Is seronegative rheumatoid arthritis true rheumatoid arthritis? A nationwide cohort study

Rheumatology Oxford Journal

Fecha de publicación: 11 de noviembre de 2020

Autores: Kirsi Paalanen, Kari Puolakka, Elena Nikiphorou, Pekka Hannonen, Tuulikki Sokka

DOI: https://doi.org/10.1093/rheumatology/keaa623

Background: The classification of seronegative arthritides can be challenging. Our aim was to examine the incidence of SpA diagnosis among patients initially diagnosed as seronegative RA. Methods: Using nationwide Finnish registers from social insurance institutions, we identified all adult patients who were diagnosed with incident seronegative RA [International Classification of Diseases (ICD)-10 code M06] from 1 January 2000 to 31 December 2014. The patients whose diagnoses subsequently changed to the ICD-10 codes of SpA (M07, M45, M46, K50 and K51) were identified in the national care register, until 31 December 2016.

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