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Behavioural changes and bioelectric brain maturation of preterm and fullterm newborn infants: a polygraphic study
Insights
Assisted ventilation in infants significantly impacts sleep patterns, increasing quiet sleep and instability. This research highlights reduced brain maturation in high-risk infants needing respiratory support.
Area of Science:
- Neonatal Medicine
- Neuroscience
- Sleep Medicine
Background:
- Infants requiring assisted ventilation may experience altered sleep-wake states.
- Understanding sleep state differentiation is crucial for assessing neonatal neurological development.
Purpose of the Study:
- To evaluate sleep states and cycles in preterm and fullterm infants requiring assisted ventilation.
- To compare sleep patterns between ventilated and non-ventilated infants.
- To assess the impact of risk factors and ventilation on bioelectric brain maturation.
Main Methods:
- Polygraphic recordings including EEG, eye movements, and body movements were used.
- A specialized method was validated for differentiating sleep states and cycles in infants.
- Infants were categorized by gestational age (preterm/fullterm) and risk status (low/high), with some requiring assisted ventilation.
Main Results:
- Infants needing assisted ventilation exhibited increased percentages of quiet and indeterminate sleep.
- Ventilated infants showed wider variability in sleep parameters, indicating unstable behavior.
- Bioelectric brain maturation significantly decreased with increasing risk in ventilated preterm and fullterm infants.
Conclusions:
- Assisted ventilation is associated with significant alterations in neonatal sleep architecture.
- Sleep instability and reduced brain maturation are key indicators of risk in ventilated infants.
- The findings underscore the importance of monitoring sleep in critically ill neonates.
Abstract:
Fifty-two preterm and fullterm infants requiring assisted ventilation were observed and examined polygraphically. In addition, 24 preterm infants without prenatal or perinatal complications and not needing assisted ventilation were examined polygraphically in order to validate a special method of differentiating sleep states and sleep cycles. State criteria were EEG records, eye movements and gross body movements. Using this evaluation method, all 14 low-risk preterm infants showed stable sleep states and cycles, as did 16 of 23 high-risk preterm and 10 of 15 high-risk fullterm infants. 11 high-risk preterm and fullterm infants were found to have extremely unstable sleep states, or were comatose. The EEG could not be evaluated in only one case. Infants requiring assisted ventilation showed the following changes in comparison with the infants who did not need ventilation: the percentage of quiet sleep increased significantly; the percentage of indeterminate sleep increased as a sign of more unstable behaviour; and the individual measurements of the recorded and observed variables showed wider variability. Bioelectric brain maturation decreased significantly with increasing risk among both preterm and fullterm infants given assisted ventilation.