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Delirium versus Dementia versus Depression

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Consciousness
Delirium
Waxing and waning Consciousness
Dementia
Normal Consciousness
Depression
Normal Consciousness
Hallucinations and illusions
Delirium
Frequent Hallucinations and illusions
Dementia
Uncommon in mild - moderate dementia Hallucinations and illusions
Depression
Rarely with psychotic features Hallucinations and illusions
Onset
Delirium
Abrupt Onset
Dementia
Insidious Onset
Depression
Discrete Onset
Memory complaints
Delirium
Absent Memory complaints
Dementia
Hides or denies Memory complaints
Depression
Present Memory complaints
Responses
Delirium
Could be incoherent Responses
Dementia
Near-miss answers Responses
Depression
"I do not know” Responses