When would you provide a nasal cannula instead of a rebreather face mask?

A nasal cannula is typically provided instead of a rebreather face mask when a patient requires lower levels of supplemental oxygen, generally in situations of mild to moderate hypoxemia or for long-term use. It allows for more patient comfort and mobility, as it does not cover the entire face. Additionally, a nasal cannula is preferred when the patient is able to breathe comfortably on their own and does not require a high concentration of oxygen. In cases where high flow oxygen is necessary, a rebreather mask would be more appropriate.