An Animal Model of Tracheal Stenosis Induced by an Endotracheal Segmented Tube

Soo Jin Lim, Sung Won Kim, Kang Dae Lee, Seo Bin Kim, Seok Won Jeon, Chul-Ho Ok, Min Jung Jung, Chi Woo Hwang, Hyoung Shin Lee
2016 Korean Journal of Otorhinolaryngology - Head and Neck Surgery  
and ObjectivesZZVarious methods to induce tracheal stenosis in an animal model have been introduced. However, most methods use non-physiologic mechanical or chemical injury to tracheal mucosa or cartilage. In this study, we sought to develop an animal model of tracheal stenosis using a segmented endotracheal tube. Materials and MethodZZNine New Zealand White Rabbits were included in this feasibility study. A segmented 1.5 cm LEVIN-Tube (16 French) was inserted into tracheal lumen via
more » ... site and fixed with a nylon tape circumferentially tied around the trachea. The tube was removed transorally one week later and the tracheal lumen was observed with bronchoscopy every week. Rabbits were sacrificed two weeks after the tube removal and the trachea was evaluated with histologic image. Three rabbits underwent tracheotomy and closure only to evaluate possible impact of tracheotomy procedure to tracheal stenosis (sham surgery). ResultsZZNone of the 6 rabbits showed significant complications or death during the study. No significant change of tracheal lumen was identified in 3 sham models. The mean grade of stenosis was 57.2±9.9% (range, 43-70%). Histologic image showed thickening and fibrosis of lamina propria with relatively intact tracheal cartilage framework. ConclusionZZWe developed an animal model of tracheal stenosis using a segmented endotracheal tube fixed with a nylon tape. Since this model has similar pathophysiology to prolonged endotracheal intubation, it may be used in various studies related to tracheal stenosis.
doi:10.3342/kjorl-hns.2016.59.8.599 fatcat:fxpkwxqjg5cfxcgkhr3eu7tmqe