Final answer:
The most crucial action for a nurse when dealing with a hospitalized older client who is unsteady and complains of dizziness with activity is to evaluate the client's medications, as they can significantly contribute to such symptoms.
Step-by-step explanation:
A hospitalized older client's complaint of dizziness with activity could stem from a range of issues, including medication side effects, fear of falling, muscular weakness, or the need for ambulatory assistance. Among the options provided, the most important initial action by the nurse would be to evaluate the client's medications. Medications can have side effects that cause dizziness and decreased steadiness, and older clients often take multiple prescriptions, which increases the risk of interactions and adverse effects. Additionally, assessing medication is a critical aspect of patient care that can reveal preventable causes of the patient's symptoms.
While the other options such as asking about fear of falling, performing lower extremity strength testing, and providing reassurance are valuable, they come after ensuring that the medication regimen is not contributing to the problem. Understanding the role of medications is an essential part of the nurse's assessment process when addressing a client's change in condition.