A nurse is caring for a client with severe hypoxemia and requires precise oxygen titration. Which oxygen delivery system would be most appropriate for this client?

Explanation: The Venturi mask is the most appropriate oxygen delivery system for clients with COPD as it provides a precise and controlled oxygen concentration. This system allows for a specific amount of room air to mix with oxygen, ensuring a precise oxygen level is delivered without the risk of excessive oxygen concentration.

Incorrect choices: a. Nasal cannula delivers a lower oxygen concentration and may not provide sufficient oxygen for clients with severe COPD.

c. Non-rebreather mask delivers a high concentration of oxygen, which can potentially worsen the client's condition by reducing respiratory drive.

d. Oxygen tent is not commonly used in COPD management and is typically reserved for pediatric clients or those with specific respiratory conditions.

Answer: d. CPAP mask

Explanation: A CPAP mask is the most appropriate oxygen delivery system for a client with sleep apnea who requires positive pressure ventilation. It delivers a continuous flow of air or oxygen at a constant pressure to keep the airway open during sleep.

Incorrect choices:

a. Nasal cannula does not provide positive pressure ventilation and is not suitable for addressing sleep apnea.

b. Venturi mask and c. Non-rebreather mask are not designed to deliver positive pressure ventilation and are not commonly used for sleep apnea management.