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Between-sleep states transitions in premature babies
1INSERM, Service de Physiologie, Hôpital Robert-Debré, Paris, France. lilia.curzia@wanadoo.fr
Insights
Infant sleep transitions between active sleep (AS) and quiet sleep (QS) show a stable, organized pattern. Active sleep to quiet sleep transitions are longer than quiet sleep to active sleep transitions in premature infants.
Area of Science:
- Neonatal sleep research
- Developmental neuroscience
- Sleep physiology
Background:
- Understanding infant sleep state transitions is crucial for assessing neurological development.
- Previous research suggests well-defined sleep states in premature infants.
Purpose of the Study:
- To investigate the patterns of sleep state transitions in premature infants aged 30-36 weeks gestational age.
- To analyze the duration and sequence of transitions between active sleep and quiet sleep.
Main Methods:
- Utilized polysomnography (PSG) data from 25 healthy premature infants (30-36 weeks gestational age).
- Sleep states were coded using electroencephalogram (EEG) patterns and rapid eye movements (REMs).
- Multivariate linear models were employed for data analysis, accounting for subject clustering.
Main Results:
- Active sleep (AS) to quiet sleep (QS) transitions were significantly longer (median 4.8 min) than QS to AS transitions (median 1.7 min).
- Transition durations were independent of gestational age and recording method (paper vs. digitized PSG).
- A consistent sequence of parameter changes (REM and EEG) was observed during transitions.
Conclusions:
- Healthy premature infants (30-36 weeks GA) exhibit stable and organized between-sleep state transition patterns.
- Findings align with observations in full-term newborns, indicating consistent sleep organization at this developmental stage.
Abstract:
To assess the manner in which between-sleep state transitions occur in infants, we examined polysomnography (PSG) studies in 25 clinically and neurologically normal, appropriate-for-gestational-age, 30-to-36-week-gestational age (GA) infants. Twenty infants underwent paper PSG and five infants digitised PSG. Sleep states were coded based on concordance of REMs and the electroencephalogram (EEG) pattern. Data were analysed using a multivariate linear model, with the subject factor as a cluster. Duration of active sleep (AS) to quiet sleep (QS) transitions (median 4.8 min) was significantly longer than duration of QS to AS transitions (1.7 min) and was independent from GA and from the recording method (paper vs. digitized PSG). The sequence of modifications in parameters (REM and EEG) was invariable: REM cessation was the first change in AS to QS transitions, and REM appearance was the last change in the QS to AS transitions. Our study demonstrates a stable, well-organized pattern of between-sleep-states transitions in healthy 30-to-36-week GA premature infants. These findings are similar to those described in full-term newborns and are in agreement with our previous observations of well-defined sleep states at the age investigated here.