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BACKGROUND Therapeutic plasma exchange (TPE) has been recommended by guidelines for the treatment of anti-neutrophil cytoplasmic antibodies-associated vasculitis (AAV) with severe kidney dysfunction. In recent years, some researchers have proposed that double-filtration plasmapheresis (DFPP) can also be used effectively in the treatment of these patients, but the difference between the 2 modalities of plasmapheresis is not clear. METHODS In this retrospective cohort study of AAV patients with serum creatinine ≥500 μmol/L from March 2013 t