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Water--the major nutrient

B Friis-Hansen

    Acta Paediatrica Scandinavica. Supplement
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Managing water metabolism is critical for very low birth weight infants due to immature kidney and neuroendocrine functions. Careful monitoring of weight and urine output is essential to prevent dehydration or overhydration complications.

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    Area of Science:

    • Neonatalogy
    • Pediatric Nephrology
    • Infant Physiology

    Background:

    • Infants of very low birth weight (VLBW) face significant water metabolism challenges.
    • They have a proportionally larger surface area, lower intracellular water, and higher extracellular/total body water volumes.
    • Immature kidney and neuroendocrine functions, coupled with high insensible water loss, exacerbate these issues.

    Purpose of the Study:

    • To highlight the complexities of water metabolism in VLBW infants.
    • To discuss the risks of both dehydration and overhydration.
    • To provide guidance on monitoring and managing fluid balance in this population.

    Main Methods:

    • Clinical examination and frequent body weight monitoring (twice daily).
    • Measurement of urine volume and osmolarity.

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  • Consideration of factors influencing evaporative water loss (thermal environment, humidity).

    • Main Results:

    • Water imbalance can lead to dehydration (poor circulation, acidosis, increased hematocrit, hyperbilirubinemia) or overhydration (edema, heart failure, increased risk of PDA, BPD, NEC).
    • Evaporative water losses are variable, making fixed daily intake limits impractical.
    • A 5-10% neonatal weight loss may be beneficial by reducing extracellular water and cardiac workload.

    Conclusions:

    • Close clinical monitoring, including weight and urine parameters, is crucial for guiding fluid management.
    • Inappropriate secretion of antidiuretic hormone (ADH) can affect urine osmolarity interpretation.
    • Supplementation of sodium (approx. 2 mmol Na/kg/day) is often necessary from the fourth day of life to counteract renal sodium wasting, especially with human milk or low-salt formulas.