Difference in upper airway between OSAS patients and normal population with dynamic radiography / 实用放射学杂志

ABSTRACT

Objective To analyze the difference in changes of upper airway between obstructive sleep apnea syndrome (OSAS) patients and normal population using dynamic radiography under sleeping and awake conditions.Methods 20 normal subjects and 20 OSAS patients underwent the dynamic digital radiography of the upper airway under sleeping and awake conditions.And the dynamic diameter changes of the upper airway at velopharyngeal,oropharynx and hypopharynx levels were measured and recorded.Results The velo-pharyngeal upper airway collapse in normal subjects under sleeping condition was significantly larger than that under awake condition (P <0.014).However no significant differences in the collapse of upper airway at oropharynx and hypopharynx level were observed between sleeping and awake conditions.For the OSAS patients,the upper airway collapses at velopharyngeal,oropharynx and hypopharynx levels under sleeping condition were significantly larger than those under awake condition respectively (P <0.000,P =0.001,P <0.013). During awake state,there were no significant differences in upper airway collapse at velopharyngeal,oropharynx and hypopharynx levels between normal subjects and OSAS patients under awake condition.During sleeping state,the upper airway collapses of OSAS patients were significantly larger than that of normal subjects at velopharyngeal and oropharyngeal levels (P =0.000,P =0.003). However,no significant difference was observed at hypopharynx level.Conclusion The normal upper airway represents obvious col-lapse at velopharyngeal level under sleeping condition.However,the upper airway in OSAS patients at velopharyngeal,oropharynx and hypopharynx level showed significant collapse under sleeping condition compared with that under awake condition.The upper airway of the OSAS patients represents obvious collapse at velopharyngeal and oropharyngeal level under sleeping condition,however no abnormal changes can be observed under awake condition.