Fluid structure interaction simulations of the upper airway in obstructive sleep apnea patients before and after maxillomandibular advancement surgery

被引:23
作者
Chang, Kwang K. [1 ]
Kim, Ki Beom [1 ]
McQuilling, Mark W. [2 ]
Movahed, Reza [1 ]
机构
[1] St Louis Univ, Ctr Adv Dent Educ, St Louis, MO 63103 USA
[2] St Louis Univ, Coll Engn Aviat & Technol, St Louis, MO 63103 USA
关键词
MANDIBULAR ADVANCEMENT; NUMERICAL-SIMULATION; SOFT PALATE; FLOW; MANAGEMENT; MOVEMENT;
D O I
10.1016/j.ajodo.2017.08.027
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Introduction: The purpose of this study was to analyze pharyngeal airflow using both computational fluid dynamics (CFD) and fluid structure interactions (FSI) in obstructive sleep apnea patients before and after maxillomandibular advancement (MMA) surgery. The airflow characteristics before and after surgery were compared with both CFD and FSI. In addition, the presurgery and postsurgery deformations of the airway were evaluated using FSI. Methods: Digitized pharyngeal airway models of 2 obstructive sleep apnea patients were generated from cone-beam computed tomography scans before and after MMA surgery. CFD and FSI were used to evaluate the pharyngeal airflow at a maximum inspiration rate of 166 ml per second. Standard steady-state numeric formulations were used for airflow simulations. Results: Airway volume increased, pressure drop decreased, maximum airflow velocity decreased, and airway resistance dropped for both patients after the MMA surgery. These findings occurred in both the CFD and FSI simulations. The FSI simulations showed an area of marked airway deformation in both patients before surgery, but this deformation was negligible after surgery for both patients. Conclusions: Both CFD and FSI simulations produced airflow results that indicated less effort was needed to breathe after MMA surgery. The FSI simulations demonstrated a substantial decrease in airway deformation after surgery. These beneficial changes positively correlated with the large improvements in polysomnography outcomes after MMA surgery.
引用
收藏
页码:895 / 904
页数:10
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