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A non-rebreather mask (NRB, non-rebreather, non-rebreather facemask, etc.) is a device used in medicine to assist in the delivery of oxygen therapy. An NRB requires that the patient can breathe unassisted, but unlike low flow nasal cannula, the NRB allows for the delivery of higher concentrations of oxygen.
The non-rebreather mask is utilized for patients with physical trauma, chronic airway limitation, cluster headache, smoke inhalation, and carbon monoxide poisoning, or any other patients who require high-concentration oxygen, but do not require breathing assistance. Patients uncomfortable with having a mask on their face, such as those with claustrophobia, or patients with injuries to the mouth are more likely to benefit from a nasal cannula, or passive ("blow-by") oxygen.Patients who are unable to breathe on their own would require invasive or noninvasive mechanical ventilation.