What are the anatomic considerations for surgical treatment of obstructive sleep apnea (OSA)?

Updated: Sep 15, 2020
  • Author: Himanshu Wickramasinghe, MD, MBBS; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Functional division of the pharynx into the retropalatal-oropharyngeal region (posterior to the soft palate) and the retrolingual-hypopharyngeal region (posterior to the vertical portion of the tongue) has been proposed. Obstruction in patients with SDB is classified into 3 types according to region. Type I is obstruction in only the retropalatal region. Type II is obstruction in both the retropalatal and retrolingual regions. Type III is obstruction in only the retrolingual region.

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