Positional obstructive sleep apnea in pediatric down syndrome: Prevalence and therapy implications

Area of Science:

• Pediatric Sleep Medicine
• Genetics and Rare Diseases
• Respiratory Physiology

Background:

• Children with Down syndrome (DS) possess unique anatomical features predisposing them to positional obstructive sleep apnea (POSA).
• Investigating POSA prevalence and contributing factors in pediatric DS is crucial for understanding sleep-related breathing disorders.

Purpose of the Study:

• To determine the prevalence of POSA in children with DS compared to a control group.
• To identify predisposing factors for POSA in pediatric Down syndrome.

Main Methods:

• Retrospective review of overnight polysomnograms for children with and without DS (November 2016 - December 2023).
• POSA defined as an obstructive apnea-hypopnea index (OAHI) at least twice as high in supine vs. non-supine positions.
• Collection and analysis of demographic and sleep data.

Main Results:

• Children with DS exhibited more severe OSA across various sleep states and positions compared to controls.
• While POSA prevalence was slightly higher in controls (48%) vs. DS (36%), DS children with POSA showed a more even distribution across all OSA severity categories.
• Down syndrome was associated with decreased odds of having POSA (OR 0.45, p=0.042), despite more severe OSA overall.

Conclusions:

• DS subjects present with more severe OSA and a tendency for significant apneic events regardless of body position or sleep stage.
• Hypotonia and increased airway collapsibility are hypothesized as primary drivers of this OSA phenotype in DS.
• Positional therapy requires individualized approaches for children with Down syndrome and OSA.