Which type of oxygen delivery device provides the highest concentration of oxygen?

The non-rebreather mask is designed to deliver the highest concentration of oxygen to patients in respiratory distress or those who require high levels of supplemental oxygen. This device features a one-way valve that prevents exhaled air from re-entering the reservoir bag and allows for a significant amount of oxygen to be inhaled directly from the bag. The mask fits snugly over the patient's nose and mouth, which helps to minimize the mixing of ambient air.

Patients using a non-rebreather mask can receive oxygen concentrations of around 80% to 100%, making it the preferred choice in emergency situations where high-flow oxygen supplementation is crucial. This capability is particularly important for patients suffering from conditions such as severe respiratory distress, carbon monoxide poisoning, or any situation where optimal oxygenation is imperative for their survival.

In contrast, other devices such as the simple face mask and Venturi mask provide lower concentrations of oxygen due to their design and the way they deliver oxygen, mixing it with room air. The nasopharyngeal airway, while essential for maintaining airway patency, does not provide oxygen delivery and therefore is not comparable in terms of concentration.