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 then nurse identify as a risk factor for delirium?

Delirium is a sudden change in mental status characterized by confusion, disorientation, and altered attention. It is often reversible and typically caused by an underlying medical condition rather than a primary psychiatric disorder. Common triggers include infections, metabolic imbalances, medications, and acute illness, especially in older adults. Identifying and treating the underlying cause is essential to resolving delirium. Rationale: A. Hypersomnia is not a recognized risk factor for delirium, although sleep disturbances may occur as a symptom once delirium develops. Delirium is more commonly associated with acute physiological stressors rather than isolated sleep pattern changes. Therefore, hypersomnia does not directly contribute to its onset. B. Amyloid plaque is associated with Alzheimer’s disease, which is a chronic neurodegenerative disorder rather than an acute condition. Although dementia increases vulnerability to delirium, amyloid plaque itself is not an acute risk factor. Delirium develops due to sudden physiological disturbances, not long-term structural brain changes alone. C. Urinary tract infection is a common precipitating factor for delirium, especially in older adults. Infections trigger systemic inflammatory responses that affect brain function, leading to confusion and altered cognition. Even mild infections can significantly impact mental status in vulnerable clients, making this a key risk factor. D. High cholesterol is a long-term cardiovascular risk factor but is not directly associated with the development of delirium. It contributes to atherosclerosis over time but does not cause acute changes in brain function. Therefore, it is not considered a risk factor for delirium onset.