Dementia with Lewy Bodies versus Alzheimer’s Disease and Parkinson’s Disease Dementia: A Comparison of Cognitive Profiles
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Background and Purpose:It is particularly difficult to differentiate dementia with Lewy bodies (DLB) from the related dementias of Alzheimer’s disease (AD) and Parkinson’s disease dementia (PDD). Few studies have been designed to comparatively analyze detailed neuropsychological assessments of DLB patients and patients with AD and PDD. Methods:Three groups of patients participated in this study: 10 with DLB, 76 with AD, and 17with PDD, who had been diagnosed as probable DLB, AD, and PDD, respectively, according to the clinical criteria of the consortium on DLB, National Institute of Neurological and Communicative Diseases and Stroke/Alzheimer’s Disease and Related Disorder Association, and the clinical diagnostic criteria for PDD. All patients were evaluated by careful neurological examination with detailed neuropsychological testing. Results:Significant differences among the three groups were found for attention, memory, and executive function, which included tasks of backward digit span, three-word recall, verbal delayed recall, and the Stroop test. Post hoc analysis revealed that the deficiencies of attention on the digit span task were greater in the DLB group than in the AD and PDD groups. The scores for episodic verbal memory tasks were significantly lower in the DLB and AD groups than in the PDD group. The performance in frontal executive function, as indicated by the Stroop test, was significantly worse in the DLB and PDD groups than in the AD group. Conclusions:The results of the present study show that the pattern of cognitive dysfunction, in terms of attention, episodic memory, and executive functions, differ between patients with DLB and patients with AD and PDD.
Abstract
Background and Purpose:It is particularly difficult to differentiate dementia with Lewy bodies (DLB) from the related dementias of Alzheimer’s disease (AD) and Parkinson’s disease dementia (PDD). Few studies have been designed to comparatively analyze detailed neuropsychological assessments of DLB patients and patients with AD and PDD. Methods:Three groups of patients participated in this study: 10 with DLB, 76 with AD, and 17with PDD, who had been diagnosed as probable DLB, AD, and PDD, respectively, according to the clinical criteria of the consortium on DLB, National Institute of Neurological and Communicative Diseases and Stroke/Alzheimer’s Disease and Related Disorder Association, and the clinical diagnostic criteria for PDD. All patients were evaluated by careful neurological examination with detailed neuropsychological testing. Results:Significant differences among the three groups were found for attention, memory, and executive function, which included tasks of backward digit span, three-word recall, verbal delayed recall, and the Stroop test. Post hoc analysis revealed that the deficiencies of attention on the digit span task were greater in the DLB group than in the AD and PDD groups. The scores for episodic verbal memory tasks were significantly lower in the DLB and AD groups than in the PDD group. The performance in frontal executive function, as indicated by the Stroop test, was significantly worse in the DLB and PDD groups than in the AD group. Conclusions:The results of the present study show that the pattern of cognitive dysfunction, in terms of attention, episodic memory, and executive functions, differ between patients with DLB and patients with AD and PDD.
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