An older adult with heart failure is being assessed. Which finding indicates delirium?

• A. Demonstrates obsessive behaviors
• B. Fluctuating level of orientation
• C. Consistent state of depression
• D. Family report of gradual memory loss

Answer: (B)

Delirium shows up as an acute change in mental status with a fluctuating level of attention and awareness. The hallmark is that orientation and responsiveness can swing—from alert and conversant to disoriented or drowsy—over hours to days. This fluctuating state distinguishes delirium from a steady cognitive decline and points to an acute, often reversible, disturbance in brain function, which is common in older adults with acute medical issues like heart failure.

Obsessive behaviors point to an anxiety or OCD-type pattern rather than an acute, fluctuating cognitive disturbance. A consistent state of depression suggests a mood disorder with more persistent affective symptoms. Gradual memory loss aligns with dementia, a chronic process with a steady decline rather than the abrupt, fluctuating change seen in delirium.