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Acute renal failure in IgA nephropathy.

Twenty-five (3%) of 865 patients with IgA nephropathy presented with acute renal failure (ARF). These patients were matched with 25 patients in the same series who presented with irreversible renal impairment. Patients with acute renal failure had a significantly higher incidence of macroscopic hematuria and red blood cells in tubules. Conversely, a greater percentage of patients with irreversible renal failure had > or = 40% sclerosed glomeruli. The long-term prognosis for patients presenting with ARF appears excellent with only 1 (4%) patient developing chronic renal failure after a mean follow-up of 65 months. Mechanisms of acute renal failure in IgA nephropathy are discussed.