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Lipids in plasma of enterally-fed very low-birthweight neonates
Insights
Continuous feeding of specialized infant formula led to higher plasma lipid levels in very low-birthweight neonates compared to bolus feedings. This highlights the importance of feeding methods for infant lipid metabolism.
Area of Science:
- Neonatal Nutrition
- Biochemistry
- Pediatric Gastroenterology
Background:
- Infant nutrition requires careful consideration of lipid metabolism, especially in premature infants.
- Medium-chain triglycerides (MCTs) are often used in formulas for very low-birthweight (VLBW) neonates.
- Feeding methods can influence nutrient absorption and metabolic responses in neonates.
Purpose of the Study:
- To compare plasma lipid patterns in VLBW neonates receiving continuous versus bolus feedings.
- To evaluate the impact of feeding method on lipid profiles when using a formula rich in MCTs.
- To establish baseline lipid data specific to feeding methods in VLBW infants.
Main Methods:
- Ten VLBW neonates were studied using alternate assignment to continuous drip or bolus feedings.
- Formula contained 50% of fat as MCTs.
- Plasma lipid levels (total lipids, free glycerol, triglycerides, free fatty acids, cholesterol) were measured over a 4-day study period.
Main Results:
- Continuous feeding resulted in stable plasma lipid levels, while bolus feeding showed transient peaks in free fatty acids post-feeding.
- Mean plasma total lipids and triglycerides were higher with continuous feeding compared to bolus feeding.
- Continuously fed neonates exhibited higher total lipid, triglyceride, free fatty acid, and cholesterol levels than pre-exposure controls; bolus-fed neonates only showed significantly higher triglycerides.
Conclusions:
- Feeding method significantly impacts plasma lipid patterns in VLBW neonates.
- Continuous feeding leads to elevated lipid concentrations, suggesting altered lipid handling.
- Further research is needed to tailor feeding strategies based on gestational maturity, postnatal age, and feeding method for optimal VLBW infant care.
Abstract:
Plasma lipid patterns (total lipids, free glycerol, triglycerides, free fatty acids, and cholesterol) were studied in 10 very low-birthweight neonates assigned alternately to continuous drip versus every 2-hr bolus feedings with a formula containing 50% of its fat as medium-chain triglycerides. In the group of neonates fed continuously, plasma lipids did not vary significantly during the 4-day study. In the bolus-fed group, free fatty acid concentrations peaked 30 min after feeding; the other fractions did not vary significantly during 2 hr after feeding. Mean plasma concentrations of total lipids and triglycerides were higher in the continuous than in the bolus-fed neonates; concentrations of the other fractions were similar. Compared to plasma concentrations measured in a group of 4-day-old very low-birthweight neonates before any exposure to exogenous fat, continuously fed neonates had higher total lipid, triglyceride, free fatty acid, and cholesterol concentrations; bolus-fed neonates only had significantly higher triglyceride levels. These data emphasize the need to obtain information on plasma lipid patterns that is specific for gestational maturity, postnatal age, and method and type of feeding.