The Application of CT to Localize the Upper Airway Obstruction Plane in Patients with OSAHS

Abstract

The main obstructive plane in patients with OSAHS was the retropalatal region. An awake upper airway CT scan can properly diagnose palatopharyngeal obstruction; however, it is not suitable for detecting retroglossal obstruction.

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

“…Currently, there are many methods for diagnosing glossopharyngeal obstruction. In addition to a series of commonly used tests while the patient is awake [3,8,9], examinations about localizing the site of obstruction during natural or induced sleep are relatively reliable [4,5,10].…”

“…In addition to a series of commonly applied examinations while awake [8,9], examinations performed during natural or induced sleep are relatively accurate [4,5,10]. Nasopharyngeal tube (NPT) insertion can guarantee the responsibility of excluding the obstruction of the nasal cavity, nasopharyngeal and oropharyngeal airways.…”

Efficacy and mechanism of mandibular advancement devices for persistent sleep apnea after surgery: a prospective study

“…Apnea was defined as the total cessation of airflow that was >10 s. Hypopnea was defined as an event that met two of the following three criteria: (1) a decrease in airflow of >50 %; (2) an EEG arousal as defined by the American Sleep Disorders Association scoring criteria; or (3) oxygen desaturation of >3 %. OSAHS was defined as an AHI of more than five episodes per hour during sleep in patients with symptoms of the disorder [9]. Therapeutically effective is defined as a decrease in AHI of >50 % of that before treatment with MAD in place.…”

“…The cross-sectional area, anterior-posterior diameter, and lateral diameter of each plane of the upper airway were manually measured by using electronic calipers by the same technician. The degree of collapse was calculated as follows: (quiet breathing cross-sectional area at the end of deep breathing or sleep apnea) / cross-sectional area during quiet breathing [9]. CT scans were evaluated by the same investigator who was blinded to both responders and non-responders.…”

Lingual-occlusal surface position predicts retroglossal obstruction in patients with obstructive sleep apnea hypopnea syndrome

“…Hence, the clinical application of these methods is limited. Methods, widely used in clinical practice, include routine physical examination, endoscopy, CT, and MRI measurements in the awake state, and so on [4,[8][9][10]. Of the total, Friedman tongue position (FTP) classification is most commonly used because it is easy to apply and can give a comparatively accurate prediction in retroglossal obstruction [4].…”