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The characterisation and impact of ‘fluctuating’ cognition in dementia with Lewy bodies and Alzheimer's disease

✍ Scribed by Clive Ballard; Matthew Walker; John O'Brien; Elise Rowan; Ian McKeith

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
63 KB
Volume
16
Category
Article
ISSN
0885-6230

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✦ Synopsis

Abstract

Background

Case reports and clinical observations suggest that fluctuating cognition (FC) is common in all the major dementias, particularly dementia with Lewy bodies (DLB) where it is one of three core clinical diagnostic features. The purpose of this study was to characterise FC and determine its impact upon activities of daily living.

Methods

Forty matched subjects (15 DLB, 15 AD, 10 elderly controls) were assessed using the activities of daily living scale (ADLD), the cognitive drug research (CDR) computerised neuropsychological test battery and a semi‐standardised assessment of FC. The CDR battery was completed three times across a 1‐week period, to evaluate variability in attention, visuospatial ability, working memory and delayed recall.

Results

There was a strong positive correlation between clinical FC scores and total mean ADLD. Measures of cognitive variability also demonstrated strong significant correlations with independent clinical severity ratings of FC across several cognitive domains. These associations were most powerful between attentional measures and clinical FC ratings.

Conclusions

Although attention is the cognitive domain which fluctuates most markedly, other cognitive domains are also affected. FC also has a significant independent impact on activities of daily living. Copyright © 2001 John Wiley & Sons, Ltd

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