RESER/NVAN: Spanish Registry of patients with ANCA- associated vasculitis: objectives and methodology

To describe the objectives, design and methods of the Spanish Multicentre Registry of Patients with ANCA-associated Vasculitis (RESER/NVAN), as well as its strengths and limitations. RESER/NVAN is a project promoted by the Spanish Society of Rheumatology, in collaboration with the Spanish Society of Nephrology, whose main objective is to estimate the incidence of ANCA-associated vasculitis in Spain.

Retrospective longitudinal observational study of ANCA-associated vasculitis patients ≥18 years of age diagnosed between 1 January 2015 and 31 March 2021. All patients in the reference area of each centre were included, with the reference area being the area that includes the population attended by the centre. Thirty-two centres distributed throughout the Spanish geography participated, and the administrative and/or clinical databases of each centre and those of the services that could be involved in the diagnosis and/or treatment of these patients were reviewed. Sociodemographic and anthropometric variables, lifestyle habits, comorbidities and variables characterising vasculitis were collected.

RESER/NVAN represents one of the largest cohorts of patients with ANCA-associated vasculitis in Spain. Despite its retrospective nature, the study provides comprehensive and reliable information on ANCA-associated vasculitis and is an excellent source of data for future analyses to increase knowledge of this disease.