Blood gases and retinopathy of prematurity: the ELGAN Study

Area of Science:

• Neonatalogy
• Ophthalmology
• Perinatology

Background:

• Retinopathy of prematurity (ROP) is a significant cause of visual impairment in premature infants.
• Blood gas derangements in the early postnatal period are common in extremely preterm infants.
• The association between early blood gas abnormalities and ROP severity requires further investigation.

Purpose of the Study:

• To test the hypothesis that preterm infants with blood gas derangements on at least two of the first three postnatal days are at increased risk for more severe ROP.
• To identify specific blood gas parameters (PCO2, pH, PaO2) associated with ROP development and severity.

Main Methods:

• A cohort of 1,042 infants born before 28 weeks' gestational age (GA) was analyzed.
• Infants were classified as 'exposed' if their blood gas measures fell in the highest or lowest quartile for GA on at least two of the first three postnatal days.
• Multivariable models were used to adjust for potential confounders.

Main Results:

• Exposure to high partial pressure of carbon dioxide (PCO2) quartile was associated with increased odds of ROP (stage 3-5, OR=1.6; zone 1, OR=2.0).
• Low pH quartile exposure showed increased risk for ROP in zone 1 (OR=2.1) and prethreshold/threshold disease (OR=1.8).
• High partial pressure of oxygen (PaO2) quartile was linked to a doubled risk of ROP in zone 1 (OR=2.5) and prethreshold/threshold disease (OR=2.1).

Conclusions:

• Early postnatal exposure to abnormal blood gases, specifically high PCO2, low pH, and high PaO2, is associated with an increased risk of developing more severe retinopathy of prematurity.
• These findings highlight the importance of vigilant monitoring and management of blood gases in extremely preterm infants to mitigate ROP risk.
• Further research may explore targeted interventions to normalize blood gases and prevent severe ROP outcomes.