Increasing incidence and prevalence of ANCA-associated vasculitis in Northern Norway.

Objective: ANCA-associated vasculitides (AAV) have increased in prevalence since the 1980s. We aimed to investigate the incidence and prevalence of AAV during a 15-year period from 1999 to 2013 in Northern Norway, looking for variations during this period.

Methods: Patient records were retrieved from The Northern Norwegian Vasculitis Registry; in addition we searched all regional hospital databases.