Fluid-structure interaction modeling of upper airways before and after nasal surgery for obstructive sleep apnea

2012 ◽  
Vol 28 (5) ◽  
pp. 528-546 ◽  
Author(s):  
Ying Wang ◽  
Jie Wang ◽  
Yingxi Liu ◽  
Shen Yu ◽  
Xiuzhen Sun ◽  
...  
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Fluid Structure Interaction ◽  
Nasal Surgery ◽  
Upper Airways ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Obstructive Sleep ◽  
Before And After ◽  
Interaction Modeling

scholarly journals Simulation of the Retroglossal Fluid-Structure Interaction During Obstructive Sleep Apnea

2006 ◽  
pp. 48-57 ◽  
Author(s):  
Franz Chouly ◽  
Annemie Van Hirtum ◽  
Pierre-Yves Lagrée ◽  
Jean-Roch Paoli ◽  
Xavier Pelorson ◽  
...  
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Fluid Structure Interaction ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Obstructive Sleep

Study of the upper airway of obstructive sleep apnea patient using fluid structure interaction

2018 ◽  
Vol 249 ◽  
pp. 54-61 ◽  
Author(s):  
Yang Liu ◽  
Jennifer Mitchell ◽  
Yitung Chen ◽  
Woosoon Yim ◽  
Wenxiao Chu ◽  
...  
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Fluid Structure Interaction ◽  
Upper Airway ◽  
Obstructive Sleep Apnea Patient ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Obstructive Sleep

Predicting the Treatment Response of Oral Appliances for Obstructive Sleep Apnea Using Computational Fluid Dynamics and Fluid-Structure Interaction Simulations

2013 ◽  
Author(s):  
Moyin Zhao ◽  
Tracie Barber ◽  
Peter Cistulli ◽  
Kate Sutherland ◽  
Gary Rosengarten
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Pressure Drop ◽  
Treatment Response ◽  
Fluid Structure Interaction ◽  
Maximum Pressure ◽  
Structure Interaction ◽  
Obstructive Sleep

In this study we used computational fluid dynamics (CFD) to analyze the therapeutic effect of an oral device (mandibular advancement splint – MAS, that protrudes the lower jaw during sleep) as a treatment for Obstructive Sleep Apnea (OSA). Anatomically-accurate upper airway (UA) computational models were reconstructed from magnetic resonance images (MRI) of 7 patients with and without a MAS device fitted. CFD simulations of UA airflow were performed at the maximum flow rate during inspiration. The CFD results indicated the lowest pressure often occurs close to the soft palate and the base of the tongue. The airway pressure gradient was estimated as the best indicator for treatment response since the change in the pressure drop forms a linear correlation with the change in patients’ Apnea-Hypopnea Index (AHI). This correlation has the potential to be developed into a model for predicting the outcome of the MAS treatment. However the rigid wall assumption of CFD models is the major uncertainty. To overcome this uncertainty we set up a full fluid-structure interaction model for a typical responder case with a compliant UA wall. The results demonstrated the different UA flow field associated with using MAS alleviated the airway collapse, which was successfully predicted for the untreated patient. We thus show for the first time that FSI is more accurate than CFD with rigid walls for the study of OSA, and can predict treatment response. Comparison of the FSI and CFD results for the UA flow and pressure profiles showed variation between the models. The structural deflection in oropharynx effectively reformed the flow pattern, however, the maximum pressure drops of both results were close. This supports the competence of the CFD method in clinical applications, where maximum pressure drop data can be used to develop a treatment-predicting model.

scholarly journals Double Barrel Nasal Trumpets to Prevent Upper Airway Obstruction after Nasal and Non-Nasal Surgery

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Macario Camacho ◽  
Justin M. Wei ◽  
Lauren K. Reckley ◽  
Sungjin A. Song
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Airway Obstruction ◽  
Upper Airway ◽  
Upper Airway Obstruction ◽  
Morbidly Obese ◽  
Obese Patients ◽  
Nasal Surgery ◽  
Upper Airways ◽  
Obstructive Sleep

Objectives. During anesthesia emergence, patients are extubated and the upper airway can become vulnerable to obstruction. Nasal trumpets can help prevent obstruction. However, we have found no manuscript describing how to place nasal trumpets after nasal surgery (septoplasties or septorhinoplasties), likely because (1) the lack of space with nasal splints in place and (2) surgeons may fear that removing the trumpets could displace the splints. The objective of this manuscript is to describe how to place nasal trumpets even with nasal splints in place. Materials and Methods. The authors describe techniques (Double Barrel Technique and Modified Double Barrel Technique) that were developed over three years ago and have been used in patients with obstructive sleep apnea (OSA) and other patients who had collapsible or narrow upper airways (i.e., morbidly obese patients). Results. The technique described in the manuscript provides a method for placing one long and one short nasal trumpet in a manner that helps prevent postoperative upper airway obstruction. The modified version describes a method for placing nasal trumpets even when there are nasal splints in place. Over one-hundred patients have had nasal trumpets placed without postoperative oxygen desaturations. Conclusions. The Double Barrel Technique allows for a safe emergence from anesthesia in patients predisposed to upper airway obstruction (such as in obstructive sleep apnea and morbidly obese patients). To our knowledge, the Modified Double Barrel Technique is the first description for the use of nasal trumpets in patients who had nasal surgery and who have nasal splints in place.

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