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Low sleep efficiency in patients with cognitive impairment
Jia-Ming Yu1, Ing-Jy Tseng, Rey-Yue Yuan
1Department of Neurology, Taipei Medical University, Taiwan.
Acta Neurologica Taiwanica
|August 14, 2009
Summary
Sleep quality is impaired in individuals with mild cognitive impairment (MCI) and Alzheimer's disease (AD). Polysomnography revealed lower sleep efficiency in these patients, independent of depressive symptoms.
Area of Science:
- Neurology
- Sleep Medicine
- Geriatrics
Background:
- Alzheimer's disease (AD) is a leading cause of dementia.
- Mild cognitive impairment (MCI) precedes dementia and involves cognitive decline.
- Sleep disturbances are common in AD and MCI patients, impacting quality of life.
Purpose of the Study:
- To investigate sleep architecture alterations in patients with mild AD and MCI.
- To compare sleep parameters between cognitive impairment groups and controls.
- To determine the relationship between sleep disturbances and depressive symptoms in cognitive decline.
Main Methods:
- Polysomnography (PSG) was performed on three groups: mild AD (N=10), MCI (N=12), and age-matched controls (N=13).
- Sleep efficiency and architecture were analyzed.
- Geriatric Depression Scale (GDS) and Epworth Sleepiness Scale (ESS) scores were assessed.
Main Results:
- Sleep efficiency was significantly lower in patients with MCI and AD (67.07% ± 19.10%) compared to controls (79.14% ± 11.06%), p=0.046.
- No significant differences in overall sleep architecture were found, but a trend towards REM sleep insufficiency was observed in MCI/AD groups.
- GDS and ESS scores did not differ significantly among the groups.
Conclusions:
- Sleep maintenance is impaired in individuals with cognitive impairment, including MCI and AD.
- This sleep impairment appears to be independent of depressive symptoms.
- Findings highlight the need for addressing sleep disturbances in cognitive impairment management.
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