Evaluation of Nailfold Capillaroscopy Online Training Using the Fast Track Algorithm.

Objective. Nailfold capillaroscopy (NFC) is increasingly used in the early identification of systemic scle-rosis (SSc)-related disorders. A consensus "Fast Track algorithm" was developed by the European Alliance of Associations for Rheumatology to aid differentiation of scleroderma from nonscleroderma pattern on NFC. Our objective was to evaluate the online training of NFC using the Fast Track algorithm in the assessment of scleroderma vs nonscleroderma NFC pattern. Methods. Participants attended the NFC online training workshop and were taught the Fast Track algo-rithm. Following the training, participants independently evaluated 45 NFC images in the same session, and then 2 to 4 weeks later, through the online platform. Participants had to differentiate between scleroderma vs nonscleroderma pattern, and additionally nonscleroderma pattern (normal) vs nonscleroderma pattern (nonspecific). The inter-and intrarater Cohen kappa agreement was calculated.Results. Ninety-eight participants took part in the baseline evaluation, and 61 in the reevaluation session. For identification of scleroderma vs nonscleroderma pattern, the mean (95% CI) inter-and intrarater kappa were 0.86 (0.83-0.88) and 0.83 (0.79-0.87), respectively. The overall inter-and intrarater kappa in the identification of scleroderma, nonscleroderma (normal), and nonscleroderma (nonspecific) patterns were 0.71 (0.69-0.74) and 0.71 (0.67-0.75), respectively. For nonscleroderma (normal) vs nonscleroderma (nonspecific) pattern, the inter-and intrarater kappa were 0.59 (0.55-0.63) and 0.59 (0.54-0.65), respectively.Conclusion. In this first study evaluating NFC online training using the Fast Track algorithm, we showed very good inter-and intrarater agreement for the identification of scleroderma and nonscleroderma NFC pattern, supporting the feasibility of online NFC standardized training workshops.