Q2. Which oxygen device can deliver up to 100% FiO₂ with humidification at 30–60 L/min?

Question

BlackTom AI · Accepted Answer

High-flow nasal cannula (HFNC) delivers heated, humidified oxygen at flows that can meet or exceed a patient’s inspiratory demand, allowing FiO2 up to 100% at flows typically between 30 and 60 L/min.

1) Relevant knowledge points and concepts
- FiO2: fraction of inspired oxygen; devices differ in the maximum FiO2 they can reliably deliver.
- Flow versus demand: when device flow meets/exceeds inspiratory demand, FiO2 is predictable and high.
- Humidification: high flows must be heated and humidified to maintain mucosal integrity and comfort.
- HFNC physiology: provides high flow (30–60 L/min), heated humidification, washes out dead space, and can generate low levels of positive airway pressure; accurately delivers FiO2 from 21% to 100%.

2) Step-by-step reasoning
- Requirement: a device that can deliver up to 100% FiO2 with humidification at 30–60 L/min.
- Check HFNC: designed for 30–60 L/min, heated humidification, and FiO2 adjustable up to 100% → meets all requirements.
- Check alternatives against the requirement.

3) Intermediate data/values
- Nasal prongs (standard low-flow): typically 1–6 L/min; approximate FiO2 range 24–44%; not humidified to the degree needed at high flows; cannot reach 30–60 L/min nor 100% FiO2.
- Venturi mask: provides precise, fixed FiO2 (commonly 24–50–60%) by entrainment, but cannot supply heated humidified flows of 30–60 L/min and does not reach 100% FiO2.
- Hudson mask (simple face mask): flows usually 5–10 L/min, FiO2 roughly 40–60%; not capable of 30–60 L/min or 100% FiO2 with humidification.

4) Why the correct answer is correct
HFNC is specifically engineered to deliver high flows (30–60 L/min), provide active heated humidification, and titrate FiO2 up to 100%, matching the stated requirements.

5) Why other options are incorrect
- Nasal prongs: low flow, limited FiO2, no high-flow humidification.
- Venturi mask: precise FiO2 but limited maximum FiO2 and not high-flow/humidified to 60 L/min.
- Hudson mask: intermediate FiO2 only, low flows, not designed for heated humidified high flows.

6) Conclusion
The device that meets all specified criteria is High-flow nasal cannula, which matches the provided answer.

Q2. Which oxygen device can deliver up to 100% FiO₂ with humidification at 30–60 L/min? 单项选择题

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