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Sleep state organization in premature infants of less than 35 weeks' gestational age
L Curzi-Dascalova1, J M Figueroa, M Eiselt
1INSERM, CJF 89-09, Hôpital A. Béclère, Clamart, France.
Insights
Premature infants as young as 27 weeks gestational age show sleep state differentiation. Artificial ventilation in neonatal intensive care units does not disrupt sleep organization in neurologically normal infants.
Area of Science:
- Neonatal Physiology
- Sleep Medicine
- Developmental Neuroscience
Background:
- Sleep organization is crucial for neurodevelopment in premature infants.
- Understanding sleep patterns in early development informs neonatal care practices.
Purpose of the Study:
- To evaluate sleep organization in premature infants under 35 weeks gestational age.
- To compare sleep patterns between artificially ventilated and non-ventilated premature infants.
- To investigate the impact of artificial ventilation on sleep states in neonates.
Main Methods:
- Polygraphic recordings were conducted on 24 neurologically normal neonates.
- Infants were grouped by gestational age (27-30 w GA and 31-34 w GA) and ventilation status.
- Sleep states were determined using electroencephalogram (EEG) and rapid eye movement (REM) criteria.
Main Results:
- Sleep state differentiation was observed as early as 27 weeks gestational age.
- Non-ventilated infants (31-34 w GA) exhibited longer sleep cycles, primarily due to extended active sleep periods.
- Artificial ventilation did not significantly alter sleep organization in neurologically normal premature infants.
Conclusions:
- Premature infants demonstrate sleep state differentiation from 27 weeks gestational age.
- Artificial ventilation in specialized neonatal intensive care units does not negatively impact sleep organization.
- Improved neonatal care may contribute to earlier observed sleep state differentiation.
Abstract:
To assess sleep organization in premature infants of < 35 wk gestational age (w GA), we performed polygraphic recordings in 24 neurologically normal neonates (eight per group): artificially ventilated 27-30 and 31-34 w GA infants and nonventilated 31-34 w GA infants. Sleep states were defined by concordance of EEG and rapid eye movement criteria. Uninterrupted active sleep periods of > 13 min and quiet sleep periods of > 5 min were observed in all babies, except in one 33 w GA ventilated infant. Intervals from the beginning of recording to the 1st quiet sleep period varied from 0 to 63 min and intervals to the beginning of the longest sleep cycle varied from 5 to 84 min. Nonventilated 31-34 w GA infants had longer sleep cycles (p < 0.02), principally because of longer active sleep periods. However, percentages of different states in the cycles were similar in all groups. When body movements were required for state definition, amounts of active and quiet sleep diminished and the percentage of indeterminate sleep was augmented significantly. In conclusion, our study demonstrated that 1) sleep state differentiation is present as soon as 27 w GA; and 2) artificial ventilation, performed in a highly specialized neonatal intensive care unit, does not modify sleep organization of neurologically normal premature infants. We hypothesize that this "earlier" sleep state differentiation, compared with previous data, may be related to improvements in neonatal intensive care over recent years.