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Nutrient balance in the preterm infant. 3. Effect of balance duration on outcome measurements
Insights
For formula-fed preterm infants, a 48-hour nutrient balance collection accurately reflects outcomes compared to longer 84-hour periods. This finding simplifies mineral and nitrogen balance studies in neonates.
Area of Science:
- Neonatal nutrition
- Pediatric gastroenterology
- Infant metabolism
Background:
- Accurate assessment of nutrient absorption and retention is crucial for optimizing growth and development in preterm infants.
- Traditional balance studies often require lengthy collection periods, posing practical challenges in neonatal intensive care units.
Purpose of the Study:
- To evaluate the impact of varying balance collection durations (48-hour vs. 84-hour) on nutrient outcome measurements in formula-fed preterm infants.
- To determine if shorter balance periods can provide reliable data comparable to longer standard durations.
Main Methods:
- Conducted 18 84-hour nutrient balance studies in preterm infants (birth weight 1,362 ± 125 g, gestational age 32.3 ± 1.7 weeks).
- Analyzed data from contiguous 48-hour and 36-hour periods within the 84-hour collections.
- Utilized paired t-tests, variance tests, and linear regression analysis for statistical comparisons.
Main Results:
- Nitrogen absorption and retention during 48-hour collections were not significantly different from 36-hour collections.
- 48-hour nitrogen absorption and retention showed significant linear correlation with 84-hour data (p < 0.0001).
- Similar findings were observed for calcium, phosphorus, magnesium, zinc, and copper balance measurements.
Conclusions:
- A 48-hour nutrient balance collection period is sufficient and accurate for assessing nutrient absorption and retention in enterally fed preterm infants.
- Shortening balance study durations to 48 hours can be implemented without compromising data accuracy, offering a more practical approach.
Abstract:
To determine the effect of balance duration on outcome measurements 18 84-h balances were performed in a group of formula-fed preterm infants (birth weight = 1,362 +/- 125 g; gestational age = 32.3 +/- 1.7 weeks). Each 84-h balance was broken into contiguous 48- and 36-h periods. Comparisons (paired t tests, paired variance tests, and linear regression analysis) were made between the 48-h and 36-h (paired t and F tests) and between the 48-h and 84-h collections (simple linear regression). Nitrogen absorption (mean +/- SD) during 48-h collection (365 +/- 58 mg/kg/day and 87 +/- 3%) was not significantly different from that of the 36-h collection (381 +/- 66 mg/kg/day and 84 +/- 4%). Nitrogen retention during the 48-h collection (301 +/- 59 mg/kg/day, 72 +/- 6%) also was not significantly different from that of the 36-h collection (318 +/- 64 mg/kg/day, 72 +/- 6%). Moreover, nitrogen absorption and retention during the 48-h collection were significantly related (p less than 0.0001 for linear regression comparisons) to that of the 84-h collection. Similar observations were noted for calcium, phosphorus, magnesium, zinc, and copper absorption and retention. We conclude that a 48-h collection may be used in place of an 84-h collection without compromising the accuracy of the balance data in the enterally fed preterm infant.