Final answer:
A partial rebreather mask delivers approximately 60% to 75% FiO2, depending on factors like the patient's breathing pattern and the fit of the mask.
Step-by-step explanation:
A partial rebreather mask is a type of oxygen delivery system used in medical settings to help patients breathe more easily. The amount of FiO2, or fractional inspired oxygen, delivered by a partial rebreather mask typically ranges from about 60% to 75%. This higher FiO2 is achieved by allowing the patient to re-breathe some of the exhaled gas, which is mixed with new, incoming oxygen. Compared to non-rebreather masks, which can deliver up to 90% or more of FiO2, partial rebreather masks offer a somewhat lower level of oxygen, but still significantly higher than that of room air which contains approximately 21% oxygen.
The effectiveness of a partial rebreather mask in terms of FiO2 percentage can be influenced by a number of factors, including the patient's breathing pattern, the fit and seal of the mask, and the flow rate of oxygen being supplied. It's important for healthcare providers to monitor patients using these masks to ensure that they are receiving an appropriate concentration of oxygen for their specific medical needs.