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Delirium and dementia

How would one differentiate between delirium and dementia? What methods would you use to assess the presence of each? Provide the rationale for your response based on scientific evidence from a professional literature.

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Dementia is the deterioration of mental functioning (including, memory, concentration and judgment) resulting from a brain disorder, often accompanied by emotional disturbances and personality changes. Early symptoms include slight disturbances in a person's ability to grasp their current situations. As it progresses memory failure becomes more obvious resulting in a decline of an individual's short-term memory.

Delirium is a severe neuropsychiatric syndrome with core features of acute onset and fluctuating course, attentional deficits and generalized severe disorganization of behavior. It typically involves ...