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Asymptomatic vs symptomatic septal perforations: a computational fluid dynamics examination.

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Nasal septal perforations cause symptoms due to higher wall shear stress and heat flux, not size or location. This finding may guide personalized treatments for nasal septal perforations.

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CT-based modelingcomputational fluid dynamicsnasal airflownasal septal perforationnasal wall shear stress

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Area of Science:

  • Otolaryngology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Nasal septal perforations (NSP) present with variable symptoms, lacking a clear mechanistic explanation.
  • Understanding the factors influencing NSP symptom severity is crucial for effective patient management.

Purpose of the Study:

  • To investigate aerodynamic differences using computational fluid dynamics (CFD) between symptomatic and asymptomatic NSP patients.
  • To identify potential mechanisms, beyond anatomical factors, contributing to NSP symptomology.

Main Methods:

  • Computed tomography (CT)-based CFD analysis was performed on 5 asymptomatic and 15 symptomatic NSP patients.
  • Patient symptom severity was assessed using validated questionnaires and medical history review.
  • Nasal aerodynamics, including wall shear stress (WSS) and heat flux, were quantified.

Main Results:

  • No significant differences were observed in perforation size, nasal resistance, or flow rate shunting.
  • Symptomatic patients exhibited significantly higher WSS and heat flux, particularly at the posterior perforation margin.
  • A WSS threshold of 0.72 Pa demonstrated high sensitivity and specificity in differentiating symptomatic from asymptomatic NSP.

Conclusions:

  • Regional aerodynamic stress, specifically elevated WSS and heat flux, is implicated as the primary mechanism behind NSP symptomology.
  • These findings offer an objective basis for personalized treatment strategies for NSP.
  • CFD analysis provides novel insights into NSP pathophysiology beyond traditional metrics.