What is the typical flow rate and oxygen concentration delivered by a nonrebreather mask?

The nonrebreather mask is designed to deliver high concentrations of oxygen to patients who are in respiratory distress. When oxygen is delivered at a flow rate of 15 liters per minute, it helps to ensure that the mask remains inflated and that the patient receives a high concentration of oxygen, often estimated to be up to 90%.

This high flow rate is crucial because it prevents the inhalation of room air, which could dilute the oxygen concentration. The design of the nonrebreather mask includes a reservoir bag that fills with oxygen; as the patient inhales, they primarily draw from this reservoir, maximizing their oxygen intake. This makes the nonrebreather mask an essential tool for paramedics and healthcare providers when immediate, high-flow oxygen therapy is required, particularly in cases of severe hypoxia or respiratory failure. Thus, the flow rate and concentration provided by a nonrebreather mask make option C the most accurate choice.