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Published on: December 6, 2016
Sleep spindle activity in children with obstructive sleep apnea as a marker of neurocognitive performance: A pilot
Pablo E Brockmann1, Felipe Damiani2, Eduardo Pincheira3
1Department of Pediatric Cardiology and Pulmonology, Division of Pediatrics, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile; Sleep Medicine Center, Department of Neurology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
Insights
Children with mild obstructive sleep apnea (OSA) show altered sleep spindle activity, impacting neurocognitive functions, particularly memory. This suggests sleep spindles are key indicators of cognitive outcomes in pediatric OSA.
Area of Science:
- Neuroscience
- Pediatric Sleep Medicine
- Cognitive Psychology
Background:
- Obstructive sleep apnea (OSA) in children can lead to neurocognitive deficits.
- Sleep microstructure, including sleep spindles, may be affected by OSA.
- Identifying biomarkers for neurocognitive consequences in pediatric OSA is crucial.
Purpose of the Study:
- To investigate sleep spindle activity as potential markers for neurocognitive outcomes in children with mild OSA.
- To compare sleep spindle patterns between children with mild OSA and healthy controls.
- To examine the correlation between sleep spindle activity and neurocognitive performance.
Main Methods:
- Recruited children aged 6-11 years with mild OSA (apnea-hypopnea index <5.0) and age/gender-matched controls.
- Conducted polysomnography to analyze sleep microstructure and spindle activity.
- Administered the Wechsler intelligence test for children (4th ed.) to assess neurocognitive function.
Main Results:
- Children with mild OSA exhibited significantly lower spindle index in N2 stage compared to controls (89.5 ± 56.9 vs 143.0 ± 42.5, p=0.003).
- No significant difference in overall IQ scores was observed between groups (OSA: 111 ± 13 vs Controls: 108 ± 12, p=0.602).
- Spindle index in non-rapid eye movement (NREM) sleep strongly correlated with Verbal Comprehension Index, Working Memory Index, Processing Speed Index, and total IQ in children with OSA.
Conclusions:
- Mild OSA in children is associated with distinct sleep spindle activity patterns.
- Sleep spindle activity appears linked to neurocognitive performance, especially memory, in pediatric OSA.
- Sleep spindles may play a role in the mechanisms underlying neurocognitive consequences of OSA in children.
Study Objectives:
To assess spindle activity as possible markers for neurocognitive consequences in children with mild obstructive sleep apnea.
Methods:
Children aged 6-11 years diagnosed with mild OSA (i.e., an apnea hypopnea index <5.0) were recruited and compared with age and gender-matched healthy controls. Polysomnographic recordings were analyzed for sleep microstructure and spindle activity. All children completed also an intelligence test battery (i.e., the Wechsler intelligence test for children, 4th version).
Results:
Nineteen children with OSA (13 boys, mean age 7.1 ± 1.4 y), and 14 controls (7 boys, mean age 8.1 ± 1.9 y) were included. Mean IQ was 110 ± 12 for the complete sample, in children with OSA 111 ± 13, and in controls 108 ± 12 (p = 0.602). Controls showed a higher spindle index in N2 stage than children with OSA: 143.0 ± 42.5 vs 89.5 ± 56.9, respectively (p = 0.003). Spindle index in NREM was strongly and significantly correlated with Verbal Comprehension Index (VCI), Working Memory Index (WMI), Processing Speed Index (PSI), and total IQ in children with OSA.
Conclusions:
Children with mild OSA demonstrate a different pattern of sleep spindle activity that seems to be linked with neurocognitive performance, especially concerning memory. Sleep spindle activity seems to be involved with mechanisms related with neurocognitive consequences in children with OSA.
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