Distribution of sleep and wakefulness EEG patterns in 24-h recordings of preterm and full-term newborns.
The aim of this study was to evaluate the organisation of EEG patterns in 24-h recordings of preterm and near-term neonates. In particular, the distribution of the different EEG codes at different postmenstrual ages (PMA) and the variations of sleep-related EEG pattern organisation was studied, during day (8.00 a.m.-8.00 p.m.) and night (8.00 p.m.-8.00 a.m.) time. The age of appearance of different neonatal EEG patterns, previously described in literature for short lasting records, was confirmed in this 24-h study. The medium-voltage continuous EEG pattern (pattern "3") was less represented approaching term age, in coincidence with the appearance of the two low-voltage continuous patterns ("1" and "2"), which are also related to active sleep and wakefulness. Discontinuous pattern ("7") was also less represented with age, but in day-time only. The percentage of time occupied by this pattern, related to quiet sleep, was significantly higher during day-time hours, than at night.
Biagioni
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Department of Developmental Neuroscience, Stella Maris Scientific Institute, University of Pisa, 56018 Calambrone, Pisa, Italy.
Boldrini
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A
Giganti
F
F
Guzzetta
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A
Salzarulo
P
P
Cioni
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G
D002940:Circadian Rhythm; D004569:Electroencephalography; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D012016:Reference Values; D012890:Sleep; D014851:Wakefulness