Rapid eye movement sleep deprivation in elderly patients with concurrent symptoms of depression and dementia
Abstract
Rapid eye movement (REM) sleep measures distinguish elderly patients with depression from those with dementia. The authors used a 2-night REM sleep deprivation (RSD) protocol to characterize patients with mixed symptoms of depression and dementia in comparison with patients with "pure" depression or dementia and healthy controls. Mixed-symptom patients resembled dementia patients in baseline sleep measures, but their large change in phasic REM activity following RSD suggests neurobiological similarities to depression. Mixed-symptom patients with stable cognitive impairment had greater REM sleep rebound than those with a more progressive dementing course. These results are consistent with previous neuropathological and neurochemical data.
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