Which statement accurately describes an oronasal mask?

• A. Covers the nose and mouth with small vent holes to expel exhaled air and includes a breathing tube and connector.
• B. Delivers oxygen at a flow rate of 40-60 L/min.
• C. Is primarily used for invasive ventilation.
• D. Is used for noninvasive measurement of blood pressure.

Answer: (A)

An oronasal mask is a type of face mask that covers both the nose and mouth to deliver supplemental oxygen or ventilation noninvasively. It includes a tube that connects to the oxygen source and small vents to allow exhaled air to escape, preventing buildup of carbon dioxide and ensuring a comfortable, continuous breath for the patient. This setup is used for noninvasive oxygen delivery, not invasive ventilation which requires an artificial airway and a ventilator. It isn’t used to measure blood pressure. Flow rates of 40–60 L/min are associated with specialized high-flow systems, not a standard oronasal mask. So the description that matches is the one that notes it covers both nose and mouth, has vent holes for exhalation, and uses a breathing tube and connector.