Iron dosing regimens affect dialysis patients' infection risk

June 20, 2013

Washington, DC (June 20, 2013) -- While intravenous iron is critical for maintaining the health of many dialysis patients, administering large doses over a short period of time increases patients' risk of developing serious infections, according to a study appearing in an upcoming issue of the Journal of the American Society of Nephrology (JASN). Smaller doses given for a longer period of time appears to be much safer.

Dialysis patients often develop anemia, or low levels of red blood cells, and must receive intravenous treatments of iron to correct the condition. Unfortunately, intravenous iron may promote bacterial growth and impair the immune system, and treated patients face an increased risk of infection. No large studies have looked at how different iron dosing regimens might influence this risk.

To investigate, Maurice Alan Brookhart, PhD (University of North Carolina, Chapel Hill) and his colleagues assessed the safety of commonly used intravenous iron dosing practices in dialysis patients with respect to infection risk. In particular, they compared the safety of providing a large amount of iron over a short period of time (called bolus or repletion dosing) vs providing smaller, less frequent administrations (called maintenance dosing). The researchers analyzed clinical information from 117,050 patients followed for three months. Of these, 12% received bolus dosing, 49% received maintenance dosing, and 38% received no iron.

Among the major findings:"Although administration of iron is a necessary to manage anemia in hemodialysis patients, our results suggest that providing a large amount of iron over a short time may increase the risk of serious infections in dialysis patients. Smaller, less frequent doses of iron appear to be safer," said Dr. Brookhart.

In an accompanying editorial, Connie Rhee, MD, and Kamyar Kalantar-Zadeh, MD, PhD (University of California Irvine School of Medicine) noted that because the study is an observational one, more research is needed. "To date no randomized controlled studies have been conducted to substantiate the risk of increased infection or death as a result of IV iron therapy in dialysis patients," they wrote.
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Study co-authors include Janet Freburger, PhD, Alan R. Ellis, PhD, MSW, Lily Wang, Ph, Abhijit Kshirsagar, MD, (University of North Carolina, Chapel Hill); and Wolfgang Winkelmayer, MD, ScD (Stanford University School of Medicine).

Disclosures: Dr. Brookhart has received investigator-initiated grant support from Amgen has served as a scientific advisor for Pfizer, Amgen, and Rockwell Medical but has not accepted personal compensation for this service (honoraria declined, received by institution, or donated). Dr. Winkelmayer has participated on scientific advisory boards for Amgen, Affymax, Bayer, Fibrogen, GlaxoSmthKline, Sandoz, and Vifor Fresenius Medical Care Renal Pharma Ltd.

The article, entitled "Intravenous Iron Supplementation Practices and Infection Risk in Hemodialysis Patients," will appear online at http://jasn.asnjournals.org/ on June 20, 2013, doi: 10.1681/ASN.2012121164.

The editorial, entitled "Is Iron Maintenance Therapy Better Than Load and Hold?" will appear online at http://jasn.asnjournals.org/ on June 20, 2013, doi: 10.1681/ASN.2013050456.

The content of this article does not reflect the views or opinions of The American Society of Nephrology (ASN). Responsibility for the information and views expressed therein lies entirely with the author(s). ASN does not offer medical advice. All content in ASN publications is for informational purposes only, and is not intended to cover all possible uses, directions, precautions, drug interactions, or adverse effects. This content should not be used during a medical emergency or for the diagnosis or treatment of any medical condition. Please consult your doctor or other qualified health care provider if you have any questions about a medical condition, or before taking any drug, changing your diet or commencing or discontinuing any course of treatment. Do not ignore or delay obtaining professional medical advice because of information accessed through ASN. Call 911 or your doctor for all medical emergencies.

Founded in 1966, and with more than 13,500 members, the American Society of Nephrology (ASN) leads the fight against kidney disease by educating health professionals, sharing new knowledge, advancing research, and advocating the highest quality care for patients.HighlightsAs of 2010, there were approximately 410,000 dialysis patients in the United States.

American Society of Nephrology

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