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Postheparin lipolytic activity and Intralipid clearance in very low-birth-weight infants
Insights
Heparin administration transiently increased lipolytic activity in preterm infants receiving Intralipid. However, heparin did not significantly alter overall triglyceride or FFA levels during the infusion, indicating a limited impact on Intralipid clearance.
Area of Science:
- Neonatal Medicine
- Pharmacology
- Biochemistry
Background:
- Premature infants often require Intralipid for nutrition.
- Heparin is used to maintain IV line patency and may affect lipid metabolism.
- Understanding heparin's effect on lipid clearance in preterm infants is crucial for safe nutritional support.
Purpose of the Study:
- To investigate the effect of a heparin bolus on serum lipolytic activity, triglyceride, and free fatty acid (FFA) levels during Intralipid infusion in preterm infants.
- To compare these effects based on gestational age.
Main Methods:
- 18 AGA infants (25-32 weeks' gestation) received a 4-hour Intralipid infusion.
- Serum lipolytic activity (PHLA), triglycerides (TG), and FFA were measured at multiple time points.
- A bolus of heparin (10 U/kg) was administered intravenously before measurements.
Main Results:
- Peak post-heparin lipolytic activity (PHLA) was higher in infants aged 27-32 weeks compared to those aged 25-26 weeks.
- PHLA returned to baseline within 2 hours in all infants.
- Infants aged 25-26 weeks had higher baseline and infusion TG levels.
- FFA showed a transient rise post-heparin, but overall TG and FFA levels were not significantly different with or without heparin at the end of infusion.
Conclusions:
- A single heparin bolus has a transient effect on lipolytic activity in preterm infants.
- Heparin does not significantly alter Intralipid clearance over a 4-hour infusion period.
- Gestational age influences the lipolytic response to heparin in preterm infants.
Abstract:
The effect of heparin (10 U/kg) on serum lipolytic activity, triglyceride and FFA levels, during four hours infusion of 0.5 gm/kg Intralipid was measured in 18 AGA infants, 25 to 32 weeks' gestational age. PHLA, TG, and FFA were measured at 0, 10, 30, 120, and 240 minutes of infusion of Intralipid, before and following a bolus of 10 U/kg heparin iv. Lipolytic activity, measured by hydrolysis of activated tri-3H-oleate and expressed in mumol FFA released per milliliter serum per hour, was not detected in serum before heparin administration. Ten minutes after heparin administration peak PHLA was significantly higher in infants of 27 to 32 weeks' gestation than in infants of 25 to 26 weeks' gestation. There was no significant difference in peak PHLA between infants of 27 to 28 and 29 to 32 weeks' gestation. PHLA returned to baseline (zero) two hours after heparin administration in all infants. Infants of 25 to 26 weeks' gestational age had significantly higher concentrations of serum triglycerides before and during Intralipid infusion than in infants of 27 to 32 weeks' gestational age. Although there was a transient rise in FFA 10 and 30 minutes after heparin administration, the levels of FFA and triglycerides were not different at the end of infusion with or without heparin in either group, suggesting that a single bolus of heparin has only a transient effect on Intralipid clearance.