Characteristics of nasal sinus lfow in patients with chronic sinusitis before and after endoscopic sinus surgery / 中国耳鼻咽喉头颈外科

ABSTRACT

[ABSTRACT]OBJECTIVETo evaluate the curative effect of endoscopic sinus surgery from the viewpoint of biomechanics analysis.METHODSWe select one case undergoing nasal endoscopic surgery for chronic sinusitis patients, after half year follow-up and collect preoperative and postoperative spiral CT data to build a numerical model of nasal cavity and paranasal sinuses with computer numerical simulation (CFD) research methods, to explore nasal airflow distribution and flow field characteristics of value changes before and after the operation. Patients undergo subjective assessments nasal obstruction of VAS score, olfactory VAS score, SNOT-20, objective assessment Lund Kennedy score, Lund Mackay score, saccharin test time and acquisition clinical efficacy data to verify the credibility of the analysis method is feasible and the results. RESULTSThe nasal resistance after endoscopic sinus surgery in nasal cavity and paranasal sinuses numerical simulation decreased, middle meatus of nose and nasal air flow velocity decreased, the pressure change slightly;nasal threshold region, middle turbinate head end section in maxillary sinus ostium section, after nearly sieve horizontal cross-section average velocity decreased, nasal airflow for the mucosa of the shear stress reduced. The volume of the nasal cavity and the area of the mucosa was increased, the volume ratio was decreased, the subjective and subjective assessment of the patients was improved, and the objective assessment was lighten.CONCLUSIONAerodynamic rules are presented through the calculation of numerical simulation of fluid mechanics which is invisible before. Better understanding of changes in the nasal airflow distribution and the changes of flow field characteristics can be useful to establish nasal endoscopic surgery in numerical analysis of offshore platform,which provides a new research tool for the understanding of the pathophysiology of chronic sinusitis by endoscopic sinus surgery.