Stool water loss in very-low-birth-weight neonates
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1Department of Pediatrics, University of South Carolina, Charleston.
Insights
Estimating daily stool water loss in very-low-birth-weight (VLBW) infants is crucial for fluid management. This study found that 7 ml/kg/day is a reliable estimate for VLBW babies on enteral feeds.
Area of Science:
- Neonatalogy
- Pediatric Gastroenterology
- Clinical Nutrition
Background:
- Accurate fluid management is critical for very-low-birth-weight (VLBW) infants.
- Current estimates for stool water loss in VLBW infants are based on data from term neonates, potentially leading to inaccuracies.
- Understanding precise fluid requirements, including stool losses, is essential for optimal infant growth and development.
Purpose of the Study:
- To determine the actual 24-hour stool water content in healthy VLBW male infants receiving full enteral feeds.
- To compare these findings with existing working norms for stool water loss.
- To establish a more accurate estimate for daily stool water loss in VLBW infants.
Main Methods:
- Collected 24-hour stool samples from 11 healthy VLBW male infants (birth weight 1,311 +/- 112 g, gestational age 30.8 +/- 1.5 weeks).
- Infants were less than 2 weeks old and received enteral formula feedings (>= 100 ml/kg/day) without parenteral fluid supplementation.
- Determined the water content of stool collections and analyzed correlations with gestational age, feeding volume, and birth weight.
Main Results:
- The mean stool water loss was 7.2 +/- 4.0 ml/kg/day.
- A significant correlation was observed between gestational age at birth and the number of stools per day (r = 0.696, p < 0.02).
- No significant correlation was found between daily stool water loss and gestational age, feeding volume, or birth weight.
Conclusions:
- The study suggests that 7 ml/kg/day is a reasonable and practical estimate for daily stool water loss in VLBW infants on enteral nutrition.
- This finding can aid clinicians in refining fluid management strategies for this vulnerable population.
- Further research could explore variations in stool water content across different feeding types and infant populations.
Abstract:
Fluid requirements in very-low-birth-weight (VLBW) infants include compensation for renal, insensible (skin and lung), and stool losses and provision for fluid retained for growth. Current estimates of stool water losses in VLBW infants are based on measurements established in term neonates. Therefore, the water content of 24-hour stool collections were determined in 11 healthy VLBW male infants on full enteral feeds and compared to the working norms. The neonates in this study were less than 2 weeks old with a mean +/- SD birth weight and gestational age of 1,311 +/- 112 g and 30.8 +/- 1.5 weeks, respectively. They were receiving only enteral formula feedings of 100 ml/kg/day or more with no parenteral fluid supplementation. The mean +/- SD number of stools and water content of the stools was 2.7 +/- 2.0/day and 7.2 +/- 4.0 ml/kg/day, respectively. There was a significant correlation (r = 0.696, p less than 0.02) between gestational age at birth and number of stools per day, but the correlation between stool water loss per day, gestational age, volume of feedings per day, and birthweight was not significant. Based on this study, 7 ml/kg/day is a reasonable estimate of daily stool water loss in VLBW babies.