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Unobtrusive sleep state measurements in preterm infants - A review
Jan Werth1, Louis Atallah2, Peter Andriessen3
1Department of Electrical Engineering, University of Technology Eindhoven, De Zaale, 5612 AJ Eindhoven, The Netherlands; Philips Research, High Tech Campus 34, 5656 AE Eindhoven, The Netherlands.
Insights
Monitoring sleep states in preterm infants is crucial for brain development. This review explores unobtrusive methods to assess active sleep, quiet sleep, and intermediate sleep without disturbing infants.
Area of Science:
- Neonatal development
- Sleep science
- Neuroscience
Background:
- Sleep is vital for preterm infant brain development, facilitating neural connections and regional maturation.
- Preterm infants exhibit distinct sleep states: active sleep (AS), quiet sleep (QS), and intermediate sleep (IS).
- Changes in sleep state duration and organization are key indicators of neurological development.
Purpose of the Study:
- To review unobtrusive methods for identifying preterm infant sleep states.
- To analyze physiological characteristics associated with different sleep states.
- To evaluate methods for measuring these characteristics and propose recommendations for neonatal sleep monitoring.
Main Methods:
- Review of existing literature on preterm infant sleep states and monitoring techniques.
- Analysis of physiological signals indicative of active sleep, quiet sleep, and intermediate sleep.
- Evaluation of the advantages and disadvantages of various non-invasive monitoring methods.
Main Results:
- Polysomnography (PSG) is a common method but can disturb sleep due to adhesive electrodes and cables.
- Unobtrusive methods are being explored to overcome the limitations of traditional PSG.
- Physiological characteristics vary across different sleep states, offering potential for non-invasive detection.
Conclusions:
- Accurate sleep state monitoring is essential for assessing preterm infant neurodevelopment.
- Developing unobtrusive methods is critical to avoid disrupting infant sleep.
- Further research and validation of non-invasive techniques are recommended for improved neonatal sleep assessment.
Abstract:
Sleep is important for the development of preterm infants. During sleep, neural connections are formed and the development of brain regions is triggered. In general, various rudimentary sleep states can be identified in the preterm infant, namely active sleep (AS), quiet sleep (QS) and intermediate sleep (IS). As the infant develops, sleep states change in length and organization, with these changes as important indicators of brain development. As a result, several methods have been deployed to distinguish between the different preterm infant sleep states, among which polysomnography (PSG) is the most frequently used. However, this method is limited by the use of adhesive electrodes or patches that are attached to the body by numerous cables that can disturb sleep. Given the importance of sleep, this review explores more unobtrusive methods that can identify sleep states without disturbing the infant. To this end, after a brief introduction to preterm sleep states, an analysis of the physiological characteristics associated with the different sleep states is provided and various methods of measuring these physiological characteristics are explored. Finally, the advantages and disadvantages of each of these methods are evaluated and recommendations for neonatal sleep monitoring proposed.
