Control of post-transplant erythrocytosis by enalapril
1994
OBJECTIVE: To assess the erythropoietin response in patients with erythrocytosis after renal transplantation who were treated with enalapril. PATIENTS: Fourteen patients with stable renal transplants (creatinine clearance, 74.4 +/- 24.6 mL/min) and a packed cell volume of 51% or more over six months and who had no other cause for their erythrocytosis. METHODS: Patients were treated with enalapril for six months. Serum erythropoietin levels, creatinine clearance and packed cell volume were measured before and during the study; patients were reviewed each month. RESULTS: All patients had erythropoietin levels inappropriate for their packed cell volume. After six months' therapy with enalapril their mean erythropoietin concentration of 21.3 +/- 5.0 U/L fell to 7.4 +/- 1.3 U/L (P < 0.02) although the concentration increased in two patients. The mean packed cell volume fell from 52.7% +/- 0.5% to 44.4% +/- 1.0% (P < 0.0001). There was no change in renal function. CONCLUSION: Low-dose enalapril controls post-transplant erythrocytosis, at least in part, by lowering serum erythropoietin levels.
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