A nurse is reinforcing teaching about delirium with the caregiver of a client. Which of the following information should the nurse include?

A. "Individuals who have this disorder have a flat affect.": A flat affect is more commonly associated with mood disorders or schizophrenia rather than delirium. Delirium primarily affects attention, cognition, and perception, not emotional expression. B. "This disorder is characterized by a sudden onset of mental confusion.": Delirium is an acute, often reversible, condition marked by a rapid onset of confusion, disorientation, and fluctuating levels of consciousness. This sudden change distinguishes it from chronic cognitive disorders such as dementia. C. "Individuals who have this disorder speak at a slow pace.": Speech patterns in delirium are typically rapid, pressured, or incoherent rather than uniformly slow. Cognitive disorganization is more prominent than changes in speech rate. D. "This disorder is not reversible.": Delirium is often reversible if the underlying cause—such as infection, medication effects, or metabolic imbalance, is identified and treated promptly. Prognosis improves with early intervention.