Upper airway obstruction during sleep in infants with laryngomalacia is frequently sleep-position-dependent.

BACKGROUND

Laryngomalacia is the most common congenital airway anomaly causing breathing difficulties in infants. Severe laryngomalacia is often associated with obstructive sleep apnea (OSA).

METHODS

We re-evaluated 14-year pediatric sleep center polysomnography (PSG) data in infants with fluoroscopy-verified laryngomalacia.

RESULTS

The study included 79 infants, with a median corrected age of 8 weeks (interquartile range, IQR 5-13) and a laryngomalacia clinical score of 10/14 (IQR 7-11). Most (78%) PSG studies were daytime studies. In PSG, laryngomalacia-related breathing difficulty appeared as a sleep stage and position-dependent OSA with laborious breathing. PSG allowed position comparison in 69 infants. In the supine sleeping position, a median obstructive apnea and hypopnea-index (OAHI) was 22 h-1 (IQR 10-50) compared with 7 h-1 (IQR 1-26) in the side sleeping position (p < 0.0001). In the supine, breathing was also more laborious, and end-tidal carbon dioxide 99th percentile levels were higher than in the side sleeping position (p < 0.0001). The degree of OSA (OAHI) showed only a weak correlation with the laryngoscopy severity score (R2 0.10, p = 0.005).

CONCLUSIONS

In infant laryngomalacia, the degree of upper airway obstruction is frequently more severe in the supine than in the side sleeping position. However, some variability remains in the response.

IMPACT: Laryngomalacia is the most common congenital airway anomaly causing breathing difficulties in infants. Obstructive breathing events and obstructive sleep apnea are common in severe laryngomalacia even though the stridor often diminishes or resolves during sleep. We observed that in young infants with laryngomalacia, the appearance of upper airway obstruction is both sleep position and sleep-stage dependent. Compared to the supine sleeping position, the side sleeping position reduced the frequency of obstructive events and breathing effort, and lowered end-tidal carbon dioxide 99th percentile levels.