Which type of mask delivers oxygen at a concentration of 24-50%?

The Venturi mask is specifically designed to provide a controlled concentration of oxygen, which can range from approximately 24% to 50%, depending on the adapter in use. This mask uses a system of various sized ports that allow room air to mix with the oxygen being delivered, thereby allowing for precise control of the oxygen concentration inhaled by the patient. This is particularly useful in patients who require specific oxygen levels, such as those with chronic obstructive pulmonary disease (COPD), to avoid complications from delivering too much oxygen.

While the other options provide mechanisms for oxygen delivery, they do not offer the same level of concentration control. For instance, a simple face mask can deliver oxygen concentrations from 40% to 60%, but it lacks the precision found with a Venturi mask. Nasal cannulas provide lower concentrations, typically from 24% to 44%, while nonrebreather masks are designed for higher oxygen delivery, typically around 60% to 100%. Therefore, the Venturi mask’s ability to precisely adjust oxygen concentration makes it the correct choice for the specified range of 24-50%.