Abstract
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.
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