Which statement best describes delirium?

Which statement best describes delirium?

• A. Acute onset with fluctuating consciousness and is typically reversible
• B. Gradual onset with progressive memory decline
• C. Chronic neurodegenerative progression
• D. Always permanent and non-reversible

Answer: (A)

Delirium is an acute, fluctuating disturbance in consciousness and attention that arrives suddenly and often reverses when the underlying cause is treated. This abrupt change is key: delirium tends to come on quickly and the level of alertness can wax and wane, which distinguishes it from more slowly progressive cognitive disorders. It’s usually brought on by an acute medical issue such as infection, metabolic problems, or medication effects, and addressing the trigger can restore baseline function. This explains why the statement describing delirium as acute onset with fluctuating consciousness that is typically reversible best fits. In contrast, dementia presents with a gradual, progressive decline in memory and thinking over years, which is not reversible in the same way. The idea of chronic neurodegenerative progression points to dementia rather than delirium. And saying delirium is always permanent and non-reversible is incorrect because, with prompt identification and treatment of the underlying cause, delirium can often be reversed.

Delirium is an acute, fluctuating disturbance in consciousness and attention that arrives suddenly and often reverses when the underlying cause is treated. This abrupt change is key: delirium tends to come on quickly and the level of alertness can wax and wane, which distinguishes it from more slowly progressive cognitive disorders. It’s usually brought on by an acute medical issue such as infection, metabolic problems, or medication effects, and addressing the trigger can restore baseline function.

This explains why the statement describing delirium as acute onset with fluctuating consciousness that is typically reversible best fits. In contrast, dementia presents with a gradual, progressive decline in memory and thinking over years, which is not reversible in the same way. The idea of chronic neurodegenerative progression points to dementia rather than delirium. And saying delirium is always permanent and non-reversible is incorrect because, with prompt identification and treatment of the underlying cause, delirium can often be reversed.