Objective To discuss the effect of interleukin-17A(IL-17A)and transforming growth factor-β1(TGF-β1)on the benign tracheal stenosis after tracheal injury in experimental dogs.Methods The trachea stenosis model of healthy Beagle dogs was established by burning the middle part of trachea with electric snare under bronchoscopy guidance.A total of 21 dogs were divided into normal group(n=3,receiving normal feeding),molding group(n=12,after airway modeling every 3 dogs were sacrificed each week for 4 weeks),IL-17A suppression group(n=3,receiving Secukinumab after airway modeling),and IL-17A inhibitor+TGF-β1 inhibitor group(n=3,receiving Secukinumab and SB43154 after airway modeling).Bronchoscopy and CT scan were performed once a week,and the stenosis degree was calculated.RT-qPCR,immunohistochemistry,and HE staining of the obtained tracheal tissues were performed.Results Within 1-4 weeks after molding,in module-making dogs the degree of stenosis of the injured trachea gradually increased,and the expressions of ECM-related proteins,TGF-β1 and IL-17A were up-regulated.After treatment with IL-17A inhibitors,the inflammatory infiltration and granulation tissue hyperplasia were reduced and the early tracheal stenosis was improved(P＜0.05).The combination use of IL-17A inhibitor and TGF-β1 inhibitor had a better remission effect(P＜0.05).Conclusion IL-17A and TGF-β1 may synergistically affect the formation of tracheal stenosis.

Objective To discuss the technical points and the clinical application of single wire-guided inverted Y-shaped tracheal stent implantation under general anesthesia in treating complex tracheal diseases. Methods During the period from January 2014 to October 2014 at authors’ hospital, a total of 6 patients with complex tracheal diseases received inverted Y-shaped tracheal stent implantation. The diseases included trachea-pleural fistula(n=1), trachea-esophageal fistula(n=2) and complex tracheal stenosis(n=3). Under general anesthesia and guided by DSA, inverted Y-shaped tracheal stent implantation was carried out in all the 6 patients. The results were analyzed. Results A total of 6 Y-shaped tracheal stents were used in the 6 patients, and single wire-guided implantation technique was employed in all procedures. In one case , the right branch of the Y-shaped tracheal stent was placed in the right upper lobe bronchus by mistake , and in the remaining 5 cases the stent implantation was successfully accomplished with single manipulation. Conclusion Under general anesthesia, Y-shaped tracheal stent implantation can effectively obstruct the trachea-pleural fistula and left main bronchus-esophageal fistula, and it can also quickly and significantly relieve the complex airway stenosis located at the tracheal carina region. This treatment is safe and reliable with satisfactory short-term effect. Moreover, single wire-guided manipulation is technically simpler, easier and faster than dual wire-guided manipulation. Therefore, this technique should be recommended in the clinical practice.