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non-rebreather mask

non·re·breath·er mask

/non′′rēbrēth′ər mask, mahsk/

Noun

An oxygen-delivery device that is fitted to the patient’s face. The mask has a nose and chin section, with a moldable metal tab on the nose section. The tab can be shaped to make the NRB snug against the patient’s nose. An elastic band goes behind the patient’s head to hold the mask on the face. The mask has two exhaust ports on its sides, each with a thin flap that act as a valve to allow air to escape the mask but not enter it. Near the chin section of the mask is a port, where an oxygen reservoir is attached. A tube extends from the reservoir that allows it to be attached to the oxygen regulator. The reservoir is filled with oxygen before the NRB is placed onto the patient’s face. The standard oxygen flow rate for the NRB is 10 to 15 lpm. Properly fitted, the NRB can deliver in excess of 90% inspired oxygen. As the patient exhales, a flap closes over the reservoir port, allowing carbon dioxide to exit the mask through side ports.