Patterns of Pharyngeal Obstruction and Collapse in Obese and Nonobese Children on Drug-Induced Sleep Endoscopy

Objective(1) Compare proportions of collapse, obstruction, or mixed instances on drug-induced sleep endoscopy findings of obese and nonobese children with obstructive sleep disordered breathing. (2) Determine the frequency of collapse in general between both groups. Study DesignRetrospective case-control study. SettingTertiary pediatric center. MethodsObese (body mass index >95 percentile) children presenting with obstructive sleep disordered breathing (>33 on the pediatric sleep questionnaire) were identified from a prospectively kept surgical database. Only those who had undergone drug-induced sleep endoscopy were eligible. Age and sex pair-matched nonobese children were identified. Only nonsyndromic, neurologically normal, surgically naive patients were included. The frequency of obstructive, collapse, and mixed pharyngeal patterns was documented in both groups. A comparison of proportions was then undertaken (chi(2) test). ResultsOver a 5-year period, 73 consecutive children with obesity were identified (40 males; mean of 8.5 +/- 3.0 years, 2.8-13.1). They were matched with 73 nonobese children (8.4 +/- 3.0 years, 2.6-14.1). The obese group exhibited significantly more pharyngeal collapses (62:47) (p = .0021 odds ratio [OR] 3.358, 95% confidence interval [CI] 1.52-7.42). The proportion of pharyngeal findings on drug-induced sleep endoscopy was significantly different (p = .000129) between the 2 groups; obese (61 mixed: 3 obstruction: 9 collapse) and nonobese (48 mixed: 22 obstruction: 4 collapse). ConclusionThe predominance of hypopharyngeal collapse in children with obesity may explain the likelihood of failure of surgery directed at obstructive findings. This may also strengthen the case for drug-induced sleep endoscopy in this group at the initial surgery to guide it rather than after the failure of adenotonsillectomy.