A randomized trial of intravenous and oral iron in chronic kidney disease

Although iron is commonly used to correct iron deficiency anemia (IDA) in chronic kidney disease (CKD), its effect on kidney function is unclear. To assess this, we randomly assigned patients with stage 3 and 4 CKD and IDA to either open-label oral ferrous sulfate (69 patients to 325mg three times daily for 8 weeks) or intravenous iron sucrose (67 patients to 200mg every 2 weeks, total 1g). The primary outcome was the between-group difference in slope of measured glomerular filtration rate (mGFR) change over two years. The trial was terminated early on the recommendation of an independent data and safety monitoring board based on little chance of finding differences in mGFR slopes, but a higher risk of serious adverse events in the intravenous iron treatment group. mGFR declined similarly over two years in both treatment groups (oral ?3.6ml/min per 1.73m2, intravenous ?4.0ml/min per 1.73m2, between-group difference ?0.35ml/min per 1.73m2; 95% confidence interval ?2.9 to 2.3). There were 36 serious cardiovascular events among 19 participants assigned to the oral iron treatment group and 55 events among 17 participants of the intravenous iron group (adjusted incidence rate ratio 2.51 (1.56–4.04)). Infections resulting in hospitalizations had a significant adjusted incidence rate ratio of 2.12 (1.24–3.64). Thus, among non-dialyzed patients with CKD and IDA, intravenous iron therapy is associated with an increased risk of serious adverse events, including those from cardiovascular causes and infectious diseases.


 Authors: Rajiv Agarwal, John W Kusekand Maria K Pappas

Reference: Kidney International advance online publication 17 June 2015; doi: 10.1038/ki.2015.163

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Last modified on Wednesday, 23 September 2015 07:54

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