Nephrol Dial Transplant (2004) 19: 141-149
© ERA–EDTA 2003; all rights reserved
Original Article
Association between serum ferritin and measures of inflammation, nutrition and iron in haemodialysis patients
1Division of Nephrology and Hypertension, Harbor-UCLA Medical Center and David Geffen School of Medicine, University of California Los Angeles, Torrance, CA and 2Division of Nephrology, San Francisco General Hospital, San Francisco, CA, USA
Correspondence and offprint requests to: Kamyar Kalantar-Zadeh, MD, MPH Division of Nephrology and Hypertension, Harbor-UCLA Medical Center, Harbor Mailbox 406, 1000 West Carson Street, Torrance, CA 90509-2910, USA. Email: kamkal{at}ucla.edu
Background. Serum ferritin is a frequently used marker of iron status in dialysis patients. Iron administration is to be withheld for ferritin values >800 ng/ml according to K/DOQI guidelines. We hypothesized that such non-iron-related factors as elements of the malnutrition–inflammation complex syndrome (MICS) may increase serum ferritin concentration independently of iron status.
Methods. We studied 82 prevalent maintenance haemodialysis (MHD) patients (including 43 men), aged 55.7 ± 15.3 years. The inflammatory and nutritional status was evaluated by serum C-reactive protein (CRP), Subjective Global Assessment (SGA) and its newer, fully quantitative versions, i.e. Dialysis Malnutrition Score (DMS) and Malnutrition–Inflammation Score (MIS).
Results. All but six patients had been on maintenance doses of intravenous iron dextran (between 100 and 200 mg/month) during the 10 weeks prior to the measurements. Serum ferritin levels were increased across SGA categories: (ANOVA P-value 0.03). Both unadjusted and multivariate adjusted correlation coefficients (r) for serum ferritin and CRP vs pertinent values were statistically significant for DMS and MIS and some other measures of nutritional status and iron indices. After deleting 10 MHD patients with either iron deficiency (ferritin <200 ng/ml) or iron overload (ferritin >2000 ng/ml), in the remaining 72 MHD patients both bivariate and multivariate correlations were much stronger and statistically significant (r = -0.33 and -0.29, respectively, P < 0.01). A multivariate model showed simultaneous, significant correlations between serum ferritin and both markers of inflammation and iron status independent of each other. After dividing the 72 MHD patients into two groups of serum ferritin based on a K/DOQI recommended serum ferritin cut-off of 800 ng/ml, the MIS and logarithm of serum CRP were significantly higher in the higher ferritin group.
Conclusions. Serum ferritin values in the range of 200–2000 ng/ml may be increased due to non-iron-related factors including elements of MICS.
Keywords: end-stage renal disease; ferritin; inflammation; iron; malnutrition–inflammation complex syndrome; protein–energy malnutrition
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