Which of the following is a sign of hypoxia?

Hypoxia, which is a condition characterized by insufficient oxygen in the body, can lead to significant changes in a person's mental status. As the body's oxygen supply dwindles, the brain—being highly sensitive to changes in oxygen levels—can start to malfunction. This often results in confusion, disorientation, or changes in behavior, making a change in mental status a key indicator of hypoxia.

Recognizing alterations in mental status can be crucial for timely intervention, as it allows for appropriate measures to restore adequate oxygenation and prevent further complications, such as loss of consciousness or brain injury. In contrast, increased energy levels or improved color in skin would suggest that the individual is receiving adequate oxygen, while a normal breathing rate does not necessarily indicate hypoxia, as someone can still experience low oxygen levels despite having a regular respiratory rate.