ISSN:
1432-1440
Keywords:
Erythropoietin
;
Acute renal failure
;
Thrombotic thrombocytopenic purpura
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary In this study, erythropoietin serum levels were serially determined in eight patients with acute renal failure to get a lead on the etiology of anemia in acute renal failure and to address the relationship between erythropoietin synthesis and renal excretory performance. Erythropoietin serum levels rapidly decreased after onset of acute renal failure to values of 12.8 ± 10.3 mU/ml compared to 16.8 ± 9.4 mU/ml in healthy controls. After restoration of renal function, erythropoietin levels climbed slowly in six patients (15.2 ±5.3 mU/ml), and in relation to prolonged anemia in these patients, a relative deficiency of erythropoietin could be observed. In one patient with thrombotic thrombocytopenic purpura causing acute renal failure, the decline of erythropoietin secretion was not observed, and in a phase of the disease when plasma exchange therapy was interrupted, markedly increased erythropoietin levels, up to 182 mU/ml, were detected despite the renal failure. Focusing on erythropoietin secretion in thrombotic thrombocytopenic purpura, we followed hormone synthesis in two other patients with the same disease, one of whom had mild renal insufficiency and one had normal renal function. High erythropoietin levels of up to 205 mU/ml were found in these patients, similar to the peak levels found in the patient with complete renal failure. Plasmapheresis treatment reduced erythropoietin production in all three patients with thrombotic thrombocytopenic purpura. In summary, our study indicates that in most cases of acute renal failure, erythropoietin synthesis is compromised and may contribute to the development of anemia in renal failure and aggravate the persistence of anemia after restoration of renal function. Comparing erythropoietin production in patients with acute renal failure and in those with thrombotic thrombocytopenic purpura with varying renal involvement we conclude that erythropoietin secretion is not closely linked to renal excetory performance, and that hemolysis or other stimuli in thrombotic thrombocytopenic purpura can override the decline of erythropoietin production implied by renal failure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00227356
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