What is a common indication for using supplemental oxygen therapy?

Supplemental oxygen therapy is primarily indicated in situations where patients are experiencing severe respiratory distress accompanied by cyanosis. Cyanosis is a bluish discoloration of the skin, particularly evident in the lips and extremities, indicating that there is inadequate oxygenation of the blood. When a patient displays these symptoms, it often points to significant hypoxemia, which can lead to further complications if not addressed swiftly. Administering supplemental oxygen helps improve tissue oxygenation and can prevent organ damage due to inadequate oxygen supply.

The other options describe scenarios that, while they may be connected to respiratory health, do not represent the primary clinical indications for supplemental oxygen therapy. Improved exercise capacity is an outcome that may benefit from oxygen therapy but is not a direct indication. Cost reduction does not relate to a clinical need for oxygen therapy and suggests a focus on economics rather than patient care. Lastly, managing anxiety disorders does not have a direct correlation with oxygen therapy, making it an inappropriate choice in this context.