Abstract
Background
Pretreating renal formulas with medications to lower the potassium and phosphorus content is common in clinical practice; however, the effect of this treatment on other nutrients is relatively unstudied. We examine whether nutrient composition is affected by pretreating renal formulas with sodium polystyrene sulfonate (SPS) suspension and sevelamer carbonate.
Methods
Fixed medication doses and treatment times were utilized to determine changes in the nutrient composition of Suplena® and Similac® PM 60/40. The effect of simultaneously adding both medications (co-administration) to the formula on the nutrient composition of Suplena® was also evaluated.
Results
Pretreatment of Suplena® with SPS reduced the concentrations of calcium (11–38 %), copper (3–11 %), manganese (3–16 %), phosphorus (0–7 %), potassium (6–34 %), and zinc (5–20 %) and increased those of iron (9–34 %), sodium (89–260 %), and sulfur (19–45 %) and the pH (0.20–0.50 units). Pretreatment of Similac® PM 60/40 with SPS reduced the concentrations of calcium (8–29 %), copper (5–19 %), magnesium (3–26 %), and potassium (33–63 %) and increased those of iron (13–87 %) and sodium (86–247 %) and the pH (0.40–0.81 units). Pretreatment of both formulas with the SPS suspension led to significant increases in the aluminum concentration in both formulas (507–3957 %). No differences in potassium concentration were observed between treatment times. Unexpectedly, the levels of neither phosphorus nor potassium were effectively reduced in Suplena® pretreated with sevelamer carbonate alone or when co-administered with SPS.
Conclusions
Pretreating formula with medications alters nutrients other than the intended target(s). Future studies should be aimed at predicting the loss of these nutrients or identifying alternative methods for managing serum potassium and phosphorus levels in formula-fed infants. The safety of pretreating formula with SPS suspension should also be examined.
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Acknowledgments
We thank our pharmacists, Chelsey Jensen and Valerie Smith, who provided assistance with the technical, dosage, and administration aspects of the pharmaceutical agents used in this study; Douglas Bittel and Patricia Cudmore for their assistance and training in the lab; Robin Carroll and the Patient Care Services Research staff for assisting in the approval and logistics of this study; Children’s Mercy Hospital and the University of Kansas Medical Center for their support and use of resources and space that was needed to complete this study.
Funding
This work was supported by the Children’s Mercy Hospital Patient Care Services Research Fund and Department of Nutrition Services funding, KL2 TR000119-04.
Conflict of interest
The authors declare that they have no conflict of interest.
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Taylor, J.M., Oladitan, L., Carlson, S. et al. Renal formulas pretreated with medications alters the nutrient profile. Pediatr Nephrol 30, 1815–1823 (2015). https://doi.org/10.1007/s00467-015-3115-5
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DOI: https://doi.org/10.1007/s00467-015-3115-5