An older client recently transferred to a rehabilitation facility after aortic valve replacement surgery is experiencing anxiety and difficulty adjusting to the transition. The healthcare provider prescribes an antidepressant and a mild sedative for sleep. Which intervention is most important for the nurse to include in the client's plan of care?

Choice A: Obtain a blood pressure reading before the client gets out of bed. This is the most important intervention, as it can prevent or detect orthostatic hypotension, which is a drop in blood pressure when changing position from lying to standing. Orthostatic hypotension can cause dizziness, fainting, or falls, and it can be caused by medications, dehydration, or cardiac problems.

Choice B: Monitor and record the client's urinary output every day. This is not the most important intervention, as it does not address the client's anxiety or adjustment issues. The urinary output should be monitored for signs of fluid balance, kidney function, or infection, but it is not a priority for this client.

Choice C: Provide the client with teaching regarding a cardiac diet. This is not the most important intervention, as it does not address the client's anxiety or adjustment issues. The cardiac diet should be taught to promote heart health, lower cholesterol, and reduce sodium intake, but it is not a priority for this client.

Choice D: Assess the client's vital signs every 4 hours when awake. This is not the most important intervention, as it does not address the client's anxiety or adjustment issues. The vital signs should be assessed for signs of infection, pain, or hemodynamic instability, but they are not a priority for this client.