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Sleep-disordered breathing, pharyngeal size and soft tissue anatomy in children

Departments of ¹Physiology, ²Medicine, ³Pediatrics, and ⁴Radiology, and ⁵Arizona Respiratory Center, University of Arizona, Tucson, Arizona 85721

Submitted 20 March 2003 ; accepted in final form 28 July 2003

We tested the hypothesis that pharyngeal geometry and soft tissue dimensions correlate with the severity of sleep-disordered breathing. Magnetic resonance images of the pharynx were obtained in 18 awake children, 7-12 yr of age, with obstructive apnea-hypopnea index (OAHI) values ranging from 1.81 to 24.2 events/h. Subjects were divided into low-OAHI (n = 9) and high-OAHI (n = 9) groups [2.8 ± 0.7 and 13.5 ± 4.9 (SD) P < 0.001]. The OAHI correlated positively with the size of the tonsils (r² = 0.42, P = 0.024) and soft palate (r² = 0.33, P = 0.049) and inversely with the volume of the oropharyx (r² = 0.42, P = 0.038). The narrowest point in the pharyngeal airway was smaller in the high-compared with the low-OAHI group (4.4 ± 1.2 vs. 6.0 ± 1.3 mm; P = 0.024), and this point was in the retropalatal airway in all but two subjects. The airway cross-sectional area (CSA)-airway length relation showed that the high-OAHI group had a narrower retropapatal airway than the low-OAHI group, particularly in the retropalatal region where the soft palate, adenoids, and tonsils overlap (P = 0.001). The "retropalatal air space," which we defined as the ratio of the retropalatal airway CSA to the CSA of the soft palate, correlated inversely with the OAHI (r² = 0.49, P = 0.001). We conclude that 7- to 12-yr-old children with a narrow retropalatal air space have significantly more apneas and hypopneas during sleep compared with children with relatively unobstructed retropalatal airways.

apnea; hypopnea; magnetic resonance imaging; upper airway; obstructive apnea hypopnea index

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