Which oxygen delivery device provides FiO2 approximately 60–90%?

Which oxygen delivery device provides FiO2 approximately 60–90%?

• A. Venturi mask 24–50%
• B. Nasal cannula 24–44%
• C. Simple face mask 40–60%
• D. Partial rebreather mask 60–90%

Answer: (D)

The main idea here is understanding which oxygen delivery method can achieve the highest inspired oxygen fraction (FiO2) among common devices. A partial rebreather mask uses a reservoir bag that fills with oxygen-rich gas from the supply and allows some of the patient’s exhaled air to mix with fresh oxygen. When the flow is adequate and the bag stays inflated, the inhaled air contains a large amount of oxygen, typically yielding an FiO2 in the range of about 60–90%. This is higher than what the nasal cannula (roughly 24–44%) or a simple face mask (roughly 40–60%) can deliver, and it is higher than what a Venturi mask commonly provides (often set to lower fixed ranges, around 24–50% with standard adapters). Because of the reservoir and the way it feeds oxygen, the partial rebreather mask can achieve the higher end of FiO2 that's asked for in the question. So, it best matches the 60–90% FiO2 range.

The main idea here is understanding which oxygen delivery method can achieve the highest inspired oxygen fraction (FiO2) among common devices. A partial rebreather mask uses a reservoir bag that fills with oxygen-rich gas from the supply and allows some of the patient’s exhaled air to mix with fresh oxygen. When the flow is adequate and the bag stays inflated, the inhaled air contains a large amount of oxygen, typically yielding an FiO2 in the range of about 60–90%. This is higher than what the nasal cannula (roughly 24–44%) or a simple face mask (roughly 40–60%) can deliver, and it is higher than what a Venturi mask commonly provides (often set to lower fixed ranges, around 24–50% with standard adapters). Because of the reservoir and the way it feeds oxygen, the partial rebreather mask can achieve the higher end of FiO2 that's asked for in the question. So, it best matches the 60–90% FiO2 range.