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7 - Neuropsychiatric features of dementia

Published online by Cambridge University Press:  31 July 2009

Bruce L. Miller
Affiliation:
University of California, San Francisco
Bradley F. Boeve
Affiliation:
Mayo Foundation, Minnesota
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Summary

Introduction

Neuropsychiatric symptoms are a common problem in dementia. Epidemiological studies indicate that approximately 60% of demented subjects in the community exhibit some degree of psychopathology. Among specific populations of subjects diagnosed with frontotemporal dementia (FTD) or advanced Alzheimer's disease (AD), the prevalence of behavioral pathology increases to 95%. The most frequently reported behavioral symptoms include apathy, agitation and depression.

The significant contributions of neuropsychiatric symptoms to the more common dementia syndromes are reflected by their prominent role in the diagnosis of these conditions. Behavioral symptoms are primary components of the diagnostic criteria for FTD and dementia with Lewy bodies (DLB) and are among the secondary supportive factors in the diagnostic criteria for AD and vascular dementia (VaD). Disturbances in behavior have also been reported in mild cognitive impairment (MCI), Parkinson's disease with dementia (PDD), progressive supranuclear palsy (PSP) and corticobasal degeneration (CBD).

While the severity of a dementing illness is often determined using cognitive criteria, behavioral disturbances are responsible for a substantial proportion of the morbidity caused by different dementia syndromes. Caregivers for patients with dementia find behavioral abnormalities significantly more troubling than cognitive deficits. The presence of neuropsychiatric symptoms correlates with increased rates of institutionalization, cost of care and caregiver stress and burden.

The behavioral disruptions seen in dementia are not simply an inevitable consequence of worsening cognitive impairment. Although neuropsychiatric symptoms are often seen with greater frequency and severity in the later stages of dementing illnesses, the clinical course of different behavioral symptoms is often heterogeneous and does not correlate closely with the severity of cognitive or functional impairment.

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Publisher: Cambridge University Press
Print publication year: 2009

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