657–662 (2018). https://doi.org/10.1007/s00296-017-3893-0
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DOI: https://doi.org/10.1007/s00296-017-3893-0