What is the primary function of a non-rebreather mask?

The primary function of a non-rebreather mask is to prevent the rebreathing of exhaled air. This design feature is crucial because it allows for a higher concentration of oxygen to be delivered directly to the patient. The mask is equipped with a one-way valve that prevents exhaled air from mixing with the oxygen being supplied. As a result, this facilitates the delivery of up to 90% oxygen concentration to patients who require significant oxygen support, such as those in respiratory distress or hypoxia.

While the non-rebreather mask does provide a high flow of oxygen, its distinctive mechanism primarily focuses on preventing the inhalation of exhaled carbon dioxide, making it especially effective for treating patients who are critically ill or have severely impaired breathing. It is often used in emergency situations where rapid and effective oxygenation is essential.