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Triglyceride profiles in preterm infants reveal dynamic and age-specific trajectories
Emma R Gertel1, Victoria Y Ding2, Thanaphong Phongpreecha3
1Sackler School of Medicine, American Medical Program, Tel Aviv University, Tel Aviv, Israel.
Insights
Triglyceride levels in preterm infants vary with gestational age, birth weight, and postnatal age, suggesting developmental regulation. Current monitoring may not predict later neonatal morbidities.
Area of Science:
- Neonatalogy
- Biochemistry
- Pediatric Critical Care
Background:
- Triglyceride (TG) monitoring in preterm infants on lipid emulsion therapy lacks defined clinical utility.
- Understanding TG variations is crucial for optimizing nutritional support in vulnerable neonates.
Purpose of the Study:
- To define triglyceride (TG) values in preterm infants (<32 weeks' gestational age).
- To investigate associations between TG levels, gestational age (GA), birth weight (BW), lipid dosing, and postnatal age.
- To explore the relationship between TG levels and major neonatal outcomes.
Main Methods:
- Retrospective, multi-centered observational study.
- Analysis of TG values in preterm infants (<32 weeks' GA) across two academic medical centers.
- Multivariable logistic regression and spline regression to assess associations.
Main Results:
- TG distributions significantly differed by GA, with highest values in infants born at 22-25 weeks' gestation and/or extremely low birth weight.
- TG levels peaked around two weeks postnatal age in the 22-25 week cohort.
- Lipid emulsion dosing <2 g/kg/day was associated with reduced hypertriglyceridemia risk; continuous TG values showed limited association with major neonatal outcomes (RDS, BPD, NEC, ROP).
Conclusions:
- Circulating TG levels in preterm infants are developmentally regulated, varying with GA, BW, and postnatal age.
- Age- or weight-based TG reference ranges should be considered, especially for extremely preterm infants (22-25 weeks' GA).
- The relevance of early TG measurements for predicting later neonatal morbidities requires further investigation.
Introduction:
Triglyceride (TG) values are routinely monitored in preterm infants receiving lipid emulsion therapy, but their clinical utility remains poorly defined. The objective of this study was to define TG values and their associations with gestational age (GA), birth weight (BW), lipid dosing and postnatal age in preterm infants born <32 weeks' across two distinct academic medical centers.
Methods:
We conducted a retrospective multi-centered observational study using data from the Lucile Packard Children's Hospital (LPCH) Stanford Neonatal Intensive Care Unit and the Beth Israel Deaconess Medical Center (BIDMC) Neonatal Intensive Care Unit. TG values in infants <32 weeks' GA were interrogated by GA, postnatal age, BW and in aggregate. Pre- and postnatal factors were evaluated using multivariable logistic regression in the LPCH Stanford data set for associations with hypertriglyceridemia, defined using thresholds of 200 mg/dL and 250 mg/dL. Spline regression was used to model the relationship between continuous TG values and postnatal outcomes in both data sets.
Results:
TG distributions differed significantly by GA, with the highest values observed among infants born at 22-25 weeks' gestation and/or with extremely low birth weight. In the LPCH 22-25 week cohort, TG levels peaked at approximately two weeks of postnatal age and subsequently declined. Lipid emulsion dosing <2 g/kg/day was associated with a reduced risk of hypertriglyceridemia, whereas dosing >2 g/kg/day did not significantly alter risk. Continuous TG values were not consistently associated with major neonatal outcomes, including respiratory distress syndrome (RDS), bronchopulmonary dysplasia (BPD), necrotizing enterocolitis (NEC), or retinopathy of prematurity (ROP) in either cohort.
Discussion:
TG values in preterm infants vary by developmental stage, closely reflecting GA, BW, and postnatal age, suggesting that circulating TG levels are developmentally regulated. These findings support consideration of age- or weight-based TG reference ranges, particularly for infants born at 22-25 weeks' gestation. In contrast, the limited association between TG levels and neonatal morbidities raises questions regarding the relevance of early TG measurements for predicting later disease.
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