Improving the identification of dementia with Lewy bodies in the context of an Alzheimer's-type dementia.

BACKGROUND: Dementia due to Alzheimer's disease (AD) and dementia with Lewy bodies (DLB) are the two most common neurodegenerative causes of dementia. They commonly occur together, especially in older people, but clinical identification of these diseases in dementia is difficult in such circumstances. We therefore conducted a study using cases with both comprehensive prospective clinical assessments and complete neuropathological examination to determine if it is possible to identify such mixed cases clinically and to determine features which may identify DLB in the presence of AD dementia. METHODS: At Newcastle Brain Bank we identified subjects who had a clinical diagnosis of dementia and who also had autopsy diagnoses of pure AD, pure DLB, or mixed AD+DLB. All subjects had undergone prospective longitudinal clinical assessments. Mixed AD+DLB patients met neuropathological criteria for both DLB (limbic/neocortical Lewy body disease) and AD (Braak stage V/VI and CERAD B/C). The records of these subjects were carefully reviewed by two specialists in old-age psychiatry blind to autopsy findings to determine baseline and final clinical diagnoses based on these detailed records. The presence of characteristic Lewy body symptoms and other clinical information was also recorded. RESULTS: Of 59 subjects included, 19 were AD, 18 DLB, and 22 mixed AD+DLB. At baseline no subjects were correctly identified as having mixed AD+DLB and by final diagnosis only 23% were identified. The only symptom which helped in identifying the presence of Lewy body disease in the context of a mixed AD+DLB dementia was complex visual hallucinations. CONCLUSIONS: Whilst the identification of DLB in the context of a dementia with an AD pattern is difficult, the emergence of complex visual hallucinations in the context of such a degenerative dementia suggests the presence of Lewy body disease and should encourage a careful assessment. Biomarkers appear likely to be necessary to help improve identification of different disease subtypes underlying dementia.

The basis, ethics and provision of palliative care for dementia: A review.

Interest in palliative care for people with dementia has been around for over two decades. There are clinical and ethical challenges and practical problems around the implementation of good quality palliative care in dementia. This narrative review of the literature focuses on the rationale or basis for services, some of the ethical issues that arise (particularly to do with artificial nutrition and hydration) and on the provision and implementation of services. We focus on the most recent literature. The rationale for palliative care for people with dementia is based on research and on an identified need for better clinical care. But the research largely demonstrates a paucity of good quality evidence, albeit particular interventions (and non-interventions) can be justified in certain circumstances. Numerous specific clinical challenges in end-of-life care for people with dementia are ethical in nature. We focus on literature around artificial nutrition and hydration and conclude that good communication, attention to the evidence and keeping the well-being of the person with dementia firmly in mind will guide ethical decision-making. Numerous challenges surround the provision of palliative care for people with dementia. Palliative care in dementia has been given definition, but can still be contested. Different professionals provide services in different locations. More research and education are required. No single service can provide palliative care for people with dementia.