Final answer:
A nonrebreather mask delivers a high concentration of oxygen to the patient, typically around 90-100%.
Step-by-step explanation:
The nonrebreather mask is a type of oxygen mask that delivers a high concentration of oxygen to the patient. It is designed to prevent the patient from inhaling exhaled gases by using one-way valves. The mask has a reservoir bag that is filled with oxygen and allows the patient to breathe in only the oxygen from the bag. The FiO2, or fraction of inspired oxygen, delivered by a nonrebreather mask is typically around 90-100%.
The nonrebreather mask delivers a high concentration of oxygen, usually around 90% to 100% of pure oxygen, or FiO2. This is made possible by the mask’s design, which includes a reservoir bag that is attached to an oxygen supply. With each breath the patient takes, they will inhale oxygen from both the reservoir and the direct oxygen supply. This is why a nonrebreather mask is considered to be one of the best methods for delivering a high FiO2 when compared to other types of oxygen delivery systems, especially important in situations demanding rapidly increased oxygen levels in the blood, such as carbon monoxide poisoning. The exact FiO2 delivered can vary based on the fit of the mask, the patient’s breathing pattern, and the flow rate of oxygen delivered to the reservoir.