What is the FiO2 range for the air entrainment (venturi) mask?

What is the FiO2 range for the air entrainment (venturi) mask?

• A. 0.21-0.50
• B. 0.32-0.65
• C. 0.40-0.80
• D. 0.24-0.60

Answer: (D)

The air-entrainment (Venturi) mask is designed to deliver a precise, fixed oxygen concentration by mixing a specific amount of oxygen with room air through fixed entrainment ports. The FiO2 you can obtain with this setup spans roughly 0.24 to 0.60. The lower end (about 24%) is used when only a small boost above room air is needed, while the higher end (up to about 60% with certain adapters) is used for greater oxygenation needs. The exact FiO2 is determined by the color-coded orifice adapter, which fixes the entrainment ratio and keeps the delivered concentration stable despite changes in the patient’s breathing. So, the range 0.24–0.60 best matches how venturi systems are configured and used.

The air-entrainment (Venturi) mask is designed to deliver a precise, fixed oxygen concentration by mixing a specific amount of oxygen with room air through fixed entrainment ports. The FiO2 you can obtain with this setup spans roughly 0.24 to 0.60. The lower end (about 24%) is used when only a small boost above room air is needed, while the higher end (up to about 60% with certain adapters) is used for greater oxygenation needs. The exact FiO2 is determined by the color-coded orifice adapter, which fixes the entrainment ratio and keeps the delivered concentration stable despite changes in the patient’s breathing. So, the range 0.24–0.60 best matches how venturi systems are configured and used.