Overview
Reservoir systems include a reservoir bag, which allows for oxygen to accumulate between breaths. This allows for a higher concentration of oxygen to be inspired.
The oxygen that enters the reservoir bag is passively mixed with room air, and therefore the amount of oxygen delivered by these systems is variable depending on the patient's respiratory rate and tidal volume.
These systems are used acutely in severely hypoxic patients. They should not be used for more than a few hours as they do not supply humidified air and can cause dehydration of the upper airway.
Partial Rebreather Mask
A partial rebreather mask includes a reservoir bag, allowing for higher amounts of entrained oxygen. Unlike a non-rebreather mask, they do not contain an exhalation port and therefore the patient will rebreath some of their expired gas.
| Flow | FiO₂ |
| 7 L/min | ~0.65 |
| 8-10 L/min | ~0.80 |
Non-Rebreather Mask
A non-rebreather mask includes a reservoir bag and an exhalation port - preventing gas from being reinspired. This requires a tight seal over the patient's face.
| Flow | FiO₂ |
| 15L/min | Up to 0.90 |
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