The Experts below are selected from a list of 22599 Experts worldwide ranked by ideXlab platform
De Yun Wang - One of the best experts on this subject based on the ideXlab platform.
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aerodynamic effects of inferior Turbinate surgery on nasal airflow a computational fluid dynamics model
Rhinology, 2010Co-Authors: Xiao Bing Chen, H P Lee, Vincent F H Chong, S C Leong, De Yun WangAbstract:Background: Turbinate reduction surgery may be indicated for inferior Turbinate enlargement when conservative treatment fails. The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal aerodynamics using computational fluid dynamics (CFD) simulations. Methods: CFD simulations were performed for the normal nose, enlarged inferior Turbinate and following three surgical procedures: 1) resection of the lower third free edge of the inferior Turbinate, 2) excision of the head of the inferior Turbinate and 3) radical inferior Turbinate resection. The models were constructed from MRI scans of a healthy human subject and a turbulent flow model was used for the numerical simulation. The consequences of the three Turbinate surgeries were compared with an originally healthy nasal model as well as one with severe nasal obstruction. Results: In the normal nose, the bulk of streamlines traversed the common meatus adjacent to the inferior and middle Turbinate in a relatively vortex free flow. When the inferior Turbinate was enlarged, the streamlines were directed superiorly at higher velocity and increased wall shear stress in the nasopharynx. Of the three surgical techniques simulated, wall shear stress and intranasal pressures achieved near-normal levels after resection of the lower third. In addition, airflow streamlines and turbulence improved although it did not return to normal conditions. Radical Turbinate resection resulted in intra-nasal aerodynamics of atrophic rhinitis. Conclusion: There is little evidence that inspired air is appropriately conditioned following radical Turbinate surgery. Partial reduction of the hypertrophic Turbinate results in improved nasal aerodynamics, which was most evident following resection of the lower third. The results were based on a single individual and cannot be generalised without similar studies in other subjects.
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aerodynamic effects of inferior Turbinate surgery on nasal airflow a computational fluid dynamics model
Rhinology, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, Samuel C Leong, De Yun WangAbstract:BACKGROUND: Turbinate reduction surgery may be indicated for inferior Turbinate enlargement when conservative treatment fails. The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal aerodynamics using computational fluid dynamics (CFD) simulations. METHODS: CFD simulations were performed for the normal nose, enlarged inferior Turbinate and following three surgical procedures: (1) resection of the lower third free edge of the inferior Turbinate, (2) excision of the head of the inferior Turbinate and (3) radical inferior Turbinate resection. The models were constructed from MRI scans of a healthy human subject and a turbulent flow model was used for the numerical simulation. The consequences of the three Turbinate surgeries were compared with originally healthy nasal model as well as the one with severe nasal obstruction. RESULTS: In the normal nose, the bulk of streamlines traversed the common meatus adjacent to the inferior and middle Turbinate in a relatively vortex free flow. When the inferior Turbinate was enlarged, the streamlines were directed superiorly at higher velocity and increased wall shear stress in the nasopharynx. Of the three surgical techniques simulated, wall shear stress and intranasal pressures achieved near-normal levels after resection of the lower third. In addition, airflow streamlines and turbulence improved although it did not return to normal conditions. As expected, radical Turbinate resection resulted in intra-nasal aerodynamics of atrophic rhinitis demonstrated in previous CFD studies. CONCLUSION: There is little evidence that inspired air is appropriately conditioned following radical Turbinate surgery. Partial reduction of the hypertropic Turbinate results in improved nasal aerodynamics, which was most evident following resection of the lower third. The results were based on a single individual and cannot be generalised without similar studies in other subjects.
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numerical simulation of the effects of inferior Turbinate surgery on nasal airway heating capacity
American Journal of Rhinology & Allergy, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:BACKGROUND: The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal airway heating capacity using computational fluid dynamics (CFD) simulations. METHODS: Heat transfer simulations were performed for a normal nasal cavity and others with severely enlarged inferior Turbinates, before and after three simulated surgical procedures: (1) resection of the lower third free edge of the inferior Turbinate, (2) excision of the head of the inferior Turbinate, and (3) radical inferior Turbinate resection. The models were run with three different environmental temperatures. RESULTS: The changes of airflow pattern with the reduction of inferior Turbinate affected heat transfer greatly. However, the distribution of wall heat flux showed that the main location for heat exchange was still the anterior region. Under the cold environment, the nasal cavities with the head of inferior Turbinate reduction were capable of heating the inspired air to 98.40% of that of the healthy one; however, for the case with lower third of inferior Turbinate excised, the temperature was 11.65% lower and for the case with radical inferior Turbinate resection, 18.27% lower temperature compared with the healthy nasal cavity. CONCLUSION: The healthy nasal cavity is able to warm up or cool down the inspiratory airflow under different environmental temperature conditions; for the nasal cavities with Turbinate surgeries, partial inferior Turbinate reduction can still sustain such heating capacity. However, too much or total Turbinate resection may impair the normal function of temperature adjustment by nasal mucosa.
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impact of inferior Turbinate hypertrophy on the aerodynamic pattern and physiological functions of the turbulent airflow a cfd simulation model
Rhinology, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:INTRODUCTION: The aim of this study was to investigate the effects of nasal obstruction with enlargement of inferior Turbinates on the aerodynamic flow pattern using Computational Fluid Dynamics (CFD) tools including the effects of turbulence. METHODS: A high-resolution 3-dimensional model of the nasal cavity was constructed from MRI scans of a healthy human subject using MIMICS 12.0 software. Nasal cavities corresponding to healthy, moderate and severe nasal obstructions were simulated by enlarging the inferior Turbinate geometrically. Numerical simulations with turbulent flow models were implemented using FLUENTS for CFD simulations. RESULTS: In the healthy nose, the main respiratory air stream occurs mainly in the middle of the airway, accompanied by a diffused pattern of turbulent flow on the surface of the nasal mucosa. The peak value of turbulent flow is found in the functional nasal valve region. However, this aerodynamic flow pattern has partially or completely changed in the models with enlarged inferior Turbinate. An inhalation flow rate of 34.8 L/min with a maximum velocity of 5.69 m/s, 7.39 m/s and 11.01 m/s are detected, respectively, in the healthy, moderately and severely obstructed noses. Both total negative pressure and maximum shear stress have increased by more than three and two times, respectively, in severely blocked noses compared to the healthy one. CONCLUSION: Data of this study provide quantitative and quantitative information of the impact of inferior Turbinate hypertrophy on the aerodynamic pattern and physiological functions of nasal airflow. By including the model of turbulent airflow, the results of this experimental study will be more meaningful and useful in predicting the aerodynamic effects of surgical correction of inferior Turbinate hypertrophy.
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Numerical simulation for nasal flow with partial inferior turbinatomy-a turbulent model
2009 International Conference on Biomedical and Pharmaceutical Engineering, 2009Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:Partial Inferior turbinectomy is typically performed for patients suffering from chronic nasal obstruction due to hypertrophy of inferior Turbinates and are refractory to other more conservative treatments In this paper, the effects of the various manner of incision performed on the inferior Turbinates in terms of the resulting nasal air flow pattern were analyzed using computational fluid dynamics (CFD). The three 3D nasal models with partial inferior turbinectomy were reconstructed from the MRI scans of a healthy human subject by simulating the three remaining shapes of inferior Turbinate after the respective Turbinate surgery with the use of the software MIMICS 12.1. Thereafter high resolution 3D volume meshes comprising boundary layer effects and computational domain exterior to the nose were constructed. Numerical simulations were carried out using FLUENTS for CFD simulations. The Reynolds averaged Navier-Stokes equations were solved for the turbulence flow with SST k - ¿ model. The consequences of the various types of Turbinate surgery were compared with the originally healthy nasal model as well as the nasal model with severe nasal obstruction. The velocity streamlines, the total pressure drop through the nasal cavity, and the local wall shear stress distribution were presented. The existence of small vortices, relatively larger local velocity and wall shear stress showed that Turbinate surgery should be carefully planned as it may affect normal local nasal functions.
Xiao Bing Chen - One of the best experts on this subject based on the ideXlab platform.
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aerodynamic effects of inferior Turbinate surgery on nasal airflow a computational fluid dynamics model
Rhinology, 2010Co-Authors: Xiao Bing Chen, H P Lee, Vincent F H Chong, S C Leong, De Yun WangAbstract:Background: Turbinate reduction surgery may be indicated for inferior Turbinate enlargement when conservative treatment fails. The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal aerodynamics using computational fluid dynamics (CFD) simulations. Methods: CFD simulations were performed for the normal nose, enlarged inferior Turbinate and following three surgical procedures: 1) resection of the lower third free edge of the inferior Turbinate, 2) excision of the head of the inferior Turbinate and 3) radical inferior Turbinate resection. The models were constructed from MRI scans of a healthy human subject and a turbulent flow model was used for the numerical simulation. The consequences of the three Turbinate surgeries were compared with an originally healthy nasal model as well as one with severe nasal obstruction. Results: In the normal nose, the bulk of streamlines traversed the common meatus adjacent to the inferior and middle Turbinate in a relatively vortex free flow. When the inferior Turbinate was enlarged, the streamlines were directed superiorly at higher velocity and increased wall shear stress in the nasopharynx. Of the three surgical techniques simulated, wall shear stress and intranasal pressures achieved near-normal levels after resection of the lower third. In addition, airflow streamlines and turbulence improved although it did not return to normal conditions. Radical Turbinate resection resulted in intra-nasal aerodynamics of atrophic rhinitis. Conclusion: There is little evidence that inspired air is appropriately conditioned following radical Turbinate surgery. Partial reduction of the hypertrophic Turbinate results in improved nasal aerodynamics, which was most evident following resection of the lower third. The results were based on a single individual and cannot be generalised without similar studies in other subjects.
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aerodynamic effects of inferior Turbinate surgery on nasal airflow a computational fluid dynamics model
Rhinology, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, Samuel C Leong, De Yun WangAbstract:BACKGROUND: Turbinate reduction surgery may be indicated for inferior Turbinate enlargement when conservative treatment fails. The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal aerodynamics using computational fluid dynamics (CFD) simulations. METHODS: CFD simulations were performed for the normal nose, enlarged inferior Turbinate and following three surgical procedures: (1) resection of the lower third free edge of the inferior Turbinate, (2) excision of the head of the inferior Turbinate and (3) radical inferior Turbinate resection. The models were constructed from MRI scans of a healthy human subject and a turbulent flow model was used for the numerical simulation. The consequences of the three Turbinate surgeries were compared with originally healthy nasal model as well as the one with severe nasal obstruction. RESULTS: In the normal nose, the bulk of streamlines traversed the common meatus adjacent to the inferior and middle Turbinate in a relatively vortex free flow. When the inferior Turbinate was enlarged, the streamlines were directed superiorly at higher velocity and increased wall shear stress in the nasopharynx. Of the three surgical techniques simulated, wall shear stress and intranasal pressures achieved near-normal levels after resection of the lower third. In addition, airflow streamlines and turbulence improved although it did not return to normal conditions. As expected, radical Turbinate resection resulted in intra-nasal aerodynamics of atrophic rhinitis demonstrated in previous CFD studies. CONCLUSION: There is little evidence that inspired air is appropriately conditioned following radical Turbinate surgery. Partial reduction of the hypertropic Turbinate results in improved nasal aerodynamics, which was most evident following resection of the lower third. The results were based on a single individual and cannot be generalised without similar studies in other subjects.
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numerical simulation of the effects of inferior Turbinate surgery on nasal airway heating capacity
American Journal of Rhinology & Allergy, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:BACKGROUND: The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal airway heating capacity using computational fluid dynamics (CFD) simulations. METHODS: Heat transfer simulations were performed for a normal nasal cavity and others with severely enlarged inferior Turbinates, before and after three simulated surgical procedures: (1) resection of the lower third free edge of the inferior Turbinate, (2) excision of the head of the inferior Turbinate, and (3) radical inferior Turbinate resection. The models were run with three different environmental temperatures. RESULTS: The changes of airflow pattern with the reduction of inferior Turbinate affected heat transfer greatly. However, the distribution of wall heat flux showed that the main location for heat exchange was still the anterior region. Under the cold environment, the nasal cavities with the head of inferior Turbinate reduction were capable of heating the inspired air to 98.40% of that of the healthy one; however, for the case with lower third of inferior Turbinate excised, the temperature was 11.65% lower and for the case with radical inferior Turbinate resection, 18.27% lower temperature compared with the healthy nasal cavity. CONCLUSION: The healthy nasal cavity is able to warm up or cool down the inspiratory airflow under different environmental temperature conditions; for the nasal cavities with Turbinate surgeries, partial inferior Turbinate reduction can still sustain such heating capacity. However, too much or total Turbinate resection may impair the normal function of temperature adjustment by nasal mucosa.
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impact of inferior Turbinate hypertrophy on the aerodynamic pattern and physiological functions of the turbulent airflow a cfd simulation model
Rhinology, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:INTRODUCTION: The aim of this study was to investigate the effects of nasal obstruction with enlargement of inferior Turbinates on the aerodynamic flow pattern using Computational Fluid Dynamics (CFD) tools including the effects of turbulence. METHODS: A high-resolution 3-dimensional model of the nasal cavity was constructed from MRI scans of a healthy human subject using MIMICS 12.0 software. Nasal cavities corresponding to healthy, moderate and severe nasal obstructions were simulated by enlarging the inferior Turbinate geometrically. Numerical simulations with turbulent flow models were implemented using FLUENTS for CFD simulations. RESULTS: In the healthy nose, the main respiratory air stream occurs mainly in the middle of the airway, accompanied by a diffused pattern of turbulent flow on the surface of the nasal mucosa. The peak value of turbulent flow is found in the functional nasal valve region. However, this aerodynamic flow pattern has partially or completely changed in the models with enlarged inferior Turbinate. An inhalation flow rate of 34.8 L/min with a maximum velocity of 5.69 m/s, 7.39 m/s and 11.01 m/s are detected, respectively, in the healthy, moderately and severely obstructed noses. Both total negative pressure and maximum shear stress have increased by more than three and two times, respectively, in severely blocked noses compared to the healthy one. CONCLUSION: Data of this study provide quantitative and quantitative information of the impact of inferior Turbinate hypertrophy on the aerodynamic pattern and physiological functions of nasal airflow. By including the model of turbulent airflow, the results of this experimental study will be more meaningful and useful in predicting the aerodynamic effects of surgical correction of inferior Turbinate hypertrophy.
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Numerical simulation for nasal flow with partial inferior turbinatomy-a turbulent model
2009 International Conference on Biomedical and Pharmaceutical Engineering, 2009Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:Partial Inferior turbinectomy is typically performed for patients suffering from chronic nasal obstruction due to hypertrophy of inferior Turbinates and are refractory to other more conservative treatments In this paper, the effects of the various manner of incision performed on the inferior Turbinates in terms of the resulting nasal air flow pattern were analyzed using computational fluid dynamics (CFD). The three 3D nasal models with partial inferior turbinectomy were reconstructed from the MRI scans of a healthy human subject by simulating the three remaining shapes of inferior Turbinate after the respective Turbinate surgery with the use of the software MIMICS 12.1. Thereafter high resolution 3D volume meshes comprising boundary layer effects and computational domain exterior to the nose were constructed. Numerical simulations were carried out using FLUENTS for CFD simulations. The Reynolds averaged Navier-Stokes equations were solved for the turbulence flow with SST k - ¿ model. The consequences of the various types of Turbinate surgery were compared with the originally healthy nasal model as well as the nasal model with severe nasal obstruction. The velocity streamlines, the total pressure drop through the nasal cavity, and the local wall shear stress distribution were presented. The existence of small vortices, relatively larger local velocity and wall shear stress showed that Turbinate surgery should be carefully planned as it may affect normal local nasal functions.
Vincent F H Chong - One of the best experts on this subject based on the ideXlab platform.
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aerodynamic effects of inferior Turbinate surgery on nasal airflow a computational fluid dynamics model
Rhinology, 2010Co-Authors: Xiao Bing Chen, H P Lee, Vincent F H Chong, S C Leong, De Yun WangAbstract:Background: Turbinate reduction surgery may be indicated for inferior Turbinate enlargement when conservative treatment fails. The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal aerodynamics using computational fluid dynamics (CFD) simulations. Methods: CFD simulations were performed for the normal nose, enlarged inferior Turbinate and following three surgical procedures: 1) resection of the lower third free edge of the inferior Turbinate, 2) excision of the head of the inferior Turbinate and 3) radical inferior Turbinate resection. The models were constructed from MRI scans of a healthy human subject and a turbulent flow model was used for the numerical simulation. The consequences of the three Turbinate surgeries were compared with an originally healthy nasal model as well as one with severe nasal obstruction. Results: In the normal nose, the bulk of streamlines traversed the common meatus adjacent to the inferior and middle Turbinate in a relatively vortex free flow. When the inferior Turbinate was enlarged, the streamlines were directed superiorly at higher velocity and increased wall shear stress in the nasopharynx. Of the three surgical techniques simulated, wall shear stress and intranasal pressures achieved near-normal levels after resection of the lower third. In addition, airflow streamlines and turbulence improved although it did not return to normal conditions. Radical Turbinate resection resulted in intra-nasal aerodynamics of atrophic rhinitis. Conclusion: There is little evidence that inspired air is appropriately conditioned following radical Turbinate surgery. Partial reduction of the hypertrophic Turbinate results in improved nasal aerodynamics, which was most evident following resection of the lower third. The results were based on a single individual and cannot be generalised without similar studies in other subjects.
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aerodynamic effects of inferior Turbinate surgery on nasal airflow a computational fluid dynamics model
Rhinology, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, Samuel C Leong, De Yun WangAbstract:BACKGROUND: Turbinate reduction surgery may be indicated for inferior Turbinate enlargement when conservative treatment fails. The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal aerodynamics using computational fluid dynamics (CFD) simulations. METHODS: CFD simulations were performed for the normal nose, enlarged inferior Turbinate and following three surgical procedures: (1) resection of the lower third free edge of the inferior Turbinate, (2) excision of the head of the inferior Turbinate and (3) radical inferior Turbinate resection. The models were constructed from MRI scans of a healthy human subject and a turbulent flow model was used for the numerical simulation. The consequences of the three Turbinate surgeries were compared with originally healthy nasal model as well as the one with severe nasal obstruction. RESULTS: In the normal nose, the bulk of streamlines traversed the common meatus adjacent to the inferior and middle Turbinate in a relatively vortex free flow. When the inferior Turbinate was enlarged, the streamlines were directed superiorly at higher velocity and increased wall shear stress in the nasopharynx. Of the three surgical techniques simulated, wall shear stress and intranasal pressures achieved near-normal levels after resection of the lower third. In addition, airflow streamlines and turbulence improved although it did not return to normal conditions. As expected, radical Turbinate resection resulted in intra-nasal aerodynamics of atrophic rhinitis demonstrated in previous CFD studies. CONCLUSION: There is little evidence that inspired air is appropriately conditioned following radical Turbinate surgery. Partial reduction of the hypertropic Turbinate results in improved nasal aerodynamics, which was most evident following resection of the lower third. The results were based on a single individual and cannot be generalised without similar studies in other subjects.
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numerical simulation of the effects of inferior Turbinate surgery on nasal airway heating capacity
American Journal of Rhinology & Allergy, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:BACKGROUND: The aim of this study was to evaluate the effects of inferior Turbinate surgery on nasal airway heating capacity using computational fluid dynamics (CFD) simulations. METHODS: Heat transfer simulations were performed for a normal nasal cavity and others with severely enlarged inferior Turbinates, before and after three simulated surgical procedures: (1) resection of the lower third free edge of the inferior Turbinate, (2) excision of the head of the inferior Turbinate, and (3) radical inferior Turbinate resection. The models were run with three different environmental temperatures. RESULTS: The changes of airflow pattern with the reduction of inferior Turbinate affected heat transfer greatly. However, the distribution of wall heat flux showed that the main location for heat exchange was still the anterior region. Under the cold environment, the nasal cavities with the head of inferior Turbinate reduction were capable of heating the inspired air to 98.40% of that of the healthy one; however, for the case with lower third of inferior Turbinate excised, the temperature was 11.65% lower and for the case with radical inferior Turbinate resection, 18.27% lower temperature compared with the healthy nasal cavity. CONCLUSION: The healthy nasal cavity is able to warm up or cool down the inspiratory airflow under different environmental temperature conditions; for the nasal cavities with Turbinate surgeries, partial inferior Turbinate reduction can still sustain such heating capacity. However, too much or total Turbinate resection may impair the normal function of temperature adjustment by nasal mucosa.
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impact of inferior Turbinate hypertrophy on the aerodynamic pattern and physiological functions of the turbulent airflow a cfd simulation model
Rhinology, 2010Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:INTRODUCTION: The aim of this study was to investigate the effects of nasal obstruction with enlargement of inferior Turbinates on the aerodynamic flow pattern using Computational Fluid Dynamics (CFD) tools including the effects of turbulence. METHODS: A high-resolution 3-dimensional model of the nasal cavity was constructed from MRI scans of a healthy human subject using MIMICS 12.0 software. Nasal cavities corresponding to healthy, moderate and severe nasal obstructions were simulated by enlarging the inferior Turbinate geometrically. Numerical simulations with turbulent flow models were implemented using FLUENTS for CFD simulations. RESULTS: In the healthy nose, the main respiratory air stream occurs mainly in the middle of the airway, accompanied by a diffused pattern of turbulent flow on the surface of the nasal mucosa. The peak value of turbulent flow is found in the functional nasal valve region. However, this aerodynamic flow pattern has partially or completely changed in the models with enlarged inferior Turbinate. An inhalation flow rate of 34.8 L/min with a maximum velocity of 5.69 m/s, 7.39 m/s and 11.01 m/s are detected, respectively, in the healthy, moderately and severely obstructed noses. Both total negative pressure and maximum shear stress have increased by more than three and two times, respectively, in severely blocked noses compared to the healthy one. CONCLUSION: Data of this study provide quantitative and quantitative information of the impact of inferior Turbinate hypertrophy on the aerodynamic pattern and physiological functions of nasal airflow. By including the model of turbulent airflow, the results of this experimental study will be more meaningful and useful in predicting the aerodynamic effects of surgical correction of inferior Turbinate hypertrophy.
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Numerical simulation for nasal flow with partial inferior turbinatomy-a turbulent model
2009 International Conference on Biomedical and Pharmaceutical Engineering, 2009Co-Authors: Xiao Bing Chen, Vincent F H Chong, De Yun WangAbstract:Partial Inferior turbinectomy is typically performed for patients suffering from chronic nasal obstruction due to hypertrophy of inferior Turbinates and are refractory to other more conservative treatments In this paper, the effects of the various manner of incision performed on the inferior Turbinates in terms of the resulting nasal air flow pattern were analyzed using computational fluid dynamics (CFD). The three 3D nasal models with partial inferior turbinectomy were reconstructed from the MRI scans of a healthy human subject by simulating the three remaining shapes of inferior Turbinate after the respective Turbinate surgery with the use of the software MIMICS 12.1. Thereafter high resolution 3D volume meshes comprising boundary layer effects and computational domain exterior to the nose were constructed. Numerical simulations were carried out using FLUENTS for CFD simulations. The Reynolds averaged Navier-Stokes equations were solved for the turbulence flow with SST k - ¿ model. The consequences of the various types of Turbinate surgery were compared with the originally healthy nasal model as well as the nasal model with severe nasal obstruction. The velocity streamlines, the total pressure drop through the nasal cavity, and the local wall shear stress distribution were presented. The existence of small vortices, relatively larger local velocity and wall shear stress showed that Turbinate surgery should be carefully planned as it may affect normal local nasal functions.
Stacey T Gray - One of the best experts on this subject based on the ideXlab platform.
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Surgical Management of Turbinate Hypertrophy.
Otolaryngologic Clinics of North America, 2018Co-Authors: Regan W. Bergmark, Stacey T GrayAbstract:: Inferior Turbinate reduction is a common technique used to improve nasal breathing in patients with inferior Turbinate hypertrophy. Subjective nasal breathing improves for the majority of patients with most surgical techniques, but effectiveness often diminishes over time. Inferior Turbinate reduction techniques typically have low complication rates. Empty nose syndrome is a rare complication associated most classically with total or subtotal inferior Turbinate reduction. Most techniques attempt to preserve the Turbinate mucosa for the purposes of preserving normal mucociliary clearance and sensation. Clinical trials comparing inferior Turbinate reduction techniques as well as studies on long-term effectiveness, value, and cost are needed.
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does the timing of middle Turbinate resection influence quality of life outcomes for patients with chronic rhinosinusitis
Otolaryngology-Head and Neck Surgery, 2017Co-Authors: George A Scangas, Aaron K Remenschneider, Benjamin S Bleier, Eric H Holbrook, Stacey T GrayAbstract:ObjectiveTo evaluate the impact of bilateral middle Turbinate resection (BMTR) on patient-reported quality of life following primary and revision endoscopic sinus surgery (ESS) for chronic rhinosinusitis (CRS).Study DesignProspective cohort study.SettingTertiary care center.Subjects and MethodsPatients with CRS who were recruited from 11 otolaryngologic practices completed the Sino-Nasal Outcome Test–22, Chronic Sinusitis Survey, and EuroQol 5-Dimension questionnaires at baseline, as well as 3 and 12 months after ESS. In the primary ESS cohort (n = 406), patients who underwent BMTR (n = 78) at the time of surgery were compared with patients (n = 328) whose middle Turbinates were preserved. In the revision ESS cohort (n = 363), a similar comparison was made between patients who did (n = 64) and did not (n = 299) undergo BMTR.ResultsSino-Nasal Outcome Test–22, Chronic Sinusitis Survey, and EuroQol 5-Dimension scores showed similar improvements for both the Turbinate resection and preservation cohorts at 3 m...
Dov Ophir - One of the best experts on this subject based on the ideXlab platform.
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inferior Turbinate arterial supply histologic analysis and clinical implications
Journal of Otolaryngology, 2005Co-Authors: Tuvia Hadar, Dov Ophir, Eitan Yaniv, Gilead BergerAbstract:OBJECTIVE: To study the arterial architecture of the normal inferior Turbinate. DESIGN: A prospective, nonrandomized, histologic study. MAIN OUTCOME MEASURES: Fourteen samples were removed at autopsy and during septoplasty operations, processed in the usual manner, stained with hematoxylin-eosin, and investigated microscopically. The analysis included data on the number, location within or outside the bone, the mean area, wall thickness, and distance the arteries traverse from the point of entrance into the bone to the point of exit into the soft tissue. RESULTS: One to three arteries enter the inferior Turbinate posteriorly. In 7 of 14 inferior Turbinates (50%), the arteries lie within the bone and in 2 (14%) within the soft tissue, and in 5 (36%), a mixed pattern was observed. The arteries run along a mean of 1.2 +/- 0.49 cm before piercing the bone into the soft tissue and split off to one to six branches. The mean area and the mean wall thickness of the arteries at the entrance into the bone posteriorly were significantly greater than that of the arteries emerging from the bone and entering the soft tissue anteriorly (0.099 +/- 0.056 mm2 vs 0.051 +/- 0.022 mm2 [p < .01] and 0.116 +/- 0.042 mm vs 0.083 +/- 0.031 mm [p < .05], respectively). The inferior mucosal layer lacks major arteries. CONCLUSION: Given the data presented here, the excision of the inferior mucosal layer and the anterior portion of the inferior Turbinate bone distal to the point of arterial exit constitute a relatively low risk for postoperative arterial bleeding.
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histopathology of the inferior Turbinate with compensatory hypertrophy in patients with deviated nasal septum
Laryngoscope, 2000Co-Authors: Gilead Berger, Ilan Hammel, Rachel Berger, Shabtai Avraham, Dov OphirAbstract:Objective: To measure the dimensions, composition, and possible structural and/or histopathological changes of the compensatory hypertrophic inferior Turbinate in patients with deviated nasal septum. Study Design: A prospective, nonrandomized, and morphometric study. Methods: Nineteen patients with deviated nasal septum and compensatory hypertrophy of the inferior Turbinate in the contralateral nasal cavity underwent surgery for correction of nasal obstruction. Patients’ specimens were compared with those of a control group consisting of 10 inferior Turbinates removed at autopsy. Quantitative measurements of the inferior Turbinate histological sections were carried out and included the width of the layers and morphometric calculations of the relative proportions of the soft tissue constituents. Also, qualitative study was performed to detect pathological changes. Results: Of all layers, the inferior Turbinate bone underwent a twofold increase in thickness and manifested the most significant expansion (P <.001), whereas the contribution of the mucosal layers to the inferior Turbinate hypertrophy was modest. The morphometric analysis revealed a larger proportion of venous sinusoids in hypertrophic Turbinates, but the difference was small and statistically insignificant. Qualitative assessment disclosed normal mucosal architecture in all inferior Turbinates with compensatory hypertrophy. Eleven remained intact, while eight disclosed mild to moderate pathological changes. Conclusions: The data gathered in the present study are of importance to the decision-making process regarding Turbinate surgery. The significant bone expansion and the relative minor role played by the mucosal hypertrophy would support the decision to excise the inferior Turbinate
