Diagnosing Lingual Airway Obstruction Using Nasopharyngeal Tube in OSAHS: Natural Sleep vs Induced Sleep

Obstructive sleep apnea hypopnea syndrome (OSAHS) is apnea and hypoventilation caused by upper airway collapse during sleep, accompanied by snoring, disrupted sleep structure, frequent occurrence of oxygen desaturation and daytime sleepiness [1,2]. OSAHS has a rather high prevalence and can cause systemic and multi-system damages. Hence, it has received increasing attention in recent years. The anatomical stenosis or obstruction of the upper respiratory tract is one of the main reasons for the pathogenesis of OSAHS [3,4], and accurate determination of the location and extent of upper airway obstruction is the key for choosing the proper surgical approach and improving the therapeutic effect [5-7].