Which oxygen delivery device provides the highest concentration of oxygen?

The non-rebreather mask is designed to deliver the highest concentration of oxygen among the options presented. It typically provides an oxygen concentration of approximately 90% or greater. This device is equipped with a reservoir bag, which allows it to store a sufficient supply of oxygen and has one-way valves that prevent the exhaled air from entering the reservoir bag, ensuring that the patient inhales a more concentrated mixture of oxygen directly from the bag.

The effectiveness of the non-rebreather mask is critical in emergency situations where high levels of oxygen are required, such as in cases of severe respiratory distress or conditions like carbon monoxide poisoning. It’s important to note that the mask must be fitted properly to maintain an adequate seal around the face; if there are leaks, the oxygen concentration can drop significantly.

Other oxygen delivery devices, such as the nasal cannula and simple face mask, do not provide as high a concentration of oxygen because they allow for greater mixing of ambient air, which dilutes the oxygen the patient receives. The Venturi mask, while useful for delivering precise oxygen concentrations, generally provides lower overall concentrations compared to the non-rebreather mask, as it is designed to mix room air with a specific flow of oxygen for controlled delivery.