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A non-rebreather mask is a medical device that helps deliver oxygen in emergency situations. It consists of a face mask connected to a reservoir bag thatÂ’s filled with a high concentration of oxygen. The reservoir bag is connected to an oxygen tank.The mask covers both your nose and mouth. One-way valves prevent exhaled air from reentering the oxygen reservoir.
A non-rebreather mask is used in emergency situations to prevent hypoxemia, also known as low blood oxygen.
Conditions that disrupt your lungs€™ ability to uptake oxygen or your heart’s ability to pump blood can cause low blood oxygen levels.

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