[ANCA-associated vasculitis]

The vasculitides represent one group of the systemic rheumatic diseases. Among the vasculitides we distinguish between large- (i.e. giant cell arteritis), medium- (i.e. polyarteritis nodosa) and small-vessel vasculitides (i.e. ANCA-associated vasculitides). Granulomatosis with polyangiitis, microscopic polyangiitis and eosinophilic granulomatosis with polyangiitis belong to the ANCA-associated vasculitides. They share the features of vasculitic manifestations in small- to medium-sized vessel beds (which can occur in almost any organ system) and the presence of ANCA, the detection of which, however, is not necessarily mandatory. The treatment of AAV depends on disease stage and activity and is carried out on the basis of randomized controlled trials with an initial regimen aimed at inducing remission followed by maintenance treatment. In addition to glucocorticoids, conventional immunosuppressants (such as methotrexate, azathioprine and cyclophosphamide) form the basis of treatment, whereby rituximab, first licensed for the treatment of severe active GPA and MPA in 2013, has emerged as new treatment option.