• Chul Hee Lee, Sang-Wook Kim, Kyuhee Han, Jae-Min Shin, Sung-Lyong Hong, Ji-Eun Lee, Chae-Seo Rhee, and Jeong-Whun Kim.
• Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 300 Goomi-dong, Bundang-gu, Seongnam, Gyunggi-do 463-707, South Korea.
• Arch. Otolaryngol. Head Neck Surg. 2011 Jul 1; 137 (7): 675-9.

ObjectiveTo assess the effect of uvulopalatopharyngoplasty (UPPP) on positional dependency in patients with obstructive sleep apnea (OSA).DesignRetrospective analysis.SettingTertiary care university hospital.PatientsNinety-six patients who underwent UPPP because of OSA from June 1, 2004, through July 31, 2008, were included. Both preoperative and postoperative attended full-night polysomnography were conducted in all patients. Positional dependency was diagnosed if the patient's apnea-hypopnea index score in the supine position was more than twice as high as that in the lateral position.Main Outcome MeasuresPosition-specific outcomes of UPPP, such as the success rates in the supine or lateral position, were assessed, as well as overall treatment outcomes. The outcomes were also analyzed according to the severity level of the apnea-hypopnea index in each position. The change of positional dependency after UPPP was evaluated.ResultsThe apnea-hypopnea index score in the lateral position was markedly reduced after UPPP in position-independent patients (P = .02). However, the overall success rates were only 31.8% and 34.6% in patients with and without positional dependency, respectively. The success rate in the lateral position was 68.2% in position-independent patients and 32.7% in position-dependent patients (P = .01). In addition, 14 of 22 patients with position-independent OSA (64%) gained positional dependency after UPPP.ConclusionsUvulopalatopharyngoplasty is successful treatment for obstructive events occurring in the lateral sleep position, especially in patients without positional dependency. This implies that patients who have become position dependent may benefit from positional therapy after UPPP.

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