If a patient cannot tolerate a non-rebreather mask, which oxygen delivery method should be used?

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When a patient can’t tolerate a high-flow mask, the aim is to keep delivering oxygen in the most comfortable way that still meets their needs. A nasal cannula fits that role well for spontaneously breathing patients. It’s lightweight, nonrestrictive, and allows talking and eating, so it’s easier for patients to tolerate over time. It provides a steady supply of oxygen at a moderate concentration, which is often sufficient when a non-rebreather mask isn’t an option because of intolerance.

The other choices are less ideal in this situation. A bag-valve mask with 100% oxygen is intended for patients who aren’t breathing adequately or need ventilation support, and it’s awkward for long-term oxygen delivery. A Venturi mask gives precise oxygen concentrations but uses a mask, which some patients find uncomfortable. A non-rebreather mask, while capable of delivering very high oxygen, isn’t usable if the patient cannot tolerate wearing it.