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Delirium and dementia

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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 ...