Which device or method uses oxygen mixed with inhaled air to provide a specific oxygen concentration?

Which device or method uses oxygen mixed with inhaled air to provide a specific oxygen concentration?

• A. Ventilation
• B. Stoma
• C. Respiratory failure
• D. Venturi mask

Answer: (D)

Delivering a specific oxygen concentration requires mixing ambient air with supplemental oxygen. The Venturi mask is designed for this: it uses a small oxygen jet that creates a Venturi effect to entrain room air and blend it with the supplied oxygen, producing a set FiO2 determined by the mask adapter. This lets the patient receive a precise oxygen concentration (for example, around 24–50%) regardless of breathing pattern. Other options aren’t devices that mix air to a specific oxygen level—ventilation moves air in and out through a ventilator, a stoma is simply an opening, and respiratory failure is a condition rather than a delivery method.

Delivering a specific oxygen concentration requires mixing ambient air with supplemental oxygen. The Venturi mask is designed for this: it uses a small oxygen jet that creates a Venturi effect to entrain room air and blend it with the supplied oxygen, producing a set FiO2 determined by the mask adapter. This lets the patient receive a precise oxygen concentration (for example, around 24–50%) regardless of breathing pattern. Other options aren’t devices that mix air to a specific oxygen level—ventilation moves air in and out through a ventilator, a stoma is simply an opening, and respiratory failure is a condition rather than a delivery method.