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Assessment of calcinosis in Portuguese patients with systemic sclerosis — a multicenter study

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Abstract

Introduction/objectives

The study aims to define the clinical and subclinical calcinosis prevalence, the sensitivity of radiographed site and clinical method for its diagnosis, and the phenotype of Portuguese systemic sclerosis (SSc) patients with calcinosis.

Method

A cross-sectional multicenter study was conducted with SSc patients fulfilling Leroy/Medsger 2001 or ACR/EULAR 2013 classification criteria, registered in the Reuma.pt. Calcinosis was assessed through clinical examination and radiographs of hands, elbows, knees, and feet. Independent parametric or non-parametric tests, multivariate logistic regression, and sensitivity calculation of radiographed site and clinical method for calcinosis detection were performed.

Results

We included 226 patients. Clinical calcinosis was described in 63 (28.1%) and radiological calcinosis in 91 (40.3%) patients, of which 37 (40.7%) were subclinical. The most sensitive location to detect calcinosis was the hand (74.7%). Sensitivity of the clinical method was 58.2%. Calcinosis patients were more often female (p = 0.008) and older (p < 0.001) and had more frequently longer disease duration (p < 0.001), limited SSc (p = 0.017), telangiectasia (p = 0.039), digital ulcers (p = 0.001), esophageal (p < 0.001) and intestinal (p = 0.003) involvements, osteoporosis (p = 0.028), and late capillaroscopic pattern (p < 0.001). In multivariate analysis, digital ulcers (OR 2.63, 95% CI 1.02–6.78, p = 0.045) predicted overall calcinosis, esophageal involvement (OR 3.52, 95% CI 1.28–9.67, p = 0.015) and osteoporosis (OR 4.1, 95% CI 1.2–14.2, p = 0.027) predicted hand calcinosis, and late capillaroscopic pattern (OR 7.6, 95% CI 1.7–34.9, p = 0.009) predicted knee calcinosis. Anti-nuclear antibody positivity was associated with less knee calcinosis (OR 0.021, 95% CI 0.001–0477, p = 0.015).

Conclusions

Subclinical calcinosis high prevalence suggests that calcinosis is underdiagnosed and radiographic screening might be relevant. Multifactorial pathogenesis may explain calcinosis predictors’ variability.

Key Points

• Prevalence of subclinical calcinosis in SSc patients is substantial.

• Hand radiographs are more sensitive to detect calcinosis than other locations or clinical method.

• Digital ulcers were associated with overall calcinosis, esophageal involvement and osteoporosis were associated with hand calcinosis, and late sclerodermic pattern in nailfold capillaroscopy was associated with knee calcinosis.

• Anti-nuclear antibody positivity may be a protective factor for knee calcinosis.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Authors and Affiliations

Authors

Contributions

Miguel Guerra was the author of the idea for this project. Beatriz Samões, Miguel Guerra, Romana Vieira, and Joana Abelha-Aleixo contributed to the study conception and design. Data collection was performed by all authors. Data analysis and the first draft of the manuscript were written by Beatriz Samões, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Beatriz Samões.

Ethics declarations

Ethical approval

This study was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments and was approved by the Coordinating and Scientific Board of Reuma.pt and by the Ethics Committee of Centro Hospitalar de Vila Nova de Gaia e Espinho. Reuma.pt was approved by the National Data Protection Authority (CNPD).

Consent to participate and publication

All patients provided written informed consent for data collection, analysis, and publication. Analysis was performed on an anonymous dataset.

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None.

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Samões, B., Guimarães da Fonseca, D., Beirão, T. et al. Assessment of calcinosis in Portuguese patients with systemic sclerosis — a multicenter study. Clin Rheumatol 42, 2125–2134 (2023). https://doi.org/10.1007/s10067-023-06617-5

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  • DOI: https://doi.org/10.1007/s10067-023-06617-5

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