Based on trial data, nitric oxide is not recommended for premature neonates with a gestational age less than or equal to how many weeks?

• A. 30 weeks
• B. 34 weeks
• C. 32 weeks
• D. 28 weeks

Answer: (B)

Inhaled nitric oxide works best in term or near-term infants with conditions like persistent pulmonary hypertension because it helps dilate the pulmonary vessels and improve oxygenation. In premature neonates, however, the lungs are immature and the causes of respiratory distress are different, so trials have not shown a clear benefit from iNO. Large randomized studies and meta-analyses have found no improvement in survival or reduction in chronic lung disease for infants born at or before 34 weeks, and there is concern about potential harms such as intraventricular hemorrhage. Because of this, guidelines do not recommend routine use of nitric oxide in premature neonates at or below 34 weeks gestation.