Inhaled Nitric Oxide for the Treatment of Neonatal Hypoxic Respiratory Failure With Pulmonary Hypertension

This study is testing inhaled nitric oxide — a gas that helps open up blood vessels in the lungs — as a treatment for newborns who are having trouble breathing due to a condition called pulmonary hypertension (high blood pressure in the lungs) combined with low oxygen levels (hypoxic respiratory failure). **You may be eligible if...** - Your baby was born at 34 weeks of pregnancy or later - Your baby is less than 7 days old - Your baby is on a breathing machine due to low oxygen levels - Your baby has evidence of high lung blood pressure on an ultrasound of the heart **You may NOT be eligible if...** - Your baby's survival depends on blood flowing in the wrong direction through a heart defect - Your baby has a congenital heart defect (other than a small hole in the heart) - Your baby has a life-threatening birth defect (brain, heart, or chest) - Your baby has a chromosomal condition - Your baby needs emergency life support (ECMO) or is expected to die within 24 hours - Your baby has severe brain bleeding or blood clotting problems - Your baby is having active seizures on anti-seizure medication Talk to your doctor to see if this trial is right for you.