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Updated: Jun 17, 2026

A Preterm Rat Model for Pain Studies
Published on: February 9, 2024
Effects of pain management on sleep in preterm infants
Anna Axelin1, Jarkko Kirjavainen, Sanna Salanterä
1Department of Nursing Science, Finnish Post-Graduate School in Nursing Science, University of Turku, Finland. anna.axelin@utu.fi
Insights
Pain management in preterm infants significantly alters sleep structure, with oxycodone drastically reducing REM sleep. This reduction in rapid eye movement (REM) sleep may impact brain development in vulnerable infants.
Area of Science:
- Neonatal care
- Pediatric sleep medicine
- Pain management
Background:
- Preterm infants experience prolonged pain and require effective pain management.
- Understanding the impact of pain and its management on infant sleep is crucial for development.
Purpose of the Study:
- To investigate the effects of different pain management strategies on the sleep structure of very preterm infants.
- To compare the sleep architecture following painful procedures with and without pain management.
Main Methods:
- A prospective, randomized, placebo-controlled, cross-over trial was conducted.
- Polysomnography was used to record sleep structure in 18 preterm infants (28-32 weeks post-conceptional age).
- Standardized nursing care with interventions (facilitated tucking by parents, oral glucose, oxycodone, or placebo) was administered at 3-hour intervals.
Main Results:
- All interventions reduced rapid eye movement (REM) sleep in the first hour post-intervention.
- Oxycodone significantly decreased REM sleep (48.0%) compared to oral glucose (64.4%), placebo (62.9%), and facilitated tucking by parents (61.6%).
- Sleep onset occurred more frequently as non-rapid eye movement (NREM) sleep after oxycodone (50%) compared to other interventions.
Conclusions:
- Oxycodone administration markedly alters the sleep structure in preterm infants, significantly reducing REM sleep.
- The observed reduction in REM sleep following oxycodone may have implications for brain development in preterm infants.
Background:
This study was conducted to gain better understanding of the prolonged effects of pain and pain management on preterm infants' sleep.
Aim:
The hypothesis was that the sleep structure in very preterm infants is different after painful procedures with pain management (facilitated tucking by parents (FTP), oral glucose, and oxycodone) than without pain management (oral water as placebo).
Methods:
A prospective randomized placebo-controlled cross-over trial design was used. Thirteen-hour polysomnographic recordings were conducted when the study infants (n=18) were at a post-conceptional age of 28-32 weeks. During the recordings, the standardized nursing care periods were carried out with different forms of pain management administered at 3-h intervals. Sleep structure was analyzed before and after the interventions. The main hypothesis was analyzed using mixed models.
Results:
During the first post-intervention hour, the amount of rapid eye movement (REM) sleep decreased after all interventions regardless of pain management (p<0.001). However, the oxycodone treatment further reduced the amount of REM sleep to 48.0% (SD 14.9) compared to other interventions: oral glucose to 64.4% (SD 12.8), (p<0.001); placebo to 62.9% (SD 16.1), (p<0.001); and FTP to 61.6% (SD 1.9), (p=0.004). In addition, sleep onset comprised non-rapid eye movement (NREM) sleep more frequently after oxycodone (50%) compared to placebo (6%, p=0.006), oral glucose (11%, p=0.019) or FTP (17%, p=0.056).
Conclusion:
Pain management with oxycodone markedly altered the structure of the subsequent sleep period. This reduced amount of REM sleep may have consequences for brain development in preterm infants.
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