[Acute renal failure and vasculitis - when to consider it and what to do about it?]

Renal involvement in systemic autoimmune diseases such as ANCA-vasculitis is common. Acute kidney injury (AKI) limits the prognosis of the patient and needs to be detected early. However, AKI is in early phases clinically inapparent and at first contact with the patient, extra-renal symptoms may dominate the clinical presentation. Serum-Creatinine and urinary analysis provide useful information on the extent of renal involvement. A renal biopsy should confirm the diagnosis. Treatment needs to be adapted to the extent of ANCA-vasculitis and in cases with severe organ failure plasmapheresis should be performed. Maintenance immunosuppressive is necessary to prevent relapses and the patients should be monitored closely to detect renal flares early.