Abstract: Objective    To compare NPT-PSG with computered tomography (CT) scan which was also used to evaluate the glossopharyngeal obstruction. Methods    Sixty-five patients with OSAHS diagnosed by PSG were enrolled in this study. All the patients were successfully examined by NPT-PSG and CT scan. The correlation analysis between NPT-PSG and glossopharyngeal airway cross area (S) were conducted. And the coincidence of diagnosing glossopharyngeal obstruction of the two methods was calculated. Results    There was no significant correlation between NPT-PSG and glossopharyngeal airway cross area, the correlation coefficient of AHI and LSaO2 with S was 0.02 and 0.085 respectively. There were 7 and 37 patients diagnosed as glossopharyngeal obstruction by CT and NPT-PSG respectively. The concordance of the two methods was poor, assessed by kappa coefficient 0.055， P>0.05. Conclusion     The coincidence between the CT scan and NPT-PSG is poor. Multiple diagnosis tool and aggregate analysis should be used in localization glossopharyngeal obstruction in OSAHS.

Key words: Polysomnography, Sleep apnea hypopnea syndrome, obstructive, Nasopharyngeal tube； Airway obstruction； Glossopharyngeal； X-ray computered tomography