What is the required flow rate of a non-rebreather mask to deliver pure oxygen effectively?

To effectively deliver pure oxygen, a non-rebreather mask requires a flow rate in the range of 10-15 liters per minute. This flow rate is essential for ensuring that the patient receives a sufficient concentration of oxygen while also preventing the re-inhalation of exhaled carbon dioxide.

The non-rebreather mask is designed with a reservoir bag that fills with oxygen, allowing the patient to draw oxygen from both the bag and the mask directly. If the flow rate is too low, the bag may not remain adequately inflated, which can lead to the patient inhaling room air instead of the concentrated oxygen needed.

By maintaining a flow rate within this range, the mask can effectively prevent the dilution of oxygen with ambient air, thereby maximizing the oxygen saturation of the patient's blood. Additionally, flow rates higher than this range may not significantly enhance oxygen delivery but could cause discomfort or unnecessary waste of oxygen. Thus, the recommended flow rate of 10-15 liters per minute strikes a balance that supports effective oxygen therapy.