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Many clinicians with different training and practice are involved in the care of persons with dementia. Whereas neurologists and psychiatrists focus their attention on the early phase of dementia, geriatricians and palliative care specialists are particularly involved at the end of demented patients' lives. To summarize the progress of knowledge in this field, it seems possible to answer four fundamental questions.

When? Several longitudinal studies of cohorts of demented and nondemented patients showed clearly that dementia is a risk factor for early death. There are no survival differences between Alzheimer's and Lewy body disease patients. Patients with vascular dementia have the worst prognosis. These results need to be analyzed with consideration of associated comorbidity, types and intensity of care, and dementia treatment.

Why? Studies conducted on the basis of …