Evaluation of the Prevalence, and Immunological Characteristics of Small Fiber Neuropathy in Patients With Primary Sjögren's Syndrome (NEUROSS)

The investigators propose to conduct a prospective study evaluating the prevalence of SNN in pSS patients and to find clinical characteristics and specific immunological profiles in pSS patients with SFN. Peripheral nervous system involvement account for 15% of pSS cases. Among peripheral nervous system complication, SFN appears to be prevalent. However the association between pSS and SFN has been scarcely evaluated. There are not many relevant studies using similar methodology to evaluate pSS patients for small fiber dysfunction. Furthermore, autoimmune mechanisms are thought to play a key role in SFN pathogenesis in pSS and the association between SFN and specific immunological profiles has been poorly studied. So the aim of this study is to evaluate the prevalence of SFN in pSS patients by using the Sudoscan which is a fast and non- invasive tool. The Sudoscan could offer an accessible alternative for early SFN detection, improving patient management. The secondary purpose is to analyze systemic and immunological profiles, as well as disease's activity and quality of life of patients with pSS-related SFN.