What type of mask delivers the highest concentration of oxygen?

A non-rebreather mask is designed to deliver the highest concentration of oxygen to a patient. It typically features a bag that fills with oxygen, along with one-way valves that prevent the exhaled air from re-entering the bag. This setup allows for the delivery of oxygen concentrations of approximately 90% or more, which is particularly beneficial in emergency situations where a patient may be experiencing severe respiratory distress or hypoxia.

In contrast, while other mask types such as the simple face mask and nasal cannula provide supplemental oxygen, they generally do not achieve the same high concentrations due to their design and mechanisms for delivering oxygen. The simple face mask can deliver a concentration of 40-60%, whereas the nasal cannula typically delivers around 24-44% oxygen, depending on the flow rate. The Venturi mask is more precise in terms of delivering specific concentrations of oxygen to patients with chronic illnesses, but it typically allows for a lower overall oxygen concentration than the non-rebreather mask.

Thus, by utilizing the non-rebreather mask in acute settings, paramedics can effectively address life-threatening oxygen deficiency in patients.