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Hyporesponsiveness to erythropoiesis-stimulating agents and renal survival in non-dialysis CKD patients

submitted by crazmeis 2 years and 1 month ago
Lower responsiveness to erythropoiesis-stimulating agents (ESA-R) predicts cardiovascular (CV) events. Whether ESA-R also affects the risk of end-stage renal disease (ESRD) is unknown. We evaluated ESA-R in 194 consecutive chronic kidney disease (CKD) patients, regularly seen in outpatient nephrology clinics, who started erythropoiesis-stimulating agent (ESA) therapy between 22–6. Exclusion criteria were causes of anaemia other than CKD or recent transfusion. ESA-R was calculated as (Hb1 – Hb)/time/ESA dose (g/dL/month/1 μg/week of ESA). Patients were classified, from lower to higher tertile of ESA-R, as poor, intermediate and good responders. Time to ESRD was the primary outcome. Age was 64 ± 16 years, 48% were male, 34% had diabetes and 32% had CV disease, glomerular filtration rate (GFR) 24 ± 13 mL/min/1.73 m2 and proteinuria .6 g/dL (interquartile range .2–1.9). First ESA dose was 23.7 ± 1.8 μg/week; haemoglobin (Hb) increased from 9.9 ± .8 g/dL to 1± 1.2 g/dL at first control, obtained after 1.4 ± .4 months. These changes corresponded to an ESA-R of .37 ± .38 g/dL/month/1 μg/week of ESA and tertiles limits were .17 and .47. Poor responders were younger and had lower GFR and higher proteinuria than intermediate and good responders. During the first 6 months of ESA therapy, poor responders showed lower Hb levels and sustained longer periods of Hb level <11 g/dL. During follow-up (median 3. years), 99 patients reached ESRD. At multivariable Cox's analysis, poor responsiveness was associated with higher risk of ESRD (hazard ratio 2.49, 95% confidence interval 1.28–4.84). ESA-R predicts renal prognosis in CKD patients followed in nephrology practice, where ESRD is the predominant outcome and ESA is commonly used at low dose.

Topic: Health

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