The opposite occurs in oliguric ATN patients. Likewise, in early ATN from contrast, heme-pigment and in acute glomerulonephritis, the FENa may be low. Radiologic evidence of secondary hyperparathyoidism is also suggestive of long-standing renal failure. If a renal cause is suspected, determine if glomerular, interstitial, vascular or tubular. Pregnancy Certain disorders unique to pregnancy may occur.
Septic abortions are fortunately rare.
Thrombotic thrombocytopenic purpura usually occurs before 24 weeks and hemolytic uremic syndrome is usually found post-partum. Clinical features include coagulopathy with hypofibrinogenemia and hypoglycemia. Drug-induced ARF is usually reversible with withdrawal of therapy. In oliguric pts, K and Na restriction is needed, with fluid restriction if hyponatremic. Acidosis may require bicarbonate therapy.