Optimal Oxygen Levels for Preterm Infant Resuscitation

To the Editor I am writing in response to the article by Sotiropoulos et al.1 The authors present a compelling analysis indicating that high initial fraction of inspired oxygen (FiO2; ≥0.90) may reduce mortality in preterm infants compared to low (≤0.3) or intermediate (0.5-0.65) FiO2.