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Sleep patterns and mortality among elderly patients in a geriatric hospital
1Department of Geriatric and Respiratory Medicine, Tohoku University School of Medicine, Sendai, Japan.
Background:
Sleep disturbance is one of the major and unsolved problems in older people. Most of the previous sleep studies rely on self-reported documents, and memory disturbance in older people might bias sleep complaints and health status.
Objective:
Sleep disturbances were studied as a mortality risk.
Methods:
In 272 patients who were aged, infirmed and chronically institutionalized in a skilled-care geriatric hospital, the presence or absence of sleep disturbances were examined by hourly observations of patients over 2 weeks at baseline, and they were prospectively followed up for 2 years to assess mortality.
Results:
Mortality after 2 years was significantly higher in the nighttime insomnia, daytime sleepiness, and sleep-onset delay groups. Further, adjusted for age, gender and activities of daily living status, the presence of nighttime insomnia and sleep-onset delay remained associated with a higher risk of mortality.
Conclusion:
Sleep disturbance may be one of the symptoms indicating poor health or functional deficits, and be an independent risk factor for survival.