What is the appropriate action for a 93-year-old female who experiences sudden difficulty breathing but appears stable?

In the scenario of a 93-year-old female experiencing sudden difficulty breathing but appearing stable, administering oxygen by nasal cannula is an appropriate action. This approach allows for the delivery of supplemental oxygen to help alleviate hypoxia without overwhelming the patient, especially since she is stable. The nasal cannula provides a low flow of oxygen, which can improve her oxygen saturation levels without causing further respiratory distress.

Using a non-rebreather mask would typically be reserved for patients who are in more acute respiratory distress or who exhibit severe hypoxia. Since the patient appears stable, starting with a less invasive method like the nasal cannula is prudent.

Administering aspirin is not relevant in this situation as it is primarily used for chest pain associated with suspected cardiac events rather than respiratory issues. Assisting with the administration of nitroglycerin may also not be appropriate here without further indications of cardiac distress, as nitroglycerin is used to manage angina and heart-related issues rather than immediate respiratory difficulties. Thus, the selected action effectively addresses the patient's needs while considering her stability and condition.