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Calcium, phosphorus and magnesium needs for the low-birth-weight infant
1USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX 77030, USA.
Insights
Parenteral nutrition for low birth weight (LBW) infants requires specific mineral and amino acid concentrations, varying by duration and feeding method. These guidelines aim to optimize growth and nutrient utilization in vulnerable newborns.
Area of Science:
- Neonatal Nutrition
- Pediatric Gastroenterology
- Intensive Care Medicine
Background:
- Low birth weight (LBW) infants often require parenteral nutrition (PN) due to immature gastrointestinal systems.
- Optimizing mineral and amino acid intake is crucial for growth and development in LBW infants receiving PN.
Purpose of the Study:
- To provide evidence-based recommendations for mineral and amino acid content in PN solutions for LBW infants.
- To differentiate recommendations based on the duration of PN therapy and feeding method (parenteral vs. enteral fortification).
Main Methods:
- Review and synthesis of existing literature and clinical guidelines on PN for LBW infants.
- Analysis of recommended mineral (Calcium, Phosphorus, Magnesium) and amino acid concentrations.
Main Results:
- Short-term PN (<2 weeks): Ca 15 mM, P 15 mM, Mg 2.5 mM.
- Long-term PN (≥2 weeks): Ca 20 mM, P 20 mM, Mg 2.5 mM, with ≥2.2 g% amino acids and cysteine-HCl.
- Enteral feeding (human milk): Ca 2-3 mmol/kg/day, P 1.5-2.0 mmol/kg/day fortifiers.
- Commercial formula feeding: Ca >3.5 mmol/kg/day, P 2.5 mmol/kg/day, Mg 0.2 mmol/kg/day.
Conclusions:
- Specific mineral and amino acid formulations are essential for LBW infants on PN or fortified enteral feeds.
- Recommendations should be adjusted based on the duration of therapy and feeding source.
- Ongoing research into bioavailable mineral sources may necessitate future guideline revisions.
Abstract:
Parental mineral-containing solutions for LBW infants should be started soon after birth. For the initiation of parenteral nutrition and during short-term therapy for less than 2 weeks' duration, LBW infants should receive parenteral nutrition solutions at rates of approximately 120-130 ml/kg/day, containing minerals at the following concentrations: Ca 15 mM, P 15 mM and Mg 2.5 mM. For optimal growth and nutrient utilization, however, LBW infants maintained on parenteral nutrition at rates of 120-130 ml/kg/day for 2 or more weeks should receive mineral concentrations of Ca 20 mM, P 20 mM and Mg 2.5 mM. In addition, these latter mixtures must contain amino acids in concentrations greater than or equal to 2.2 g% and cysteine-HCl must be provided. As newer formulations emerge, these recommendations may be modified. For human milk-fed LBW infants, after 1 week of enteral feeding, Ca and P should be supplied as fortifiers. Ca 2-3 mmol/kg/day and P 1.5-2.0 mmol/kg/day should be provided in addition to human milk. Magnesium supplementation of human milk is unnecessary. These recommendations assume that the intake of human milk is approximately 200 ml/kg/day and will decrease as more bioavailable mineral salts are found. For LBW infants fed commercial formula, the intake of Ca should be greater than 3.5 mmol/kg/day, P 2.5 mmol/kg/day and Mg 0.2 mmol/kg/day. These recommendations assume reported bioavailabilities of mineral salts. If more bioavailable sources are found, these recommendations will decrease.(ABSTRACT TRUNCATED AT 250 WORDS)