Dementia and delirium are very similar due to the fact that they both experience some form of memory loss. The difference between the two is that while memory loss in dementia __________, memory loss in delirium __________.

Dementia usually causes a gradual, persistent decline in memory, so the memory loss is generally constant rather than changing sharply over a single day. Delirium often has a sudden onset and symptoms that fluctuate, so memory and attention can vary throughout the day. Therefore, the correct choice is “is usually constant . . . can fluctuate throughout the day.”

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