Abstract
In this study a large number of Rechtschaffen and Kales sleep characteristics, spectral measures, measures of complexity and interdependency measures were evaluated for sleep electroencephalograms (EEG) of 33 patients after ischemic stroke and 57 healthy subjects. The goal is to find measures effective in separation between normal sleep EEG and sleep EEG following stroke.
We found that stroke patients had higher sleep efficiency and they spent more time in slow wave sleep but less time in rapid eye movement sleep in comparison to healthy subjects. Moreover, the coherence between the C3-M2 and C4-M1 EEG channels was found to be lower for the patients, specifically in lower frequency bands. As concerns complexity measures, the sleep EEG of patients came out significantly less complex. This is consistent with the rising hypothesis about complexity decrease of the EEG after various types of brain damage.
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