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[Do preterm infants differ from healthy newborns by endothelin para/endocrine function?].
Małgorzata Baumert1, Andrzej Wiecek, Franciszek Kokot
1Klinika Neonatologii III Katedry Połoznictwa i Ginekologii Sl. AM, Katowicach.
Summary
Preterm infants show higher levels of endothelin-1 (ET-1), nitric oxide metabolites (NOx), and von Willebrand factor (vWF). These elevated markers in preterm neonates may be linked to hypoxic conditions during delivery.
Area of Science:
- Perinatal medicine
- Neonatal physiology
- Vascular biology
Background:
- Endothelin-1 (ET-1), nitric oxide metabolites (NOx), and von Willebrand factor (vWF) are key regulators of vascular tone and hemostasis.
- Altered levels of these markers are implicated in various perinatal complications.
- Hypoxia is a significant stressor in preterm infants, potentially affecting cardiovascular and hemostatic systems.
Purpose of the Study:
- To compare plasma concentrations of ET-1, NOx, and vWF in maternal and umbilical cord blood across different delivery modes (spontaneous, elective cesarean, preterm).
- To investigate the correlation between these biomarkers and clinical outcomes, such as Apgar score, in preterm infants.
- To explore the potential role of hypoxia in modulating these vascular markers in preterm neonates.
Main Methods:
- Blood samples were collected from mothers and umbilical cords during delivery.
- Plasma concentrations of ET-1, NOx, and vWF were measured using appropriate assays.
- Infants were categorized into spontaneous (SN), elective cesarean (CC), and preterm delivery groups.
- Statistical analyses were performed to compare marker levels and assess correlations.
Main Results:
- Elevated plasma concentrations of ET-1 were observed in umbilical cord blood of preterm infants compared to healthy term infants (SN and CC).
- Higher levels of ET-1 were also found in systemic blood of preterm infants 4 days post-birth.
- Positive correlations were noted between ET-1 and NOx, and ET-1 and vWF in maternal blood of preterm deliveries.
- A negative correlation between ET-1 and Apgar score was observed in the umbilical cord blood of preterm infants.
Conclusions:
- Preterm delivery is associated with significantly higher levels of ET-1, NOx, and vWF in umbilical cord blood.
- These findings suggest that hypoxia may induce increased ET-1, NOx, and vWF concentrations in preterm infants.
- The observed correlations highlight a potential link between vascular dysfunction, hypoxia, and adverse outcomes in preterm neonates.