What is the primary difference between a non-rebreather mask and a nasal cannula?

The primary distinction between a non-rebreather mask and a nasal cannula is that non-rebreather masks deliver a higher concentration of oxygen. Non-rebreather masks are designed to provide a significant amount of oxygen to the patient, typically offering concentrations greater than 90%. This is achieved through a reservoir bag connected to the mask, which fills with oxygen. As the patient inhales, they receive this concentrated oxygen while also preventing room air from entering due to the one-way valves that are part of the mask’s design. This makes non-rebreather masks particularly suitable for patients in critical conditions who require immediate and high concentrations of oxygen.

In contrast, nasal cannulas deliver lower concentrations of oxygen, usually ranging between 24% and 44%, depending on the flow rate and the patient's breathing pattern. While they are commonly used for less acute situations or for patients who require longer-term oxygen therapy, they may not provide the rapid and high concentration of oxygen that is essential in emergencies.

This capability of the non-rebreather mask makes it the preferred choice for situations where a quick and effective increase in oxygen saturation is necessary, such as in cases of severe respiratory distress or hypoxemia. Hence, the ability to deliver a higher concentration of oxygen