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Changes in erythrocyte and plasma carnitine concentrations in preterm neonates
The American Journal of Clinical Nutrition
|January 1, 1986
Summary
Carnitine levels in preterm infants show distinct plasma and erythrocyte pools. Erythrocyte carnitine decreases post-birth, while plasma levels correlate with intake, suggesting separate regulatory factors.
Area of Science:
- Biochemistry
- Neonatology
- Nutritional Science
Background:
- Carnitine is essential for fatty acid metabolism.
- Preterm infants have altered metabolic needs and immature systems.
- Understanding carnitine dynamics in neonates is crucial for nutritional support.
Purpose of the Study:
- To investigate erythrocyte and plasma carnitine concentrations in low birthweight, preterm infants.
- To determine the relationship between carnitine intake and its levels in different blood compartments.
- To explore the developmental changes in carnitine pools during the first three weeks of life.
Main Methods:
- Measured total, free, and acyl carnitine in erythrocytes and plasma.
- Analyzed samples from 13 preterm infants from birth to 21 days of age.
- Utilized linear regression to assess correlations between carnitine concentrations, intake, and age.
Main Results:
- Erythrocyte carnitine contribution to total blood carnitine decreased significantly from birth to 14 days.
- No significant correlation was found between plasma and erythrocyte carnitine concentrations.
- Plasma carnitine levels positively correlated with daily intake, unlike erythrocyte levels.
- Erythrocyte acyl carnitine concentrations were lower than adult values at 3 weeks.
Conclusions:
- Plasma and erythrocyte carnitine represent distinct pools in preterm infants.
- Plasma carnitine levels are influenced by nutritional intake.
- Erythrocyte carnitine dynamics are regulated by factors independent of dietary intake in this population.