An older adult patient admitted for pneumonia suddenly becomes confused, disoriented, and agitated, experiencing fluctuations in consciousness throughout the day. The family reports this is a sudden change from their usual baseline. What condition should the nurse suspect?
✓ Correct Answer: Option C
Delirium is characterized by an acute onset, fluctuating consciousness, and changes in cognition and attention, often triggered by underlying medical conditions. This contrasts with the gradual onset of dementia.