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Fast track algorithm: How to differentiate a scleroderma pattern from a non-scleroderma pattern
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DOI：10.1016/j.autrev.2019.102394.png)
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Abstract
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Objectives: This study was designed to propose a simple Fast Track algorithm for capillaroscopists of any level of experience to differentiate scleroderma patterns from non-scleroderma patterns on capillaroscopy and to assess its inter-rater reliability. Methods: Based on existing definitions to categorise capillaroscopic images as scleroderma patterns and taking into account the real life variability of capillaroscopic images described standardly according to the European League Against Rheumatism (EULAR) Study Group on Microcirculation in Rheumatic Diseases, a fast track decision tree, the Fast Track algorithm was created by the principal expert (VS) to facilitate swift categorisation of an image as non-scleroderma pattern (category 1) or scleroderma pattern (category 2). Mean inter-rater reliability between all raters (experts/attendees) of the 8th EULAR course on capillaroscopy in Rheumatic Diseases (Genoa, 2018) and, as external validation, of the 8th European Scleroderma Trials and Research group (EUSTAR) course on systemic sclerosis (SSc) (Nijmegen, 2019) versus the principal expert, as well as reliability between the rater pairs themselves was assessed by mean Cohen's and Light's kappa coefficients. Results: Mean Cohen's kappa was 1/0.96 (95% CI 0.95-0.98) for the 6 experts/135 attendees of the 8th EULAR capillaroscopy course and 1/0.94 (95% CI 0.92-0.96) for the 3 experts/85 attendees of the 8th EUSTAR SSc course. Light's kappa was 1/0.92 at the 8th EULAR capillaroscopy course, and 1/0.87 at the 8th EUSTAR SSc course. C Conclusion: For the first time, a clinical expert based fast track decision algorithm has been developed to differentiate a non-scleroderma from a scleroderma pattern on capillaroscopic images, demonstrating excellent reliability when applied by capillaroscopists with varying levels of expertise versus the principal expert and corroborated with external validation.
Keywords:
EULAR Study Group on Microcirculation in
Rheumatic Diseases
Capillaroscopy
Reliability
Scleroderma patterns
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