A nurse is assisting with the care of a client who has delirium. The client is disoriented and restless. Which of the following conditions should the nurse identify as a risk factor for delirium?

A. Amyloid plaque: Amyloid plaque buildup is characteristic of Alzheimer’s disease, a chronic, progressive form of dementia. While dementia can increase the overall risk for delirium, amyloid plaques themselves are not an immediate trigger for acute confusion like delirium. B. Urinary tract infection: Urinary tract infections are a common reversible cause of delirium, especially in older adults. Infections can trigger a systemic inflammatory response and disrupt normal brain function, leading to sudden-onset confusion, disorientation, and restlessness due to systemic inflammation and changes in metabolic balance. C. High cholesterol: High cholesterol contributes to long-term cardiovascular risks, such as atherosclerosis and stroke, but it is not directly linked to the sudden cognitive changes seen in delirium. It does not cause the acute neurological dysfunction characteristic of delirium. D. Hypersomnia: Hypersomnia, or excessive daytime sleepiness, may reflect underlying sleep disorders or other chronic conditions, but it is not recognized as a common direct cause of delirium. Acute changes in mental status are more often tied to factors like infection, medications, or metabolic disturbances.