Which statement about high flow nasal cannula is true?

Which statement about high flow nasal cannula is true?

• A. It can heat gas to 37°C with 100% relative humidity and deliver FiO2 up to 1.00.
• B. It delivers FiO2 only up to 0.60.
• C. It cannot provide heated gas.
• D. It replaces all other oxygen devices.

Answer: (A)

High flow nasal cannula systems deliver heated, humidified oxygen at high flow, with the ability to provide the full range of oxygen concentrations up to 100%. The statement is true because HFNC heats the gas to about 37°C and humidifies it to near 100% relative humidity, while the FiO2 can be adjusted up to 1.0. This combination not only makes the gas comfortable to breathe but also helps meet the patient’s inspiratory demand and washes out nasopharyngeal dead space, which supports better oxygenation. It’s not limited to FiO2 of 0.60, and it does provide heated gas. HFNC does not replace all other oxygen devices; it’s used as an option or adjunct depending on the clinical needs.

High flow nasal cannula systems deliver heated, humidified oxygen at high flow, with the ability to provide the full range of oxygen concentrations up to 100%. The statement is true because HFNC heats the gas to about 37°C and humidifies it to near 100% relative humidity, while the FiO2 can be adjusted up to 1.0. This combination not only makes the gas comfortable to breathe but also helps meet the patient’s inspiratory demand and washes out nasopharyngeal dead space, which supports better oxygenation. It’s not limited to FiO2 of 0.60, and it does provide heated gas. HFNC does not replace all other oxygen devices; it’s used as an option or adjunct depending on the clinical needs.