This prospective, randomized controlled trial tested whether initiating iNO therapy earlier would reduce death and reduce the use of extracorporeal membrane oxygenation (ECMO) -- temporary lung bypass -- therapy compared with the standard recommendation threshold. Infants who were born at >34 weeks' gestation were enrolled when they required assisted ventilation and had an oxygenation index (OI) >15 and <25 on any 2 measurements in a 12-hour interval. Infants were randomized to receive either early iNO or to simulated initiation of iNO (control). Infants who had an increase in OI to 25 or more were given iNO as standard therapy. The neurodevelopment of the subjects were evaluated at 18-22 months corrected age.