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Published ahead of print on January 30, 2008
Clinical Journal of the American Society of Nephrology
© 2008 American Society of Nephrology
doi: 10.2215/CJN.03020707
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Received July 23, 2007
Accepted on December 12, 2007

ORIGINAL ARTICLES

Hemoglobin Decline in Children with Chronic Kidney Disease: Baseline Results from the Chronic Kidney Disease in Children Prospective Cohort Study

Jeffrey J. Fadrowski *1, Christopher B. Pierce {dagger}, Stephen R. Cole {dagger}, Marva Moxey-Mims {ddagger}, Bradley A. Warady {sect}, and Susan L. Furth *{dagger}||

Departments of *Pediatrics and {dagger}Epidemiology and ||Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins University, Baltimore, and {ddagger}National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland; and {sect}Department of Pediatrics, University of Missouri, Kansas City, Missouri


1 To whom correspondence should be addressed. E-mail: jfadrow1{at}jhmi.edu.


  Abstract

Background and objectives: The level of glomerular filtration rate at which hemoglobin declines in chronic kidney disease is poorly described in the pediatric population.

Design, setting, participants, & measurements: This cross-sectional study of North American children with chronic kidney disease examined the association of glomerular filtration rate, determined by the plasma disappearance of iohexol, and hemoglobin concentration.

Results: Of the 340 patients studied, the mean age was 11 ± 4 yr, the mean glomerular filtration rate was 42 ± 14 ml/min per 1.73 m2, and the mean hemoglobin was 12.5 ± 1.5. Below a glomerular filtration rate of 43, the hemoglobin declined by 0.3 g/dl (95% confidence interval -0.2 to -0.5) for every 5-ml/min per 1.73 m2 decrease in glomerular filtration rate. Above a glomerular filtration rate of 43 ml/min per 1.73 m2, the hemoglobin showed a nonsignificant decline of 0.1 g/dl for every 5-ml/min per 1.73 m2 decrease in glomerular filtration rate.

Conclusions: In pediatric patients with chronic kidney disease, hemoglobin declines as an iohexol-determined glomerular filtration rate decreases below 43 ml/min per 1.73 m2. Because serum creatinine–based estimated glomerular filtration rates may overestimate measured glomerular filtration rate in this population, clinicians need to be mindful of the potential for hemoglobin decline and anemia even at early stages of chronic kidney disease, as determined by current Schwartz formula estimates. Future longitudinal analyses will further characterize the relationship between glomerular filtration rate and hemoglobin, including elucidation of reasons for the heterogeneity of this association among individuals.




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