Influência do corticóide na cicatrização da anastomose traqueal sob tensão em cães

Abstract

OBJECTIVE: The aim of this study is to analyze the incidence and intensity of stenosis in the anastomotic area, after tracheal resection and under tension anastomosis, with the use of methyl-prednisolone as a prophylactic agent of the tracheal stenosis. The wound healing with and without the use of corticoid was analyzed as well. METHODS: The experimental study was done in 20 mongrel dogs weighing 13± 5 Kg randomly separated into two groups. In group A (n=10) corticoid was not used and in the group B (n=10) it was used methyl-prednisolone IM 10mg/Kg. Under general anesthesia with orotracheal intubation, three tracheal rings were ressected from each animal. The force for approach the trachea extremities was 300 gf. The animals were killed with a letal dosis of anesthetic and KCl after 30 days, when the trachea was ressected in order to measure the internal diameter of the anastomosis using a digital pachymeter. The histological study of the anastomotic zone was done by the HE and Masson trichromic coloration and by a digital system to the quantitative analysis of the histologic data. RESULTS: In the group A (control) it was detected a greater stenosis index than in the B (corticosteroid) one and the difference was significant (p<0,01). The same group B revealed inflammatory reaction significantly less intense than the control (p<0,01). CONCLUSION: The data allow to conclude that the use of methyl-prednisolone in dogs submmited to tracheal resection and under tension anastomosis, contributed to decrease the intensity and frequence of stenosis of the anastomosis and reduced the inflammatory reaction in the healing tissue.