Hyperkalemia has been noted to occur spontaneously in patients with long-standing systemic lupus erythematosus who did not have advanced renal insufficiency. The patients previously described all had relatively normal renin-aldosterone systems, and the hyperkalemia was thus presumed to be secondary to a primary defect in renal tubular potassium secretion. We describe at 10-year-old girl with lupus nephritis, without significant renal insufficiency, who had hyperkalemia from hyporeninemic hypoaldosteronism postulated to be due to vasculitis involving the afferent/efferent arterioles and juxtaglomerular apparatus.
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