A videoendoscopic evaluation of the upper airway in South East Asian adults with obstructive sleep apnea.
OBJECTIVE
We aimed to evaluate the severity of upper airway obstruction at the retropalatal and retroglossal regions in obstructive sleep apnea (OSA) patients.


METHODS
This is a descriptive cross-sectional study at the Sleep Clinic, Department of Otorhinolaryngology-Head and Neck Surgery. Flexible nasopharyngolaryngoscopy was performed in seated erect and supine position. Retropalatal and retroglossal regions were continuously recorded during quiet breathing and Mueller's maneuver in both positions. Captured images were measured using Scion Image software and narrowing rate was calculated. Level of each site was classified based on Fujita classification and severity of obstruction using Sher scoring system for Mueller's maneuver.


RESULTS
A total of 59 patients participated in this study. Twenty-nine (49.2%) participants had type 1 (retropalatal) obstruction, 23 (38.9%) had type 2 (retropalatal and retroglossal), and seven (11.9%) in type 3 (retroglossal) obstruction. Fifty (84.7%) of the patients have severe obstruction at the retropalatal region in supine position (SRP) followed by 35 (59.3%) at retropalatal region in erect position (ERP), 27 (45.8%) at retroglossal region in supine position (SRG) and eight (13.5%) at retroglossal region in erect position (ERG). The average oxygen saturation showed significant association in ERP (P = 0.012) and SRP (P < 0.001), but not significant in ERG and SRG.


CONCLUSIONS
Videoendoscopy utilizing flexible nasopharyngolaryngoscopy and Scion Image software is reliable, minimally invasive, and useful as an office procedure in evaluating the multilevel obstruction of upper airway in OSA patients. The retropalatal region has more severe obstruction compared with retroglossal region either in erect or supine position.
Abdullah
Baharudin
B
Department of Otorhinolaryngology-Head and Neck Surgery, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia. baharudin@kb.usm.my
Rajet
Khairul Azhar M
KA
Abd Hamid
Suzina Sheikh
SS
Mohammad
Wan Mohd Zahiruddin Wan
WM
D000328:Adult; D000402:Airway Obstruction / Q000175:diagnosis* / Q000208:ethnology* / Q000503:physiopathology; D019723:Endoscopes; D004867:Equipment Design; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation; D008296:Malaysia; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D012016:Reference Values; D020181:Sleep Apnea, Obstructive / Q000145:classification / Q000175:diagnosis* / Q000208:ethnology* / Q000503:physiopathology; D014741:Video Recording / Q000295:instrumentation*; D055815:Young Adult
D010100:Oxygen