Which device is used in emergencies to deliver high concentrations of oxygen up to 90-95%?

Which device is used in emergencies to deliver high concentrations of oxygen up to 90-95%?

• A. Nasal Cannula
• B. Venturi Mask
• C. Non-Rebreather
• D. Simple Face Mask

Answer: (C)

Non-rebreather masks are designed to deliver the highest oxygen concentration among common delivery devices used in emergencies. The mask includes a reservoir bag that fills with oxygen and one-way valves on the sides so that the inhaled air mainly comes from the bag. Exhaled air exits through the side ports, preventing it from diluting the inspired oxygen. When the flow is set high (often around 10–15 L/min) the bag stays inflated, allowing you to achieve about 90–95% oxygen concentration, which is why this device is preferred in acute crises. Other options provide lower or more variable oxygen levels. A nasal cannula delivers only about 24–44% oxygen and is comfortable for longer use but not suitable for high concentrations. A venturi mask can deliver precise FiO2 but typically maxes out around 60% and is used when exact oxygen mixing is needed. A simple face mask usually provides roughly 40–60% depending on flow and fit, still not matching the high concentration possible with a non-rebreather.

Non-rebreather masks are designed to deliver the highest oxygen concentration among common delivery devices used in emergencies. The mask includes a reservoir bag that fills with oxygen and one-way valves on the sides so that the inhaled air mainly comes from the bag. Exhaled air exits through the side ports, preventing it from diluting the inspired oxygen. When the flow is set high (often around 10–15 L/min) the bag stays inflated, allowing you to achieve about 90–95% oxygen concentration, which is why this device is preferred in acute crises.

Other options provide lower or more variable oxygen levels. A nasal cannula delivers only about 24–44% oxygen and is comfortable for longer use but not suitable for high concentrations. A venturi mask can deliver precise FiO2 but typically maxes out around 60% and is used when exact oxygen mixing is needed. A simple face mask usually provides roughly 40–60% depending on flow and fit, still not matching the high concentration possible with a non-rebreather.