[The study of the diagnostic value of 64-slice CT in obstructive sleep apnea hypopnea syndrome in Müller maneuver].

Objective: To examine the location, extent and cause of collapsed airway in Müller maneuver in OSAHS patients with CT scan, and provide the evidence for surgery.

Method: Thirty patients with moderate or severe OSAHS were measured with 64 slice CT in quiet breathing and in Müller maneuver. After three-dimensional reconstruction and virtual endoscope handing of the upper airway, we compare the cross-section area and the dimensions of five levels as well as the thickness of retropharyngeal and lateral pharyngeal tissue in two conditions. The evaluation values include the length and thickness of soft palate and uvula, soft-hard palate angle and hyoid hard palate distance.

Result: The lateral distance, anterior - posterior distance, cross - sectional area, but AP of RG and EPG region, were statistically different in quiet breathing and in Müller maneuver. The thickness of retropharyngeal and lateral pharyngeal tissue were statistically different in two conditions, and the length and thickness of soft plate and uvula, soft-hard angle and hyoid hard palate distance were statistically different.

Conclusion: Three-dimensional reconstruction and virtual endoscope of 64 slice CT can clearly show the location, extent and cause of occlusion of the upper airway, which helps well clinical application.