A Increase the inspired oxygen concentration.

This is the Correct Answer

[Feedback :- As the altitude increases there is a decrease in the atmospheric pressure (from 760 mmHg at sea level to 640 mmHg at 1500 m). This decreases the amount of oxygen that is available. Although increasing the PIP and PEEP will also improve oxygenation, the most appropriate step is to simply increase the percentage of inspired oxygen.]

B Increase the peak inspiratory pressure (PIP).

[Feedback :- Increasing the PIP will improve oxygenation, but the most appropriate step is to simply increase the percentage of inspired oxygen.]

C Increase the peak end inspiratory pressure (PEEP).

[Feedback :- Increasing the PEEP will improve oxygenation, but the most appropriate step is to simply increase the percentage of inspired oxygen.]

D Increase the respiratory rate.

[Feedback :- The CO₂ level is satisfactory and respiratory rate does not need to be changed.]

E Ask the pilot to fly at 1500 m.

[Feedback :- Decreasing the actual altitude to 1500 m will make no difference if the cabin is already pressurized to that level.]