Misidentifications and delusions in Alzheimer disease and dementia with Lewy bodies

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  • アルツハイマー病とレビー小体型認知症の誤認と妄想

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<p>In the early stage of dementia with Lewy bodies (DLB), 20% of patients have misidentifications (misidentifications of person, misidentification of place, "deceased/absent relatives are in the house", TV sign). In Alzheimer disease (AD), misidentifications are rare in the early stage, but often found in the advanced stage. Details of the misidentifications are similar between AD and DLB, but an ambiguous misidentification of person such as "I don't know who he/she is" is popular in AD.</p><p>Persecutory delusions are the most popular among delusions in dementia and found in 40% of AD, including delusion of theft, abandoned, and jealousy. 25% of the DLB patients also have persecutory delusions the details of which are similar to those in AD. Psychosocial factors often influence the details or target of persecutory delusions in AD. In addition, visual hallucinations or misidentifications of person can affect the details of persecutory delusions in DLB. DLB patients have delusion of jealousy more frequently than AD patients, because visual hallucinations and misidentifications of person in DLB patients can induce delusion of jealousy secondarily.</p>

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