A non-rebreather mask is most effective at what flow rate?

A non-rebreather mask is designed to deliver high concentrations of oxygen to patients who are experiencing severe respiratory distress or are in critical condition. The optimal flow rate for a non-rebreather mask is between 10 to 15 liters per minute (LPM). At this flow rate, the mask can adequately fill the reservoir bag with oxygen, allowing the patient to inhale the oxygen with minimal dilution from room air.

Maintaining this flow rate ensures that the reservoir bag does not collapse when the patient inhales, which is essential for achieving the desired oxygen concentration. Such a high flow rate helps ensure a high fraction of inspired oxygen (FiO2), ideally reaching levels above 90%, which is critical for patients suffering from conditions such as hypoxia or respiratory failure.