Which oxygen delivery system provides the highest concentration of oxygen?

The non-rebreather mask is designed to deliver the highest concentration of oxygen among the options listed. This system has a reservoir bag that allows for the storage of oxygen, which the patient inhales directly, minimizing the amount of room air that is mixed in. The mask features one-way valves to prevent exhaled air from entering the bag, thereby keeping oxygen levels high. When fitted properly, it can deliver oxygen concentrations of 60% to 100%, making it particularly effective for patients requiring significant respiratory support.

Other options, while useful in various clinical scenarios, do not provide the same level of oxygen concentration. The nasal cannula can offer up to 44% oxygen but is limited by the amount of flow that can be comfortably tolerated by the patient. The simple face mask provides a higher concentration than a nasal cannula but typically delivers less than the non-rebreather mask due to mixing with ambient air. The Venturi mask, while excellent for delivering precise and controlled oxygen concentrations, typically ranges from 24% to 50% oxygen, which is lower than what can be achieved with a non-rebreather mask.