What FiO2 range can a high flow high humidity nasal cannula deliver at flow rates up to 60 L/min?

What FiO2 range can a high flow high humidity nasal cannula deliver at flow rates up to 60 L/min?

• A. 0.40-0.90 FiO2
• B. 0.21-1.00 FiO2
• C. 0.28-0.60 FiO2
• D. 0.10-0.50 FiO2

Answer: (B)

High flow humidified nasal cannula systems can deliver a wide FiO2 range because the gas blend is precisely set by the device and delivered at high flow, which minimizes mixing with room air. At flow rates up to 60 L/min, you can set FiO2 from the level of room air (0.21) up to fully concentrated oxygen (1.00). This wide range reflects the ability to tailor oxygen delivery from minimal to maximal support as needed. The other ranges are more limited and don’t capture the capacity to reach 100% FiO2 with HFNC.

High flow humidified nasal cannula systems can deliver a wide FiO2 range because the gas blend is precisely set by the device and delivered at high flow, which minimizes mixing with room air. At flow rates up to 60 L/min, you can set FiO2 from the level of room air (0.21) up to fully concentrated oxygen (1.00). This wide range reflects the ability to tailor oxygen delivery from minimal to maximal support as needed. The other ranges are more limited and don’t capture the capacity to reach 100% FiO2 with HFNC.