A reservoir mask with OPEN exhalation ports indicates which mask type?

A reservoir mask with OPEN exhalation ports indicates which mask type?

• A. Non-rebreather
• B. Partial rebreather
• C. Simple mask
• D. Nasal cannula

Answer: (B)

A reservoir mask with open exhalation ports is designed to deliver a higher amount of oxygen than a simple mask by allowing some of the exhaled air to fill the reservoir and be rebreathed on the next breath. The open ports let the rest of the exhaled air escape, so not all of the exhaled air is trapped. This combination—a reservoir that provides part of the inspired air plus the opportunity to rebreathe a portion of that air—is the hallmark of a partial rebreather mask. It gives a moderate-to-high FiO2, less than a non-rebreather that uses a valve to prevent any rebreathing. In contrast, a simple mask has no reservoir to rebreathe from, and a nasal cannula delivers even lower FiO2.

A reservoir mask with open exhalation ports is designed to deliver a higher amount of oxygen than a simple mask by allowing some of the exhaled air to fill the reservoir and be rebreathed on the next breath. The open ports let the rest of the exhaled air escape, so not all of the exhaled air is trapped. This combination—a reservoir that provides part of the inspired air plus the opportunity to rebreathe a portion of that air—is the hallmark of a partial rebreather mask. It gives a moderate-to-high FiO2, less than a non-rebreather that uses a valve to prevent any rebreathing. In contrast, a simple mask has no reservoir to rebreathe from, and a nasal cannula delivers even lower FiO2.