Abstract
To test the hypothesis that the development of tracheal stenosis would depend on the extent of tracheal cartilaginous injury, either 90° (n=6) or 180° (n=6) of anterior wall of 4 tracheal rings were cauterized in 12 mongrel dogs using Nd-YAG laser. Beginning at 3 weeks after cauterization, 180° tracheal injury resulted in life-threatening tracheal stenosis whereas 90° injury did not. Gross and microscopic examinations showed that after 180° injury, tracheal stenosis was accompanied by the loss of tracheal cartilage and dense fibrosis. These results indicate that tracheal stenosis depends on the extent of tracheal injury in experimental canine model.
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