Comparison of alterations in cerebral hemoglobin oxygenation in late life depression and Alzheimer's disease as assessed by near-infrared spectroscopy.


BACKGROUND:Patients with Alzheimer's disease (AD) often present with apathy symptoms resembling the decreased motivation observed in depressed patients. Therefore, differentiating the initial phase of AD from late life depression may be difficult in some cases. Near-infrared spectroscopy (NIRS) is a functional neuroimaging modality that uses near-infrared light to measure changes in hemoglobin concentration on the cortical surface during activation tasks. The objective of this study was to investigate differences in brain activation associated with late life depression and with AD by means of NIRS. METHODS:NIRS was performed in 30 patients with depression, 28 patients with AD, and 33 healthy controls, all aged 60 years or older. During two tasks, a verbal fluency task and a visuospatial task, changes in oxygenated hemoglobin concentration in the frontal and parietal cortices were investigated. RESULTS:In the visuospatial task, cortical activation was lower in the depressed group than in the AD group, and significant differences were observed in the parietal cortex. CONCLUSIONS:NIRS can detect differences in brain activation between patients with late life depression and those with AD. NIRS is a promising tool for the differential diagnosis of late life depression and AD.


Behav Brain Funct


Kito H,Ryokawa A,Kinoshita Y,Sasayama D,Sugiyama N,Ogihara T,Yasaki T,Hagiwara T,Inuzuka S,Takahashi T,Genno H,Nose H,Hanihara T,Washizuka S,Amano N




Has Abstract


2014-03-17 00:00:00










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    abstract:BACKGROUND:Several studies in the past have found that phonological processing is abnormal in children with dyslexia. Phonological processing depends on the phonological rules of the language learnt. Western languages do not have a good phoneme to grapheme correspondence while many of the Indian languages do have it. A...

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    authors: Winblad S,Lindberg C,Hansen S

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    pub_type: 杂志文章,随机对照试验


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    authors: Reser JE

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    journal_title:Behavioral and brain functions : BBF

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    journal_title:Behavioral and brain functions : BBF

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    journal_title:Behavioral and brain functions : BBF

    pub_type: 杂志文章


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    journal_title:Behavioral and brain functions : BBF

    pub_type: 杂志文章


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    更新日期:2006-08-23 00:00:00

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    journal_title:Behavioral and brain functions : BBF

    pub_type: 杂志文章


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    journal_title:Behavioral and brain functions : BBF

    pub_type: 杂志文章


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    journal_title:Behavioral and brain functions : BBF

    pub_type: 杂志文章


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