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Updated: Mar 17, 2026

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Published on: December 6, 2016
Modified Friedman stage in predicting glossopharyngeal obstruction in obstructive sleep apnea
Dahai Wu1,2, Jie Qin2, Xiaohong Guo2
1a Department of Otolaryngology, Head and Neck Surgery , PLA General Hospital , Beijing , PR China.
Conclusions:
Modified Friedman stage can be used to predict glossopharyngeal obstruction better than before in patients with obstructive sleep apnea (OSA).
Objective:
To evaluate the diagnostic value of modified Friedman stage in predicting glossopharyngeal obstruction in patients with OSA.
Methods:
Eighty-five OSA patients with Friedman stage III were divided into IIIa group and IIIb group based on an imaginary line drawn in the horizontal and middle position of the soft palate. Polysomnography (PSG) was performed after nasopharyngeal tube (NPT) insertion (NPT-PSG) to diagnose glossopharyngeal obstruction. Apnea-hypopnea index (AHI) determined by NPT-PSG (NPT-AHI) and glossopharyngeal obstruction result determined by NPT-PSG (NPT-PSG result) were compared between the two groups.
Results:
There were significant differences in NPT-AHI (p < 0.01) and NPT-PSG result (p < 0.01) between the two groups.
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