Differences in cortisol levels between preterm and term infants: a systematic review and meta-analysis combined with Mendelian randomization study - Report - MDSpire
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Differences in cortisol levels between preterm and term infants: a systematic review and meta-analysis combined with Mendelian randomization study
Clinical Report: Comparative Analysis of Cortisol Levels in Preterm Versus Term Infants
Overview
This systematic review and meta-analysis found that preterm infants exhibit lower cortisol levels compared to term infants in umbilical cord blood and peripheral blood on the first day after birth. Mendelian randomization analysis indicated a negative causal association between preterm birth and cortisone levels.
Background
Cortisol is a critical biomarker of the stress response, and understanding its levels in preterm infants is essential due to their immature hypothalamic-pituitary-adrenal (HPA) axis. The controversy surrounding cortisol levels in preterm versus term infants has implications for neonatal care.
Data Highlights
Specimen Type
Effect Size (SMD)
95% CI
P-value
Umbilical Cord Blood
-0.45
-0.77 to -0.12
< 0.05
Peripheral Blood (Day 1)
-0.46
-0.91 to -0.02
< 0.05
Key Findings
Preterm infants have lower cortisol levels in umbilical cord blood compared to term infants.
Peripheral blood cortisol levels in preterm infants increase after two weeks, becoming comparable to term infants.
Salivary cortisol levels do not differ significantly between preterm and term infants.
Mendelian randomization analysis supports a negative causal association between preterm birth and cortisone levels.
Clinical Implications
The findings suggest that cortisol levels in preterm infants may initially be lower but can increase over time, which may influence treatment strategies in the neonatal intensive care unit. Understanding these dynamics is crucial for optimizing glucocorticoid therapies in this vulnerable population.
Conclusion
This study provides important insights into the cortisol dynamics in preterm infants, highlighting the need for tailored clinical approaches in managing their care. Further research is essential to refine treatment protocols based on these findings.
