When is it appropriate to use non-rebreather masks?

Using non-rebreather masks is appropriate primarily in emergencies for patients who are experiencing severe hypoxemia. This type of mask is designed to deliver high concentrations of oxygen, typically around 80-100%, which is crucial in scenarios where a patient's oxygen levels are critically low. The non-rebreather mask functions by creating a sealed environment around the patient's mouth and nose, preventing the inhalation of room air, which allows the patient to receive the highest possible concentration of oxygen directly from the source. This is essential in situations such as acute respiratory distress, carbon monoxide poisoning, or any other condition that results in a significant drop in oxygen saturation.

In contrast, using non-rebreather masks during routine oxygen therapy for all patients is not advisable, as the high level of oxygen can pose risks, particularly in stable patients or those with chronic respiratory conditions who often require more controlled oxygen delivery. Such patients are typically better suited for methods that deliver lower concentrations of oxygen, especially if their baseline oxygen levels are normal. Therefore, in emergency situations, non-rebreather masks become an essential tool in quickly addressing severe hypoxemia and stabilizing patients.