Which oxygen delivery device is likely to provide the highest concentration of oxygen?

The non-rebreather mask is specifically designed to deliver the highest concentration of oxygen to a patient. This device has a one-way valve that allows oxygen to flow from a reservoir bag into the mask while preventing exhaled air from re-entering the bag. As a result, it provides a higher oxygen concentration, typically around 80-90%, which is crucial for patients who are experiencing severe respiratory distress or require immediate oxygen support.

In contrast, other devices like the nasal cannula typically provide a lower concentration of oxygen, generally between 24% to 44%, depending on the flow rate. The Venturi mask, while useful for delivering a precise concentration of oxygen, often administers a lower concentration than a non-rebreather mask due to its design, which mixes oxygen with ambient air. The pocket mask is primarily used for providing rescue breaths during CPR and allows for some oxygen delivery, but again, it does not match the concentration that of a non-rebreather mask.

Overall, the design and function of the non-rebreather mask are what make it the optimal choice for delivering the highest concentration of oxygen in emergency situations.