Study Links Intrauterine Inflammation to Skin Barrier Weakness in Extremely Preterm Infants

TEWL measures how effectively the skin retains water, with most adults experiencing minimal loss. However, for infants born at the threshold of viability, the skin's outer layer is often not fully developed, resulting in higher water loss. Prior research showed that infants born at 24 and 25 weeks faced significant evaporative losses that could affect their fluid balance, temperature, and blood chemistry.

Chorioamnionitis has been associated with various neonatal complications, including lung injury and developmental delays, raising concerns about its impact on skin barrier functionality in newborns. To explore this, the Dublin team monitored the TEWL of thirty-seven extremely preterm infants on days one, three, and fourteen of life, using a standardized methodology to eliminate variations caused by humidity and handling. Examination of placentas allowed the team to classify the infants based on the presence and severity of inflammation.

Overall, babies exposed to chorioamnionitis showed higher water loss on their first day. However, when adjusting for gestational age, the observed difference was not statistically significant. Notably, a significant interaction was found between gestational age and chorioamnionitis in infants born at or below approximately 25 weeks, suggesting that inflammation primarily affected the skin barrier in the most immature infants.

The study's findings indicate that the skin barrier's development timeline intersects with the effects of fetal inflammation. For babies born at 25 weeks, whose skin barrier is rudimentary, exposure to inflammation could drastically impair their ability to retain water. In contrast, slightly more developed infants might withstand similar inflammatory conditions with less impact on water loss.

The researchers also noted a connection between higher TEWL and postnatal instability, suggesting a potential feedback loop where a compromised skin barrier negatively affects the infant's stability and, in turn, influences further skin maturation. While TEWL was observed to decrease between days one and fourteen, hinting at skin development, the first day's discrepancies between exposed and unexposed infants were notable.

The implications of this research are significant in clinical settings, where managing fluid balance in extremely preterm infants is critical. Excessive water loss can lead to dehydration and complications, particularly in infants with immature barriers.

This exploratory study, comprising a small cohort, opens avenues for tailored care for infants affected by chorioamnionitis. Although the findings are complex and warrant further research, they suggest that intrauterine inflammatory environments could substantially influence skin development and the overall stability of extremely preterm infants.