Which NO dosing range is commonly used in pediatric nitric oxide therapy?

• A. 1-5 ppm
• B. 5-15 ppm
• C. 20-80 ppm
• D. 80-120 ppm

Answer: (C)

Inhaled nitric oxide therapy in children is dosed to achieve effective pulmonary vasodilation while watching for safety, so the dosing window you’ll see most often is mid to high range. Starting around 20 ppm is common because lower doses (just a few ppm) may not produce sufficient vasodilation in many neonates with pulmonary hypertension. If the response isn’t adequate, clinicians can increase the dose toward 80 ppm, which provides a stronger effect. However, higher doses raise the risk of toxicity, especially methemoglobinemia and nitrogen dioxide formation, so patients are closely monitored during titration. For these reasons, the range from about 20 to 80 ppm is the typical, commonly used window. Lower ranges are used when the disease is milder or testing tolerance, but they’re not the standard for therapeutic effect, and doses above 80 ppm are avoided due to safety concerns.