Experimental analysis of three methods of bronchial aerostasia - Experimental study on pigs tracheobronchial trees

Abstract

The present paper was aimed to evaluate the efficiency of n-butyl cyanoacrylate and the nylon brassard as methods for occlusion of bronchial stump and the aerostasia maintenance, comparing it with the manual suture technique on an experimental model using pig tracheobronchial trees, submitted to increasing levels of positive intrabrochial pressure. Thirty pigs tracheobronchial trees were used, where eight lobar bronchi from each piece were selected for studying, four of 10 mm and four of 5 mm. Thereafter, the trees and their bronchi were equally distributed into three experimental groups: Suture Group (SG) - manual suture using n 2,0 surgical nylon; Cyanoacrylate Group (CG) - n-butyl Cyanoacrylate and Brassard Group (BG) - nylon brassards. After the bronchial stumps occlusion, the pieces were immersed in water and the hermeticity test was made placing the positive intrabrochial pressure at 30 cm of H2O for five minutes, and then gradually increased to a pressure of 100 cm of H2O. Leaks with a percentage of 1,25% (1/80) were observed on groups SG and BG, when respectively submitted to a pressure at 30 cm of H2O and 100 cm of H2O. There were no leaks in any bronchial stumps on group CG. There were no statistically significant differences among the three treatments. It was concluded that, both the n-butyl Cyanoacrylate such as nylon brassard, as in the manual suture, are effective methods in the implementation and maintenance of bronchial aerostasia.