Plasma-exchange and immunosuppression in the treatment of fulminating immune-complex crescentic nephritis.

Nine patients with fulminating immune-complex crescentic nephritis were treated by a regimen of intensive plasma-exchange, steroids, and cytotoxic drugs. In five patients with severe renal failure there was early and rapid improvement in renal function; in one patient an early but extensive focal necrotising glomerulitis was arrested; in two patients improvement was delayed for 3 and 7 weeks and could not confidently be attributed to therapy; one patient, anuric at presentation, did not recover renal function. Follow-up renal biopsy specimens, obtained in three patients, showed no evidence of active disease. With the Clq-deviation test, circulating immune complexes were detected in five patients before treatment and had disappeared when renal function had improved and stabilised: these patients showed the best response to therapy. In three patients temporary withdrawal of plasma-exchange was followed by the reappearance of immune complexes in the circulation and was accompanied in two patients by deterioration in renal function; reintroduction of plasma-exchange was followed by elimination of immune complexes and further improvement in renal function.